Category Archives: macOS High Sierra Problems

Fixes for macOS High Sierra Problems. Days 7-11 After Update

Sorry I was off for a few days. But, here are common fixes to common High Sierra OS problems in the days 7-11 after the update.

  1. Not able to drag and drop files or folders to copy and paste them

This is a weird problem. It is not that macOS High Sierra doesn’t allow you to copy or paste files and folders. It is track pad settings that is actually preventing this from physically registering as a movement! To fix this, simply do the following.

Go to System Preferences -> Trackpad -> Point & Click -> Un-Check the box that says “Force Click and Haptic Feedback”

Disabling this will mean that you will run into weird UI problems elsewhere. You might have to click a few times to make the click register. But, the fix above will fix your copy paste drag drop issues for now. I am 100% sure that Apple will release a patch to fix this Haptic feedback issue.

2. Mac very slow to boot after High Sierra update

If your Mac acts fairly normal except for when it is booting up on High Sierra, it is a problem you may be able to fix very easily. Apply the fix suggested below.

You will need to change your TRIM settings for this.

Go to Terminal.

Once there, copy paste the following command

system_profiler SPSerialATADataType | grep ‘TRIM’

If the response is in the negative (if it says no), type the following.

sudo trimforce enable

If the response is in the positive (if it says yes), type the following

sudo trimforce disable

As you can imagine, this is a shot in the dark fix but some users have told me that both disabling and enabling the TRIM option has allowed their Mac to boot up as normal. TRIM is usually enabled if your Mac runs an SSD. TRIM allows your disk to actively erase blocks of data that are not necessary to your Mac. Sometimes, this process can help while sometimes it actually can prove to be a burden.

Try the fix I suggested to see if your High Sierra slow to boot issues will go away.

3. Is there an update to High Sierra available?

Yes! There is a supplemental out and it was released yesterday. Go to your OS update settings page and you will see the button to quickly install this supplemental update. It has helped a lot of people pick up the pace on their Mac, after the initial install to High Sierra they might have made a few days ago!

4. Mac only runs on WiFi and ignores LAN connection

If you have a solid LAN connection but your Mac is still preferring WiFi over LAN, here’s a tweak that will fix that issue for you.

Go to your Mac’s System Preferences. Network -> Check for the order of networks listed on the right side of the Network window. Is your WiFi listed before your LAN (Ethernet) connection. If it is, you just need to change the priority order. To do that, click on the settings icon or the cogwheel icon at the bottom of the list and use the + and – buttons to manipulate your Ethernet connection to the first place. Click Apply and restart your Mac with the LAN plugged in. This time, your Mac will ignore your WiFi since your LAN is plugged in!

5. Mac freezing when I try to upload a document in any application

This might be an iCloud problem. Temporary disable the iCloud Drive and try your file or folder uploading and it might work just fine. Once you are done uploading the file, enable iCloud again if you need its functionality. Though not very ideal, it will allow you to continue uploads without freezing your Mac. Apple should be releasing a patch for this pretty soon I would think.

6. “The recovery server could not be  contacted.” error

Unfortunately, this is something you can do diddly squat about. It just means that Apple’s servers are super busy. You will just have to wait it out or keep trying multiple times and hope that you get lucky with a forced inclusion in the queue that they seem to be experiencing.

7. Getting the “The IMAP  command UiD Copy (to Trash) failed for the mailbox INBOX with Server Error: UID Copy Command is not valid in this state. Or, what is called the not  able to delete Mac Mail messages from the Server.

If you deleted some Mac Mail messages but see it right back to where it was when you log back into Mac Mail, the following fix might help.

Go to Mail, then Preferences and select the account that is malfunctioning with the unable to delete messages error. Then, select that account and then go into Mailbox Behaviors. Go to Trash Mailbox. Select On My Mac instead of the default trash location assigned to that particular account.

This apparently seems to be a problem being faced by Yahoo email holders who have their Yahoo mail ID set up on Mac Mail.

7. High Sierra not running apps in full screen mode

If you are usually used to all your apps opening in full screen mode and don’t like the random minimized sized windows High Sierra keeps throwing at you, here’s a simple fix.

