Poor performance

[a-Rahmati]

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Hello,

When I open a CSV file it takes a while to open it and uses about the whole of my CPU. I don't know if it's a problem or OK.

It's a short clip that shows delay and CPU:

https://user-images.githubusercontent.com/52320192/181823873-33d8cc75-c414-4ded-b957-8a5d197c62ca.mp4

My PC Information:

Thanks