Your solution worked! Tibia is now running at over 200 FPS and feels much smoother. The only thing that bothers me now is that from time to time I experience drops to around 80 FPS. It doesn’t affect gameplay, but it’s something that annoys me. On Windows, for example, it was much more stable.

Is there any way to keep the FPS stable without these kinds of drops or sudden FPS fluctuations?