Confirmed that this happens with fglrx and XGL. this is not a compiz issue.
Users are reporting that intel cards does not have this problem.
I have to reject this bug in compiz.
I'll leave add it to xorg.
** Summary changed:
- Very hi CPU in firefox and gnome-terminal
+ Very hi CPU usage when refreshing a window. radeon driver
** Description changed:
- Open and maximeze a firefox window. Then use the scrolling bar. You will see
the CPU usage goes to 100% soon.
+ Open and maximeze a window. Then use the scrolling bar, go up and down for
some time. You will see the CPU usage goes to 100% soon.
The same thing happens in the console, when using vim and going up or down
with arrows keys.
I'm using the radeon driver with an r300 chip.
+
+ EDIT:
+ this problem is not caused by compiz, but when using compiz the system
becomes very slow!
** Changed in: compiz (Ubuntu)
Sourcepackagename: compiz => xorg
Status: Needs Info => Rejected
** Changed in: xorg (Ubuntu)
Sourcepackagename: xorg => compiz
** Also affects: xorg (Ubuntu)
Importance: Undecided
Status: Unconfirmed
** Changed in: xorg (Ubuntu)
Status: Unconfirmed => Needs Info
--
Very hi CPU usage when refreshing a window. radeon driver
https://launchpad.net/bugs/73473
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