Just to add data to the bug report, on my 4-core (8 threads) i7 setup,
with ATI graphics and google chrome, after 5 days my $ top shows:

top - 13:01:41 up 5 days, 19:52,  2 users,  load average: 1.13, 1.30, 1.38
Tasks: 292 total,   2 running, 289 sleeping,   0 stopped,   1 zombie
Cpu(s): 11.0%us,  5.3%sy,  0.0%ni, 83.1%id,  0.0%wa,  0.0%hi,  0.5%si,  0.0%st
Mem:   9200596k total,  8530880k used,   669716k free,   147956k buffers
Swap:        0k total,        0k used,        0k free,  3719712k cached

  PID USER      PR  NI  VIRT  RES  SHR S %CPU %MEM    TIME+  COMMAND            
                                                              
 2358 chris     20   0 1676m 152m  26m S   44  1.7   1064:58 compiz             
                                                              
 3054 chris     20   0 2014m 451m  17m S   17  5.0 248:06.63 chrome             
                                                              
 1156 root      20   0  663m 259m 184m S   12  2.9 251:51.52 Xorg               
                                                              
 2945 chris     20   0  957m 167m 7292 S    9  1.9 136:01.27 chrome 

Note how much CPU time compiz has used...

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https://bugs.launchpad.net/bugs/803943

Title:
  compiz consuming a lot of cpu

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