'How to improve mysql database performance on google cloud?

Can anyone help me? My problem is in reading and writing, there is the problem. I already use SSD disk. I have 20BG in space and 9GB used of the 20GB.

Memory never reaches half occupancy, processor too.

I have peaks of the day when almost no one can access the system, it is extremely slow and I saw that the problem seems to be in the reading and writing

Video see the video

tks



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