Go to System Preferences  and un-check the box that says “Close Windows when quitting an app”. You might still have to maximize your apps once after restarting it, but the problem will go away after that.

That’s all for now. If you have slow performance problems with High Sierra, please read our post on the top 10 fixes to fix a slow High Sierra Mac.

Fixes for macOS High Sierra Problems. Day 5,6 After Update

Here’s a quick roundup of fixes to common problems or issues that macOS High Sierra users are facing in the first weekend after its official launch.

  1. High Sierra installation causing file permission errors, not allowing copy paste files on APFS drive

This seems to be an emerging issue. If you can’t do simple things like copy paste files or folders to locations on your APFS drive, please try changing the permissions as follows.

Go to Finder -> Home -> Choose whichever file you are having trouble with -> Get Info -> Sharing and Permissions -> Click on the lock to unlock it. You might have to enter your Apple login and password to do this. Then, to finish off, click on the Action menu and select the option that says “Apple to enclosed items”.

Wait for the progress bar to tell you that the entire process is complete.

You will also have to take an additional manual step to fix your file permissions. Open Terminal and copy paste the following command and press enter.

diskutil resetUserPermissions / `id -u`

Once these two steps are complete, try copying or pasting the file that you were having trouble with and your problems should have gone away.

2. Finder is not responding on High Sierra

If Finder seems unresponsive, slow or even frozen and you have just upgraded to High Sierra, all you might need to do is wait for the problem to go away on its own. High Sierra might be indexing your hard disk, temporarily disabling many of Finder’s functionalities until the index is complete. If not for indexing, the problem could also be caused by iCloud drive sync that you may have turned on.

3. Mouse pointer changing size now and then in High Sierra

A mouse pointer that changes in size all of a sudden can be extremely distracting and annoying. Thankfully, the fix is very simple. Just go to your High Sierra system preferences, accessibility and then display. Once there, if High Sierra for whatever reason has enabled “Shake Mouse Pointer” option. If yes, disable it and your mouse pointer won’t change sizes anymore.

If it is enabled, what is happening is that your Mac is animating your pointer with a large size every time you quickly move your mouse, like when  you resume work or move all the way across the screen.

4. Conversation view in High Sierra Mail problems

If you are seeing a bunch of black block  frames instead of important mail conversations that you want to read, the fix is simple. Go to system preferences in your Mac. Once there, go to displays, color tab and then look for the calibrate button. Run through the calibration process which will require you to do a few simple mouse clicks. Once the calibration is successfully complete, you will no longer see black spaces when you open Apple Mail.

This will also fix black frame problems that you haven’t seen with other apps, but probably exist without you knowing.

5. Black login screen upon start of High Sierra

This occurs if you have enabled the “Show a message” option upon restart. High Sierra will surely fix the issue in a patch or the next release. Until then, go to System Preferences, security and privacy, general and then disable the “Show a message” option.

You will no longer face the black screen login issue.

5. High Sierra download is interrupted at 19.9 MB.

If you have tried download High Sierra installation files several time but are always seeing the process being aborted at 19.9 MB, here’s a workaround.

Go to system preferences, security and privacy and then file vault and turn it off. Then, download High Sierra like you always do. But, do not click on the continue button.

Instead, install it to a blank formatted macOS Extended Journal with an untitled name. Then open terminal and copy paste the following command.

sudo /Applications/Install\ macOS\ High\ –volume /Volumes/Untitled –applicationpath /Applications/Install\ macOS\ High\ –nointeraction &&say Done

High Sierra will now fully download, without any issues.

6. Time Machine not working on APFS format

TIme Machine unfortunately doesn’t work on an APFS format, though it will successfully convert to that format. For it to work, you need to reformat to a format other than APFS.

Fixes for macOS High Sierra Problems. Day 4 After Update

Here is a quick roundup of fixes for macOS High Sierra installation and performance issues, on the 4th day after High Sierra’s official release.

