Fps caps whenever i change window

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Acknowledgement of checking existent issues

• I have checked if my issue has already been reported, and I am certain that my problem has not already been addressed.

What problem did you encounter?

Whenever i join a fps tester, i get 600 fps. when i change my resolution by shifting the tab (moving), or exiting/opening fullscreen, my fps caps to 165 which is my monitor refresh rate.

Roblox Experience link

No response

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I figured out it is only when using open GL