Everything began to lag on UBUNTU, how to fix it?

Question

linux

The whole system began to lag sharply - widgets take a long time to start

1. All browsers lag - even the video does not load at 1080 (everything worked before)
2. I haven’t downloaded anything before, etc., I just used the command - nvidia-smi 3. I
also noticed that the function " show applications "starts without animation
(It seems like I remembered this happened after a system update)

THE ENTIRE DEKSTOP STARTED LAG, ANY ACTION!

Even without a clue what to do

Answer 1

EVERYTHING WAS REPAIRED BY PREINSTALLING THE DRIVER

Answer 2

Take everything down.
Everything.
There is nothing left to save.