For those with slowdown near enemies, look here!

[Thomas]

Just want to point out that you must quit the game exactly when it is sluggish, or else the log will not report anything useful.

Blanel:
Chekcing the log, there is at most 11ms seconds to do the scene updating (the biggest stealer being the physics). This should no amount to some major slowdown since it leaves almost 400ms for the renderering, which should be plenty for a couple of frames. Are you sure this is from when the game is the slowest?