scrolling the patcher window causes all gui elements to redraw, no real way around this. if you need a full featured GUI and stutter free rendering, my advice is to separate your video player from your GUI and load two instances of Max, passing messages over udpsend/receive.

ok ! no solutions to set high level priority to a main window ?

With jitter, it's sometime very confuse for me. I'm looking for best performance, and i can't find the good way and method to have a video fps stable without interactions.

No solution to have a high prioryity sheduler to selected objects ? Like jit.word or jit.movie ?