  1. High Sierra stuck in an endless installation loop, with error code 0

If you are getting a error 0 and are stuck with an installation process that has been on the same screen for over half an hour, you are going to have to abort the current High Sierra installation process.

The funny thing is that your Mac will tell you to “Quit the installer” without presenting you with a button that you can actually click! The only workaround to fix this error code 0 is to force shut down your Mac. Create a High Sierra installer on a USB drive. When your Mac restarts, make it restart from your USB installer. Before installing, format what will be your macOS partition and do a full install instead of a repair job.

It will install High Sierra.

2. Battery % not displaying properly in macOS High Sierra

If your battery icon is showing you all kinds of % figures, like 100% when you have barely charged your Mac or figures that are not at all accurate, you might need to do some system controller resets to fix the issue. First, check your Mac’s accurate battery status by going into battery settings. There, you should be able to see the real battery charge %.

First thing you can do is reset the SMC. Look up Apple’s website on how to do this.

Second thing you can do to fix the issue is restart your Mac in safe mode and see if it gives you an errors or warnings. If there are none, restart in normal mode again and check if the battery issue still persists.

If the problem doesn’t go away after even a safe mode restart, try to see if the issue is user specific. Try creating a guest user account or have one of your family members log into their account on the same Mac, to see if the problem still exists. If the problem exists in all the user accounts that you try, try resetting the SMC again. If it is user specific, please call Apple support for a query as we don’t know what might be causing a battery issue that is applicable only to your user account.

3. macOS HIgh Sierra installation stuck with “Retrying…/InstallESDDmg.pkg after 1 failure(s)” error.

GitHub has a fantastic step by step tutorial with background information to help you fix this error. Go to to follow it and get out of this problem.

As a reminder, please check our post on the top 10 fixes for High Sierra slow problems. It has been helping out a lot of people get their Mac up to speed, if it slowed down right after the recent  upgrade they did!

Fixes for macOS High Sierra Problems. Day 3 After Update

Day 3 after the official macOS High Sierra launch has gone by. High Sierra has seen very slow adoption rates so far. It probably is because most of the changes that High Sierra brings to the table have to do with the backend as opposed to fancy OS elements like UI. But, if you are still on the fence  about High Sierra, we recommend that you make the upgrade. The Apple File System, the new iCloud features and improved Siri all do a quite but great job of improving your Mac performance and experience.

Anyways, coming back to our fixes for common problems related to High Sierra installation and usage, here is a roundup of popular fixes to common problems.

  1. Not able to disable infrared volume control from external speaker

If your external speakers are still controlling your Mac’s volume levels, even though you have disabled Infrared control, here’s what you can do to fix the issue.

Go to Terminal and copy paste the following command (without the quoted) and press enter.

“sudo kextunload /System/Library/Extensions/AppleIRController.kext”

Ignore the error message it throws out at you. Check your Mac’s volume control now and it will have native control, without requiring use of an infrared device that was controlling it before.

2. Dilemma about formatting secondary hard disk with Apple’s new APFS format

Just don’t do it. Apple doesn’t recommend it even. Leave your external drives to the format they are already using. Though your secondary hard drive can be formatted with APFS format, it will result in colossal hang times when you access data from it.

3. Concerns about how well SMB works on High Sierra

The few users that have tried it at Apple Discussions seemed to suggest that all is well with SMB and High Sierra. You will have to do small things like authorize a driver for the Sonnnet 10G and you will also have to disable client signing. But otherwise, SMB works well and there is no reason why you should hold off your High Sierra update if only SMB is your concern.

4. Error code 118 when you try to convert HDD to APFS format

If you have tried the right click “Convert to APFS” option but have been presented with the 118 error code, here’s a workaround. Please note that this method will require you to erase the disk that you want converted to APFS. So back up data is you want to retain it!

Go to disk utility. Click on View and then select Show all devices. Select the target drive and click on the Erase option that you see at the top. Now, format the target disk with Mac OS Extended – Jounaled, GUID format. Then, try the convert to APFS and it should work this time.

