With TOT (r27373) the Web Inspector is hanging a lot just opening the Console or even just bringing up the Inspector and nothing else.
Created attachment 16988 [details] Sample 1
Created attachment 16989 [details] Sample 2
THe inspector was working fine earlier today when r27359 was landed. So I suspect this was a recent regression, r27359-r27373.
Rolling back to r27372 makes the hang go away. So this was caused by r27373.
I can't reproduce this bug with TOT.
Tim can't repro either, anymore. