I have just installed an 12.10 64bit installation. Same picture, running kdbg via ssh x forward is significantly slower than with a 10.04 32 or 64 bit installation. I tested agains a (new) 32 bit installation of 10.04 on a Pentium 4 old PC, which still performs significantly better than 12.04 and 12.10
I came across 2 things here: 1- it might be pure network performance plus the fact that simple X applications like ddd probably (i don't know) use less network ressources than QT applications do (more effects)?. 2- Is there any debugging you can propose, or maybe X benchmark / QT benchmark, that could help to find out where the time gets lost 3- visually, the slow performance shows in some kind of 'rolling down' effect of the application when starting it up (kdbg is our choice for this test). when using 10.04 the window just pops up. With 12.04 and 12.10 you first see the top line, then the rest of the window is rolling down, just slow enough that our eye can see it rolling. Still, using the sliders and menues gives that feeling of a slow machine. 4- we didn't change Network or hardware between 10.04 and 12.04 upgrade on the 64 bit machine in question. We even tried with a directly connected remote X client via ssh, physically only one net cable between them, no other network connections established. There must be a problem somewhere ... 5- other people have seen similar, but maybe never experienced enough trouble: https://answers.launchpad.net/ubuntu/+source/xorg/+question/213691 -- You received this bug notification because you are a member of Ubuntu Bugs, which is subscribed to Ubuntu. https://bugs.launchpad.net/bugs/1077965 Title: qt4 applications over X forward run slower than with Ubuntu 10.04 LTS To manage notifications about this bug go to: https://bugs.launchpad.net/ubuntu/+source/qt4-x11/+bug/1077965/+subscriptions -- ubuntu-bugs mailing list [email protected] https://lists.ubuntu.com/mailman/listinfo/ubuntu-bugs