5. Mac on High Sierra won’t come back from sleep

To fix this issue that is affecting some High Sierra users, simply reset the SMC controller. Look up Apple’s website for quick instructions on how to carry out a SMC reset. Don’t worry. It won’t delete user data. The most you will have to do is reset time and some basic system preferences, after the restart.

That’s it for today. We will be back with the Day 4 update tomorrow!

Fixes for macOS High Sierra Problems. Day 2 After Update

It is now about 36 hours past the official macOS High Sierra update. Yesterday, we updated our site with common issues faced with installation of High Sierra. We also touched upon some problems with not being able to see mail preferences after an upgrade to High Sierra.

Here is today’s round up of fixes for macOS High Sierra problems that users are facing. Once again, please note that these are fixes that are collated or curated from Apple’s discussion forums, where a lot of people ask questions and a lot of answers are posted. We only pick the answers that are tried and tested to work.

  1. Can’t find the “All My Files” option on Finder’s Sidebar anymore

This wasn’t exactly a very popular feature in older OS versions like Sierra or El Capitan. But, if you found it useful for whatever reason, you are going to miss it in High Sierra, as it just isn’t available.

Though you can’t have it back like before, there is a workaround.

To employ the workaround, find and click select your home folder. Press the command and F keys. Once the criteria box opens up, click on the + sign. Delete the first criteria that you see and only leave the option that says ‘Any of the following are true”. Also, make sure that you select and chance the first Kind to document. If there are more tweaks, carry it out in the next few line items. Save and and you are good to go. You will have what is essentially a “All My Files” search option in Finder.

2. iCloud Contacts not syncing on High Sierra

This can be a huge problem if you are doing a lot of contact related work on your phone, then your Mac and then back on your phone etc. Thankfully, the fix is very simple to have your contacts syncing smoothly on High Sierra.

Simply go to your User’s Library folder, then containers and then find a file called “”. Delete that file.

Restart your Mac for good measure and attempt contact syncing again. iCloud contacts should work for you this time.

3. Some websites don’t have volume when I use Safari running on macOS High Sierra

This is another very quick fix. The mute website problem occurs because of some Safari settings being changed back to default after upgrade to High Sierra. Go to preferences, select the auto-play tab and check the box that says “Allow All Autoplay”.

Visit the website again once you are done with this and sound media should be working like normal.

4. Not able to copy files larger than 4 GB onto Fat 32 Format external drives

This seems to be a bug and we are pretty sure Apple will put out a patch soon. But, if you have to copy a file larger than 4 GB in the meanwhile, use an app called Sync Folders Pro. It will take a little leg work to set up a sync between your source drive and your external hard drive, but it will get the job done for you. For now at least. Once Apple’s patch rolls out, you can simply drag and drop using High Sierra like any other OS.

5. Not  able to merge multiple PDFs to preview

If you need to merge multiple PDFs into one PDF, you can’t do it like before, like for example how you did it with Sierra.

High Sierra requires you to now select all your target pages, copy it to the clipboard (Command + c), then use Command + N. Then, do the same from file 2, 3 or how many ever files you have. Save the new file to create a merged PDF!

That’s it for day 2. Remember to check out to learn how to fix High Sierra performance issues, if you feel your Mac has slowed down after the update to the latest OS.

Fixes for macOS High Sierra Problems. Day 1 After Update

macOS High Sierra is officially out. It’s only been less than 24 hours but there are some problems already. We will discuss issues to those problems. Please note that these fixes are mostly obtained after reading through Apple Discussion forums. Of course, some fixes are fixes that we found ourselves, through our trysts with macOS High Sierra.

Common macOS High Sierra problems.

  1. Not able to install High Sierra due to “Recovery server could not be contacted issue”

This is a rather easy fix. If you are getting a whole bunch of mumbo jumbo errors with lines about errors related to BridgeOS, you can still install macOS High Sierra by using the Internet Recovery Mode. Though you will have to restart your Mac, Internet Recovery Mode will let you complete the High Sierra installation that you so eagerly started!

