I am not sure which "flashing" problem you are talking about here. If you are talking about refreshing objects then I have a few quick suggestions:

if it's a repeated movement use $mw->repeat() function wish short timeouts (like 100ms) and have your routine move the object(s) a little bit at a time.

Try not to move EVERYTHING. Move only the things that in your scope of view.

Put more RAM into your computer.

I hope this helps. If you have any more questions, feel free to drop me a line.