The 30 frame walk cycle AVI file I used was 1.71MB (exported from Poser using a 320×240 format, Microsoft AVI codec). I substituted the AVI image into the “stage lights” emitter (Alan Oct-Nov 2000 library) then tweaked it til I got it the way I wanted (I finally got the figures to stop popping in and out). Now I have an army of these guys marching at slightly different syncronizations (so not in “lock step” and looks more realistic). I can let it run in PI3 as long as I want and seem to have no problem with slowing.
However, I tried a longer(19MB) Poser AVI file of a knight swinging a sword, and PI3 ground to screeching halt, so smaller is difinitely better when using AVI files. I haven’t yet tried using multiple AVI files within the same PI3 shot, but I’m still experimenting.