Roblox Studio is locked to 27 FPS exactly if rendering engine isn't OpenGL

Hi,

As the title says, my FPS is locked to 27 FPS when it is not rendering OpenGL. I’m very confused on why this is happening, as I have a decent computer.
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This is on a blank baseplate, and the issue disappears when testing the game, but reappears when editing in Studio. I’ve tried reinstalling and restarting thousands of times, yet to no avail.

Specs:
GTX 1660 Super
Ryzen 5 7600X
32GB RAM
1TB SATA SSD