Its a common thing to find your rig running slower than before.
You have to wait for a while every time when importing or loading files from your hard drive.
One of the common causes of this situation is low disk space.

So,how to find largest files on Mac?
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#1.

How to find biggest files on Mac:
How To Check Storage On Mac: 5 Ways Available.
#2.
#3.
Of course, yes.
you could use the third-party tools to find large files Mac automatically.
How To View And Sort Google Drive Files By Size Easily?