Wokring with multiple tab geting everything black or started to hover

I was working with my notes and have to check my all index so I started to open them all at once in differet tabs.

And Suddenly It started to hover and some of my notes get blanks. I have no idea what cause this issue.

As far as I understant it’s happening whenever I open multiple tab like 10 to 12 tabs at once.

I am new and have no idea it’s a bug or I have done something worng.

Please help me.

Additional Details

Kapture 2022-08-31 at 06.23.42