2.  Not able to install High Sierra due to “An error occurred while verifying firmware” issue.

To fix this installation problem, all you have to do is log into your Mac in recovery mode. Repair all your disks using first aid. If you are short on time, try repairing just the partition where you want to install your macOS High Sierra copy on. Then, restart your macOS High Sierra installation and you should be good to go!

3. Not able to see Mail Preferences after updating to High Sierra

If you go to your Mail Preferences window and just see blank space, without all the usual tabs for Genera, Account, Junk Mail etc, all you have to do is delete mail plist preference files.

To find the right plist file to delete, first close Mail. Then, go to Finder and then to the Library folder, then Containers folder, then folder, then data folder, then library folder and then preferences folder. Once there, delete the file.

Now, restart your Mail program and you should now be able to see your Mac Mail preferences, like you did before with Sierra or El Capitan.

That’s it for now folks. Of course, it has only been a few hours and we are sure there are going to be a ton of issues very soon, with fixes alongside. We will keep updating fixes as and when we see problems and solutions to fix those problems.

If you aren’t exactly having a problem with installation or bugs but are just experiencing slow performance issues after upgrading to macOS High Sierra, we highly recommend our latest and very sought after post that provides the top 10 Fixes for slow High Sierra problems. You can read the ten tips here.

MacOS High Sierra Slow? Top 10 Fixes

Top 10 Ways to Speed Up macOS High Sierra

Has upgrading to macOS High Sierra brought you nothing but performance issues? These top 10 fixes, listed in an order of priority of effectiveness, will have your Mac back up and running at normal speeds in no time. Try these fixes in order to eliminate macOS High Sierra slow problems in a matter of minutes.

1.Let your hard drive breathe!

Not a lot of people know this but your Mac’s processor very often relies on hard disk space to compute various things. In other words, it’s not just your Mac’s RAM that acts as memory. Your Mac’s hard disk is like secondary RAM to your Mac. When your hard drive is full or even just choked up to 80%, your Mac is invariably going to run slowly.

In fact, beyond a certain point where your hard drive is full of too much data, your Mac can begin to crawl or even freeze up for no reason, while you are doing something as simple as typing out a Pages document.

The fix however is very easy. All you have to do is free up a lot of data by either deleting unwanted data or by moving out data to an external hard drive or a partition on which your mac OS High Sierra isn’t installed on.

Clean My Mac 3If you want to do this the super easy way, all you have to do is use a software like CleanMyMac 3, which will clean up massive amounts of space like 40 or 50 GB in a matter of minutes, with just a couple of clicks of your mouse!

Try CleanMyMac 3 and you will be surprised at how quickly and easily it makes your macOS High Sierra work fast and smooth.

Clean My Mac 3 is available for a FREE download here.

2. Leverage macOS High Sierra’s Optimize Storage Function

This is kind of what CleanMyMac 3 does, but not just as effectively. But, the good thing is that this is rolled out by Apple as an in built feature into High Sierra. All you have to do is turn it on.

macOS High Sierra Optimize Storage

Optimize storage on your hard disk using High Sierra’s inbuilt storage optimization. Not as effective as CMM 3 but good to have!

By turning on the Optimize checkbox, your Mac will constantly clean up free hard disk space where it can, in small bits and pieces. It will remove certain data from your Mac’s local hard drive and upload it to your iTunes Cloud account. This way, you don’t lose the data and you also don’t valuable hard disk space on your Mac.

You will always receive notifications about which file is being deleted, moved to the Cloud. Since you are notified, you can always control what is being moved or deleted. Using this function will mostly prompt your Mac to get rid of things like old files that you haven’t touched in a very long time, mail attachments, fonts that you never use and certain other system files that are just redundant on your Mac.


macOS High Sierra is out! The brand new OS designed to make your Mac more reliable, responsive and capable should be giving you a fantastic new experience. The all new OS uses state of the art 64 bit architecture to organize how your data is stored and retrieved, to give you a smooth user experience. Video streaming is particularly improvised in this version of macOS High Sierra, since your Mac will now use the full power of your graphics processor as opposed to tapping into your core processor’s capabilities.

