PSP2 Slow Problem

Hi guys i've a problem with PSP2 (not infinity, i should try that too), i don't know why, when i'm going on net games, my game just goes lot slower than in the single player, do you know how to fix this?
Even if i host the problem is the same, and even if i lost alone, we tried several things; maybe it's just my graphic settings, i don't know.
Anyway i'm using the last version of ppsspp and i've already activated the depth option for psp2.

Frame rate is lowered (20FPS I believe) in multiplayer, so it will always feel choppy.

This is fixed in Infinity.