[majewsky]

> I doubt it would help if everyone started drowning developers in bug reports that basically state the obvious.

If the bugreport just reads "it's slow", then of course that's not helpful. However, performance issues as drastic as described above are certainly not normal. I'm using Firefox on Windows, Linux and (up until recently) macOS and never encountered anything remotely like this. So it would certainly be helpful to get detailed traces of that abnormal situation.