cpu performance lowers to half when rstudio is not in foreground

RStudio IDE
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Using an I9-12900KS intel cpu, 128gb ram, Asus Z690 mainboard. Originally Win 10 then upgraded to Win 11 hoping to fix problem.

RStudio 2022.12.0+353 "Elsbeth Geranium" Release (7d165dcfc1b6d300eb247738db2c7076234f6ef0, 2022-12-03) for Windows
Mozilla/5.0 (Windows NT 10.0; Win64; x64) AppleWebKit/537.36 (KHTML, like Gecko) RStudio/2022.12.0+353 Chrome/102.0.5005.167 Electron/19.1.3 Safari/537.36

When I run heavy computational tasks and keep the application in the foreground, everything is great, performance is as expected, cpu load is high, fans are whirring. As soon as I switch to a different application (while waiting for the comp. task), cpu usage drops to half and performance is similarly reduced. It stays like this until I switch back to the computational app, when performance increases again.

I've tried adjusting processor scheduling to support background processes, updating drivers, updating windows, and monitoring the process priority in task manager. This occurs when I use the rstudio jobs feature, or just run something normally.

Ideas appreciated!

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Update: if i disable the efficiency cores of my processor, the problem goes away - but then I'm left with less performance and efficiency

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