You should clear your Mac's cache periodically
to optimize its performance.
Doing this deletes media files,
such as images and text files
that it gathers from sites you visit
and applications that you run.
With the finder window open, press shift + command + G.
Or from the top menu bar,
click "Go," then click "Go to Folder."
Enter the following command into the search box:
~/Library/Caches.
You can copy and paste this command
from the description below.
This will bring you to the folder
that contains all your Mac's cached files.
Now select the folders by pressing command + A.
Or from the top menu bar, click "Edit,"
then click "Select All."
Now delete all the selected folders
by pressing command + delete.
Or from the top menu bar, click "File,"
then click "Move to Trash."