Sheets are unbearably slow

Sheets are unbearably slow

I'm doing some extremely simple sheets. Like 2 sheets each with 200 lines and 10 columns and a simple vlookup. ABSOLUTLY can not wait 20 secs to flip between sheets. What's up? anyone else having this trouble? Been this way for about 4 days now. 

Both at work (on an older I5, good internet connection) and at home with a good internet connection and a Ryzen Pro7. 

Other Zoho apps are fine. What's up?

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