You should force macOS to quit any processes that are using too many processors resources: Use a Monitoring Appīut whenever you feel that your Mac is running slow, just launch Activity Monitor (pro tip: type “activity monitor” in Spotlight), and under the CPU tab check which apps are using a high level of CPU resources. Of course, it's also recommended to have a clean desktop because a cluttered desktop with hundreds of files of different sizes will slow down your Mac. Check the boxes “Reduce motion” and “Reduce transparency”.Select “Display” from the left set of menu items.Launch System Preferences and hit Accessibility.Turning these features off is especially useful for improving the performance of your Mac if you are constantly using lots of apps or have a lot of open windows.

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. Clean 500MB of Junk for Free Reduce Transparency