Comment 56 for bug 779717

Reading the comments twice, the original issue was indicator-multiload causing a leak in compiz and it seems fixed. At least no one did complain about it recently and I don't see indicator-multiload causing some leak in compiz (feel free to speak up if you see something though).

However what most people see is a leak in the indicator-multiload process itself (comments 46 to 54), maybe this should be investigated as part of bug 1049282 instead:
https://bugs.launchpad.net/ubuntu/+source/indicator-multiload/+bug/1049282