I’m running Firefox 11 on Ubuntu 11.10 running the nvidia-current driver (280.13). Data loading is very slow, and switching between images takes a long time. Attempting the same task using Chromium 17.0.963.79 does not experience the same speed issue. Is there a way to debug slow performance?
Some additional details - When the 3D view is broken out as a separate window, the system becomes nearly unresponsive. The 3D window does not rotate, and the 2D view takes 30+ seconds to switch layers.
Linux i915 driver, I do not have similar experience. One thing you can try is using Firebug and running the profiler, but that will impact performance negatively (firebug likes to stick its grubby fingers into everything).
One thing to keep in mind is Firefox does have a slower javascript engine than Chrome/Chromium. The difference, however, is not so big that I would expect switching between slices to take 30 seconds in FF. I haven’t been able to reproduce this behavior, but I will try a couple more computers this evening.