But, what good are all these promises if your Mac is just facing issues after your recent upgrade to macOS Sierra. Your Mac should be faster, more responsive and more fluid, not slower! If you are facing the dreaded macOS High Sierra slow problem just after your upgrade to the new OS, here are simple but sure shot solutions that will help you fix your slow and unresponsive Mac. Applying these tips will ensure that your Mac runs butter smooth, like it is supposed to, when you have just upgraded to a brand new OS.

Let’s now continue this tutorial with the remaining 8 tips that will allow you to troubleshoot your new OS problems. Please remember that these tips are given out to you in order of priority that factors ease of applying the fix. In other words, the tips at the beginning are the easiest to carry out, to fix your macOS High Sierra Slow.

Top 10 Fixes to Fix macOS High Sierra slow problems continues below!


3. Shut down rogue apps

Sometimes, it could be that your Mac just needs a break from apps that have malfunctioned. If your Mac is running very slowly after you have run certain applications, simply shutting down such applications can help you speed up your Mac.

To see if any applications have gone rogue or are taking up too much space, do a quick check on your Mac’s Activity Monitor. It is really easy to do.

Just go to Applications -> Utilities -> Activity Monitor. Once in there, you will see a populated list of all the apps that are running on your Mac, with details on how much CPU and RAM resources they are taking up, like shown below.

Check Activity Monitor in Utilities to find rogue apps that are making your Mac crawl

If you see anything taking up a significant amount of CPU or memory resources, it probably means that the app has crashed, frozen or is holding down your Mac in an unfair manner. If you find such rogue apps, simply shut them down and your Mac might spring back to life. This is actually one of the most powerful ways to fix macOS High Sierra slow problems. Of course, please remember that shutting down such apps through Activity Monitor will mean that you might lose unsaved data that you had created through the app. So, take a moment before you force quit any app, especially if the content you were creating took a lot of time to create. If you do not wish to force quit a rogue app, your only other choice is to stop doing everything else on your Mac, giving it all the resources it needs to make that rogue app work properly, so you can save your work and then shut it down.

4. Scale Back High Sierra UI Fanciness

This isn’t really an ideal tip to follow. After all, when you install a new OS like High Sierra, you want to see what UI improvements have been made. You want to enjoy things like animations and what not when you close and open windows. But, sometimes, Apple’s UI tweaks to a new OS don’t work well until they roll out an update to their newly launched OS.

If there’s a bug in the way the UI eye candy works, it can tremendously slow down your Mac.

macOS High Sierra reduce motion and transparency

Reducing High Sierra’s UI fanciness can fix your slow performance issues

To turn off the UI eye candy, all you have to do is go to system settings and then go to accessibility and then the Display option. Once there, reduce as many UI eye candy features as possible. Some of the features you can disable are by reducing motion and transparency.

5. Don’t Choke Your Mac with a Ton of Startup Items

Whether you know it or not, you might be making your Mac take on a ton of work as it starts up after a restart or a fresh start. In case you did not know, you can make your Mac automatically load programs in the background as soon as it starts up. While this offers convenience, having too many items in this startup or login list can lead to macOS High Sierra slow login and boot times.

Since any app can be called up in a few seconds, it is unnecessary to have any items in your login list at all. You must at the most have only 1 or 2 items in this list. Delete all the other apps from the login list and your Mac will thank you for it.

High Sierra Login Items Editing to Speed Up Mac Login

Edit your High Sierra’s login list to help High Sierra load and boot faster

This is a fix that you must particularly try if your Mac and High Sierra is particularly slow when you just start it up. To edit your login list, go to System Preferences, then Users and Groups, find your user and then go to Login Items. Once there, use the minus sign to remove apps that you don’t need to start up as you start your Mac and High Sierra. Once again, try to keep this list down to 0, 1 or just 2 items at the most. Edit this list and restart your Mac and you will be amazed at how quickly it boots.

6. Consider upgrading to an SSD

If you are using a Mac that can run High Sierra, it probably means that you already have an SSD on your Mac. If not, you must seriously consider this upgrade that can make a world of a difference to your Mac’s speed, especially with High Sierra.

