I usually use chrome and Firefox for browsing. I also open many tabs (around 40 in both some times).
The problem I have occurs when I resume the PC after having suspended it: It takes from 2 to 5 minutes sometimes to just get back normally.
Does this have to do with memory usage not properly resuming? Is it a bug in Chrome/Firefox or Ubuntu itself?
Note that I just upgraded from 10.10 to 11.10 and I was having the problem on both releases, which makes me guess that it has to do with Ubuntu not resuming well if some memory-heavy apps were running before the suspend occured.