Follow the update sequence
An initial notice discussed monitoring FPS with F2 and applying an external cap. Version 0.9.1 introduced a game-side limit; 0.9.2 revised it and added an off switch. Newer instructions take priority.
Keep a short test log
Record the symptom, setting, frame behavior and whether the result repeats. If it persists, share reproducible steps in the official support thread. This page does not claim to fix every performance problem.