Requesting guidance re: Audacity 3.6.4, please

Audacity is not running smoothly on my computer. Timeline cursor skitters instead of moving smoothly, All operations are rough. Could someone offer a fix, please?
My imac is late 2014
Big Sur 11.7.10
Audacity 3.6.4
This combination is factors isn’t playing "nice"together…suggestions are most appreciated. Go back to older Audacity?

I get that on Windows …

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