[Next] Framerate fluctuation and camera stuttering on Linux

Before 3ba48ba4:

After 3ba48ba4:

Not terribly noticeable, but I can definitely feel the difference when playing them back to back (especially at/near 35fps).

There's also this strange issue where the camera stutters every couple seconds while turning:

It only happens at 35fps though - setting the cap to anything else will cause it to go away.

Tested on Debian 12 x64.