Close All Apps You Aren’t Using
By default, your Mac should be able to handle all the apps you normally have open; it doesn’t matter if you’re using them or not. Unfortunately, if the app is really demanding or you have too many apps, your Mac might end up slowing down temporarily.
To avoid this issue, you can go to the Activity Monitor like we just showed you or close all the apps that are too demanding. If you don’t want that, you can go to all your open apps and start closing them one by one.
There are several ways to do this, but the fastest way is to go to the app and press Command + Q to completely close the app. If there are some apps that refuse to close, you open the Apple Menu and click Force Quit.
You’ll see a list of all your open apps. Click the app you want to close and select Force Quit.