SSD for your Mac to speed up High Sierra

Install a SSD on your Mac to let High Sierra run much faster than it does now.

A SSD is many times faster than a traditional hard drive as it does not have any moving parts. It is completely digital. In a regular hard disk, the disk spins and a spindle retrieves data from various locations on the hard disk. All the spinning takes time and resources that make it slow. On a SSD however, information is retrieved in a fraction of the time it takes to retrieve information from a traditional hard disk, resulting in much faster operating times.

Remember, when you get an SSD, you must install your macOS High Sierra on the SSD. Try to get an SSD with as much capacity as possible as the more free disk space you have on your SSD, the faster your Mac will be.

If you can afford a hardware upgrade, this is one of the best ways to address macOS High Sierra slow speed issues.

7. Make use of High Sierra’s iCloud Storage Function

Ever since Sierra came out, Apple has given you an option where you can send your Mac’s data that you only occasionally use to the iCloud. Besides helping you free up space on your Mac’s hard drive, storing data on your iCloud allows you to access it anywhere, even from other Apple devices, as long as you have the same iTunes account.

iCloud storage in High Sierra

Enabling iCloud Storage in High Sierra allows for free disk space that can speed up the macOS

Just be a little wary of iCloud storage’s algorithm that sometimes decides that some files on your Mac are just not necessary to store anymore. In such cases, it will just go ahead and delete these files. This may not work for you. In such cases, you can still use iCloud by performing backups on external hard drives as well. This will require you to carry out an extra step of course.

8. Reset System Controllers like SMC and PRAM

Resetting your Mac’s SMC or PRAM are called soft resets. What this means is that no user or important system data is deleted. These resets instead just reset the connections between your Mac’s software and hardware, which can sometimes surprisingly speed up your Mac.

For example, an SMC reset will fix any battery issues that you have on your Mac notebook, if such issues pertain to your High Sierra’s organization or monitoring of your battery. On the other hand, a PRAM reset will fix issues pertaining to High Sierra’s screen resolution, boot issues and battery charge cycle issues.

As you can imagine, a fix to any of these issues can help you overcome performance issues with your Mac running on High Sierra.

Please see this Apple resource for detailed instructions on how to reset SMC and PRAM on your Mac desktop or notebook.

9. Download and Install Patches to High Sierra, if Available

Sometimes, a macOS High Sierra slow issue will not have anything to do with your Mac at all. It could just be that the OS has bugs that prevent your Mac from running normally. In such cases, all you can do is download the patches or updates that Apple releases, to fix these kinds of issues.

To check if there are patches available, simply head over to the App store and check for software updates for High Sierra. There might not be one always available but if it is, it will almost always fix performance issues for you.

It might also be a good idea to turn on automatic updates for your Mac’s OS. You will still be prompted before an upgrade but you will atleast immediately know when an update or patch is available, via a prompt on your Mac’s screen.

10. Maybe your Mac can’t run High Sierra!

Sometimes, it could just be that you just jumped the gun when it came to installing macOS High Sierra when your Mac just isn’t capable of running the new OS.

If your Mac is not among the models mentioned below, you will unfortunately have to roll back to an older Mac OS like Sierra, El Capitan or even older OS versions, depending on your Mac’s age.

Macs that are compatible with macOS High Sierra

iMac – Only iMacs bought in late 2009 or after

MacBook – Only MacBooks bought in late 2009 or after

Mac Pro – Only Mac Pros bought in 2010 or after

Mac Mini – Only Mac Minis bought in 2010 or after

MacBook Air – Only MacBook Airs bought in 2010 or after

MacBook Pro – Only MacBook Pros bought in 2010 or after

To conclude this post on helping you fix your slow performance issues on your Mac running High Sierra, we will say that using CleanMyMac 3, upgrading to an SSD and freeing up disk space on your Mac’s hard drive will all give you guaranteed speed up results.

The other tips may or may not work, depending on whether it is an issue in the first place. But, in any case, a combination of these 10 tips should allow you to fix your macOS High Sierra slow issues one way or another.