The new system could also cause battery drain, which means that your Mac will run out of battery faster than before. You can try Cleaner One Pro, which is one of the best cleaning and optimizing apps for Mac OS. – Consider using a third-party software to help optimize the overall performance of your Mac. – Disable Spotlight Search when your Mac is slow. – Use Activity Monitor to quit processes or close unnecessary applications. Uncheck some login items to boost up speed. – Go to System Preferences – Users & Groups – Login Items. Sluggishness is pretty common for old devices. This is also the case for macOS 11 Big Sur since it could lag your Mac and make it super hot. The new system may not always meet your expectations. Poor Performance When Using macOS Big Sur macOS Big Sur freezing & running slow Go to System Preferences and select Dock & Menu Bar.Click on Login Options and switch OFF the “ Show fast user switching menu as…” option.Go to System Preferences – Users & Groups.If that doesn’t solve the problem, follow these steps: Solution: When you can’t see the menu bar after installing Big Sur, try to restart your Mac. If your Mac gets stuck during the macOS Big Sur installation, you can try to reboot your Mac in Safe Mode.Īpple Menu bar disappeared in macOS 11 Big Sur.If the Mac turns to sleep mode while installing, you can adjust Energy Saver settings with System Preferences.If your Mac is not on the list above, you need to reinstall macOS or downgrade the macOS to Catalina.Here are all the devices that can run macOS 11 Big Sur: Check the storage of your Mac and make sure there is enough space.įirst things first, please make sure that macOS 11 is compatible with your Mac.Delete the partially-downloaded MacOS Big Sur file and restart your Mac if you encounter some problems during downloading.Check your Internet connection and make sure your network is stable.Cancel the download, then restart your Mac.You may also consider if it’s because there isn’t enough space to save the macOS 11, since it has a large size of over 12 GB. One possible reason is that the developer ID of this software is invalid, and you will need to try another description file.
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