This bug was finally resolved with updates to sdl, used by all the games
I saw it in. When I first changed repos to move to Utopic Unicorn, a new
SDL package returned both Critter and Scorched3d to full performance.
Then another update reverted some change, and performance fell right
back to where it had been. Finally a 3ed update fixed it again,
hopefully for good.
libsdl1.2debian_1.2.15-8ubuntu2_amd64.deb brought the original fix
libsdl1.2debian_1.2.15-9ubuntu1_amd64.deb rolled it back
libsdl1.2debian_1.2.15-9ubuntu2_amd64.deb fixed it for good, had this changelog
entry:
libsdl1.2 (1.2.15-9ubuntu2) utopic; urgency=medium
* Restore accidentally-clobbered changes from 1.2.15-8ubuntu2.
[ Timo Jyrinki ]
* debian/patches/sdl-check-for-SDL_VIDEO_X11_BACKINGSTORE.patch:
- Restore old backingstore behavior to prevent tearing
(LP: #1280665)
Had to revert HUNDREDS of packages one at a time to find this! Any kind of
anti-tearing behavior can be resource intensive, I've never had tearing
problems in games with r600 but do need to use vsync with video players.
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https://bugs.launchpad.net/bugs/1293314
Title:
Severe performance regression with xserver 1.15
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