I did some searches on Google and asked a few experts about this issue.

I thought this delay might be related to the previous warning that told me my startup disk was full. Instead, when I click on an app to use, it only opens after five seconds. There was a bit of delay when I open a new application. However, it seems my Mac ran slower than before.

At that moment, I ignored the warning and keep using my Mac as I often do. It said: Your startup disk is full, and suggested me to delete some files to make more space available on the disk. Last month, when I turn my Mac on, there was a warning appeared on my screen. The story is I’m using a MacBook Pro 15-inch Mid 2010 and still don’t have any plans to upgrade to a higher model. Well, you will find out soon enough after reading this Clean My Mac 3 review – from me. Have you ever heard about Clean My Mac 3? Should you buy it and use to clean up your Mac?