User Agent: Mozilla/5.0 (X11; Ubuntu; Linux x86_64; rv:16.0) Gecko/20100101 Firefox/16.0 Build ID: 20121006022900 Steps to reproduce: Tried to drag an element with jQuery Ui Draggable in FF 16 Actual results: In Firefox 16 the jQuery Ui Draggable functionality is very slow. If you try to drag any element, the element updates its position only every few seconds. My OS is Ubuntu 12.04.1. You can test this here: http://jqueryui.com/draggable/
I don't see any difference with FF16 on Win 7. Could you try with a new profile, please? (don't import anything) https://support.mozilla.org/en-US/kb/profile-manager-create-and-remove-firefox-profiles
A new profile does not solve the problem. It seems that the problem is a linux problem.
wfm with Mozilla/5.0 (Windows NT 6.1; WOW64; rv:19.0) Gecko/19.0 Firefox/19.0 SeaMonkey/2.16a1 and it seems to be ok with Firefox16 on Ubuntu 12.04.1LTS. I can only test over VNC and the system is a slow Intel Atom.
I can't reproduce the bug on the latest Nightly on Ubuntu and neither on Firefox 16 on Windows 7 64bit.
I see this error too. Just upgraded to Ubuntu 12.04 and got FF 16.0.2. Don't remember my previous FF version. All works, but not smooth, as earlier. The difference between "then" and "now" is big. My drag-based application behaves awfully.
@Dmitry: Do you user Gnome or KDE as desktop environment? I use KDE. On the computer of a friend (same OS and desktop) there is the same performance problem. I hope this bug will be fixed.
I have the same performance issue using jquery ui draggable, I am on linux mint - firefox 18.0, xfce 4.10... I remember having the same problem with earlier versions (17 for sure and probably even 16)...
@Michal: if you think it's a regression since FF16/17, could you try to find a potential regression range with mozregression, please? See http://harthur.github.com/mozregression/ (try on the whole year 2012, like --good=2012-01-01 --bad=2013-01-01)
Reporter, is it sill an issue on your side?