I'm having some really weird issues getting performance out of games with AVI files, specifically Ultimate Pinball: Lost Continent

The game runs natively in 640x480 256

I have run significantly more advanced games in DOSBox, but this simple game stutters terribly in general, and any time the game loads an AVI file, it slows to a stop.

I also tried just loading the AVI files off the C drive from wihin DOSBox. It's a small file, but it practially stalls the system.

I've tried various S3_VGA drivers and I cant figure out a system to get it AVIs, or games running them to work. I'm attaching my current DOSBOX.conf. If I can't get it working, I might try PCEM