App Store not working or too slow? Here’s how you fix it!

App Store may sometimes not work appropriately or be too slow.

Not everybody knows, though, that there's a quick fix for these problems.

1. A download doesn't get started or resumed:  Quit the App Store app, go to Terminal and enter the following command:  open $TMPDIR../C/ Afterward, open com.apple.appstore and remove all the files located in this folder. 
2.  Downloads are too slow or abort: Open Keychain Access (Applications/Utilities) and select Preferences. In the Certificates tab, under Certificate Revocation List, change the settings from Best Attempt (default) to Off. Your current download will be faster from now on.  Note: this setting is insecure, allowing to download files without checking their certificates, so you want to switch back to the defaults after completing your download.