least CPU intensive codec for playback???

[Apnoea]

Hi-

I've been playing with an old P166 (that's pre-pentium2 for all you younguns!) and trying to get it to achieve a decent playback framerate. Unfortunately for the best part I haven't been doing too well...

Does anybody know which of the major (and indeed any other) codecs that are useful for films are the least CPU intensive during playback?
It seems obvious that the better the compression the more CPU time is needed to decode each frame... shame that.

Div5 seems to have done the best so far, tweaking the playback to decrease quality. If i were encoding, intending playback for this machine alone, I suppose I'd be dropping the resolution and probably even the framerate too...

Does dropping the bit-depth help?
Any other tweaks people know of?
DMA enabled, all other software killed, fresh boot etc.
Most efficient player??? I'd imagine that it's mostly down to the codec though...

Cheers-
Apnoea

[khp]

If you haven't already ..

Enable overlay extended mode, and yuv extended mode, in the divx5 decoder.

And don't encode with B-frames, gmc, q-pel.

[Batman]

divx 3.11 alpha is the least cpu intensive codec, I have found.
Use GDIVX. Reduce colour to 16 bit and desktop areat o 640x480. Do not run background applications.