Hello,
I can observe that having too much fps isn't ideal, since some item boosts give too much height, and some jumps seem harder (the item boost against electric barriers such as the last one in A1 in Any).
So here are two questions :
- What is the ideal amount of FPS to have for Any% (required for all tricks to "work" consistently)?
- Is it possible to cap FPS using anything else than the performance settings? If not, what's the best solution to limit my FPS while keeping a stable amount?

Sorry, that this is late. The ideal FPS for any% is probably late 300 to early 400. I just made a AS guide but just follow the AS route for A1 for Trio Bombasticus or TB for short. And remember to go through the purple barrier then item jump on the barrier or the column thing. No FPS capping is allowed through NVIDIA Control panel or anything like that. You can Golden Eye this means to look at textures with your FPS counter on to lower or heighten your total FPS.

Hopefully this helps.