Adobe Premiere Pro slow performance when app in focus

[Eugene5C5B]

So I have this weird issue in Adobe Premiere Pro where the performance is extremely sluggish.  Whether it be switching between tools, previewing video, adding graphics, etc...

The weird thing is if I Alt-Tab out of Premiere so that its not the application in focus it runs fine.  For example if I start previewing a video its laggy/stuttering.  While its playing Alt-Tab so its not in focus and the preview plays fine.  

It shouldn't be the hardware as the PC its pretty beefy spec-wise

AMD Ryzen 5950X, 32GB Ram, Samsung 980 Pro PCIE4 M.2, Nvidia RTX 3090.  Both the CPU and GPU are water cooled so its not a temp or bottleneck issue.

This issue is so confusing.  Also a bit frustrating as it I have to alt-tab, then alt-tab back every time i want to add or change something.

Tried cleaning media cache, setting up proxies, pre-render and no dice.

Any suggestions/help appreciated.

[basil1891 · Accepted solution]

Turn off g-sync in nvidia control panel:

https://community.adobe.com/t5/premiere-pro/choppy-playback-when-premiere-window-is-active-plays-fin...

[Eugene5C5B]

Thank you.   That did the trick.