Mock race without other load: 60.0 game fps and 75 slow frames in 74 s with the clamp, 58.2 fps and
376 without (nice -15 alone), 58.8 fps and 286 with neither: the game thread's 11 to 14 ms of logic
a frame wants the Frame's one 1024-capacity core. sched_setattr needs no privilege for this.
KARTFRAME_UCLAMP=0 leaves the clamps alone; the "thread priority:" lines show what was set.
Co-Authored-By: Claude Opus 5.5 <noreply@anthropic.com>