Created attachment 8447716 [details] about:support output on Nightly STR: * Open http://gomockingbird.com/, click on 'Try it now'. * Start a project, add multiple items to it, like text boxes, buttons, boxes. * Select multiple such items and move them around by dragging, or simply do other operations on the website which involves multiple moves or dragging around. What happens: The operations are visibly very laggy and don't feel responsive in Nightly. I tried the same website and the same number of objects in a project and tried to interact and it was much much more smoother in Chrome. This probably has to do with the graphics than with the JS perf. What should happen: Performance on Nightly should be good. CC'ing Yoric as he was on the perf team and might know which component this belongs to or whose attention to get here.
You need to log in before you can comment on or make changes to this bug.