My hardware info:

  CPU:   AMD Phenom Quad Core 9600 (2.3GHz) AM2+
  Motherboard:   ECS A780GM-A AMD 780G

With the "no xv" workaround, videos play just fine.  All 4 CPU cores run
at about 25% load.

Without the workaround, CPU put a big load on 1 core, while the other 3
cores remain mostly idle.  The load on this one core is proportional to
the playback window size.  Enlarging the window increases the load.
Once the load reaches 100% and I enlarge the window further, the video
starts to skip or the system crashes.

-- 
System hangs with desktop-effects on during video playback
https://bugs.launchpad.net/bugs/333027
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