Has anyone else noticed FPS drops or slow downs?

I began to notice it when i got to some lava.. don't know if that has any connection to the problem.

A shame it makes the game almost unplayable for me because it give me motion sickness because it's a great game :)

Yup, slowdown in the lava area as well. Not too bad for me but makes it a little jerky when scrolling.

I didn't get noticeable fps drops but some of the jerkiness and sound glitches when getting certain upgrades or transitioning from the world map to a local one.

Unfortunately I just got to the Diablo-like part and slowdown made it entirely unplayable, trying to move and attack with something like 3-5 seconds of lag before it happened.