Firefox under-performs when displaying the British Railway Station Openings web page (http://www.thetrainline.com/british-railway-stations/index.html). The webpage is adding / position hundreds of position:absolute <li> elements based on a timeline, which can be dragged. Simply playing the timeline is resulting in firefox on the verge of freezing while the dot-appearing-animation isn't played. If you drag the timeline, things are even worse. Interestingly, if you try to inspect any of the <li> dots, it'll freeze firefox and will take +/- 10 sec for the CSS rules to show up.
Hmm. Playing this looks fine. Dragging is a bit slow, though in all browsers I have on hand. This is on Mac, with a nightly. Mathieu, are you on Linux? Using what build?
Boris, yes, I was on Linux when reporting this bug, using yesterday's nightly build. I've since then switched to a windows 7 machine and, using the latest mozilla-central tinderbox build, see the same slowness / freezing. Video card is Nvidia. For the record, it's working without slow-downs on chromium linux / windows.
Boris, are you in a position to confirm issue is affecting more than a single soul by testing it on a windows or linux machine? :)
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