We recently added Multiboard which addresses lag on larger jams - if such jams are on Multiboard.

I think that's just bad device issue, I mean some optimizations could POSSIBLY be made but at the end of the day it's gonna really take a toll on your device to load a canvas and if your on an artjam that's gonna REALLY take a toll because of multiple people drawing on multiple layers so it will have to do a lot of stuff in the background to do everything.