
In case this trick doesn't work, back up as much data as possible, reformat the disk and reinstall macOS. If Disk Utility reports “The underlying task reported failure”, try to repair the disk or partition again. If Disk Utility says the disk appears to be OK or has been repaired, you are good to go. Click the “First Aid” button, and then “Run”.You'll see the available disk listed in the sidebar.Select “Disk Utility” in the “macOS Utilities” screen, then click “Continue”.
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The problem with this feature, however, is that in the long term it could lead to performance issues as each new window requires more and more system resources, first to draw and then to maintain. MacOS includes design features that are easy on the eye, such as transparent windows. The explanation is pretty simple: Spotlight is hard at work re-indexing the hard drive for use, as is the Photos app, which will scour your Mac to index and scan all photos for available info and faces. After the first restart you'll likely hear your Mac's fans are whirring loudly and the machine is not performing as usual. Things are different if you have recently updated to macOS Sierra. You can solve this by closing apps you don't use. But the most common cause of Mac slowdown is when there are simply too many apps open.
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Sometimes we forget to read the system requirements of apps we download and there are cases when an app requires a different processor or graphics card than the ones your Mac has. If your Mac is slower than usual despite running the latest system version, macOS Sierra, then there are a number of potential causes that can be checked to speed it up again, such as disk space, apps and background tasks.
