I also have the same problem, and at least mine seem tied to flashplugin-nonfree.
If I remove flashplugin, firefox runs fine under maximum cpu-load. (regardless of if it's nice:d or not) If I have flashplugin installed, firefox is very laggy under max cpu-load, but only if the program that generates cpu uses nice. ./maxcpu contains "while true; do true; done" If I run "./maxcpu" or "nice -n 1 ./maxcpu" then firefox is still quite responsive. If I run "nice ./maxcpu" or "nice -n 19 ./maxcpu" then firefox is unusable, just showing my bookmarks when I click bookmarks from the menu can take like 20s. Tests are run with loads of tabs and junk.. I'd try the old flashplugin-nonfree/edgy (which I think will work nicely) but it doesn't seem to install correctly any more. My current version is 9.0.21.78.2ubuntu1~edgy1 from edgy-backports/multiverse. -- Firefox unresponsive when CPU is occupied 100% with a low priority process https://launchpad.net/bugs/68791 -- ubuntu-bugs mailing list [email protected] https://lists.ubuntu.com/mailman/listinfo/ubuntu-bugs
