compiz team mailing list archive

[Aleksander Nowodziński <763005@xxxxxxxxxxxxxxxxxx>]

Confirmed. 
The problem occurs with ATI Radeon HD 4250. Everything is really choppy even with sync-to-vblank off and all those fixes enabled in Catalyst Control Center (described above). Tested both on repository-native drivers and 11.5 from the producer's website.

The open driver works very well with compiz+unity. It doesn't support
fast acceleration in games though.

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https://bugs.launchpad.net/bugs/763005

Title:
  Fglrx with Compiz's "Sync to Vblank" makes Unity/Compiz plugins to
  crawl