Michael, to find the cause of high CPU usage you need a profiler, not a
debugger.
Most profilers need special code compiled in to your application, but Valgrind
has a plugin Callgrind that works with any existing binary (as do all valgrind
plugins):
http://valgrind.org/docs/manual/cl-manual.html
Callgrind will give you nice sorted lists of the functions using the
highest CPU. It is not for beginners though. Maybe later I will write a
HOWTO on profiling compiz with callgrind so more people can give it a go
and provide some nice rich data on compiz performance.
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https://bugs.launchpad.net/bugs/888039
Title:
Gradual degradation in desktop performance.
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