When rendering, for example, a page with a big table, Mozilla becomes unresponsive during the rendering. No toolbar buttons can be pressed, or menus accessed or other browser windows used. Also the browser windows don't update properly (other windows draw over them). Mozilla/5.0 (X11; U; Linux 2.2.16 i586; en-US; m17) Gecko/20000716

Adding perf keyword.

See also mostfrequent bug 17325 "Limit number of incremental reflows".

Comments on bug 17325 say: "Ideally (sorry), we'd do more reflows, not fewer, for big complicated tables, in order to service UI events more often. If a big reflow takes too long away from the event loop, the UI starves." It doesn't seem like the proper solution, why block the UI while reflowing? The UI should never block - otherwise the user might think the browser crashed.

well, all browsers (4.7, ie) do that when takign ups lots of memory, you can't really do this that easily, if at all. yes, mozilla does it more than the others, but that is due to memory bugs, this is not a feature, but is a nessecity. And therefore invalid, as this is optimisation work

makes sense, verifying