Sorry for the mess, here we go again: Thanks for your quick response.
For this run here, I only had Gnome + Terminal (bash+top only) + Firefox (blogger only) running. At first, on loading the page, firefox-bin went to about 50%, then this: ··PID·USER······PR··NI··VIRT··RES··SHR·S·%CPU·%MEM····TIME+··COMMAND ·8691·root······20···0·70908··14m·6932·R·78.8··3.8···0:11.12·Xorg ·9034·fr········20···0··174m··47m··23m·S··7.6·12.6···0:08.12·firefox-bin Then Xorg started going from about 50% to about 90% while firefox-bin remained constant: ··PID·USER······PR··NI··VIRT··RES··SHR·S·%CPU·%MEM····TIME+··COMMAND ·8691·root······20···0·71644··14m·7184·R·89.8··3.9···0:37.35·Xorg ·9034·fr········20···0··175m··48m··23m·S··8.0·12.8···0:12.59·firefox-bin This is with https://www.blogger.com/start on the visible tab. As soon as I open another tab in Firefox, e.g. by typing Ctrl-T to open a new tab, the CPU is immediately freed from the heavy Xorg load and I can work normally: ··PID·USER······PR··NI··VIRT··RES··SHR·S·%CPU·%MEM····TIME+··COMMAND ·9034·fr········20···0··176m··49m··23m·S··8.0·13.1···0:35.62·firefox-bin ·8691·root······20···0·71900··15m·7352·S··4.0··4.0···1:42.45·Xorg -- (hardy, xorg, compiz) xorg becoming temporarily unresponsive after latest compiz upgrade https://bugs.launchpad.net/bugs/180055 You received this bug notification because you are a member of Ubuntu Bugs, which is the bug contact for Ubuntu. -- ubuntu-bugs mailing list ubuntu-bugs@lists.ubuntu.com https://lists.ubuntu.com/mailman/listinfo/ubuntu-bugs