crib_Is there any input lag or any undesirable effect of having a low fps cap? Which is better, fluctuating b/w 250 and 350 or hard cap of 250/300?
The only input lag I'm familiar with is the increased time to frame, which has diminishing returns for increased FPS. So, if you render faster, obviously you're going to see the result of your actions faster on the screen or reflected within the frame dependent input polling code.
I would say fluctuating FPS is worse. But keep in mind that frame pacing isn't affected by fps_max, so some issues will still exist even with a stable FPS from fps_max.