Optimizing Playback on Limited Resources

[Half-Light Agent]

720p playback at 1920 x 1080 full screen lags on a device with integrated video limited to 32MB. In a 720 window, playback is fluent.

There are no BIOS options to increase shared memory. I don't want to install a video card.

SOLUTION (Thanks to Qaq and roozhou.)
Switching the video renderer in the options of the media player to Overlay Mixer solves this.

[roozhou]

What is your integrated video chip? What OS are you running?

[Half-Light Agent]

The video chip is an ATI Radeon x1250, the OS is Windows Embedded Standard 2009 (similar to XP Pro).

[Qaq]

Try:
1) MPC-HC as player. You're able to control everything in this player.
2) ffdshow as video/audio decoders (all processing features should be disabled in ffdshow video). You're able to control everything in these decoders.
3) Overlay mixer or VMR7 windowed as video renderes (in MPC-HC Output settings). These are fastest and easyest renderers.
4) set "Process priority above normal" in MPC-HC options.
5) set display refresh rate to 1:1 to video fps or 2(3):1. Matching RR to video fps is important thing.
6) Check CPU usage while playback. You have to find out what is the bottleneck: CPU or GPU.
7) Disable all useless crap in video driver settings. Driver should work as fast as it possible.

[Half-Light Agent]

Qaq, thank you for the suggestions.
Looking into it.

[roozhou]

Have you tried Overlay Mixer for 720p -> full screen playback?

[Half-Light Agent]

The Overlay Mixer seems to resolve the issue.

Thank you, both.