How to Fix the Most Common macOS 11 Big Sur Issues

Common issues with simple fixes

If you've recently updated to macOS Big Sur and you've discover some problems with it, there are numerous ways of fixing the most common issues surrounding the latest macOS. It's important to know what the problem is exactly before tackling the solutions, so here's how to fix the most common macOS 11 Big Sur issues. 

Why Is macOS Big Sur Not Working?

If macOS Big Sur doesn't appear to be working correctly, this can be for multiple reasons. Some of the issues can be comparatively minor, but others can be more significant. Here's a look at the most common reasons why macOS Big Sur isn't working.

  • You're low on storage space. If your hard drive is low on space, it can cause problems with Big Sur running correctly and efficiently. Remove unnecessary files from your hard drive to free up more room.
  • Your Mac needs rebooting. Macs are very stable, but they sometimes need rebooting to correct issues with the operating system.
  • Your Mac isn't compatible. The vast majority of currently operational Macs should be compatible with macOS Big Sur, but if your system is ancient, it may not run at all.
  • You're using outdated apps. macOS Big Sur doesn't support 32-bit apps, so if you're trying to use an older app, it may no longer work with this operating system. Check for a 64-bit update instead. 

How to Fix Common macOS 11 Big Sur Issues

MacOS 11 Big Sur is generally a very reliable operating system for Macs, but some common issues have emerged since its launch. Here's a look at how to fix the most common problems that occur with Big Sur. 

  1. Restart your Mac. Restarting your Mac can solve the vast majority of issues, so this should always be the first fix to try.

  2. Update your software. Update Big Sur and all apps to get the latest updates that should be most reliable.

  3. Give it time. Many issues can be a matter of Big Sur needing to settle after first being installed. Issues such as noisy fans, degraded battery performance, and speed issues are often rectified after the first day or so of using the operating system.

  4. Fix mouse issues with this command. If your mouse is no longer working with macOS Big Sur, go to ~/Library/Preferences/ > delete com.apple.AppleMultitouchMouse.plist and com.apple.driver.AppleBluetoothMultitouch.mouse.plist to correct the issue.

  5. Fix Bluetooth issues. If your Bluetooth devices aren't fully working with Big Sur, you may need to delete a file. Go to ~/Library/Preferences/ and delete com.apple.Bluetooth.plist before restarting your Mac and reconnecting existing devices.

  6. Reset your PRAM. If you continue to have issues with battery drain or degraded performance, try resetting your Mac's PRAM or NVRAM to correct the issue.

Are There Any Issues With Mac Big Sur?

Apple released Big Sur in November 2020 and since then has been relatively reliable for the vast majority of Mac systems. Considered the most stable macOS version so far, there aren't any significant issues with Mac Big Sur, but it's worth backing up your Mac before upgrading to it to be safe from any potential unexpected problems.

Will Big Sur Slow Down My Mac?

When first updating to Big Sur, your Mac's performance can seem briefly degraded. Here's a brief overview of why that may seem the case.

  • Your Mac needs to re-optimize. When installing a new operating system, macOS needs time to optimize files and general performance. Performance improvements work in the background and should be noticeable after a day or so of use.
  • Your apps may need to be optimized. If your Mac uses the Apple M1 chip, you may be using apps not yet optimized for it. Check for software updates to get the fastest performance. 
  • Your battery needs time to adjust. Battery life may seem lower at first while your Mac adjusts to the new operating system. Like with performance boosts, this should settle down in time. 

Should I Update My Mac to Big Sur? 

As the latest macOS, it's essential to update your Mac to Big Sur. By doing so, you receive the latest security updates and stability improvements that mean you gain a superior experience. The update is entirely free, so there's nothing to lose other than spending some time waiting for the update to install. 

FAQ
  • How do I install macOS Big Sur?

    To install macOS Big Sur if you're currently running macOS Mojave or later, go to  Apple menu > System Preferences and select Software Update. Or, navigate to the App Store macOS Big Sur page and click Get. For older operating systems, update the macOS by going to Apple menu > App Store and clicking Updates.

  • What Macs can run macOS Big Sur?

    Most Macs from 2015 or later will be compatible with macOS Big Sur. According to Apple, Big Sur-compatible Macs include MacBook (2015 or later), MacBook Air (2013 or later), MacBook Pro (Late 2013 or later), Mac mini (2014 or later), iMac (2014 or later), iMac Pro (2017 or later), and Mac Pro (2013 or later).

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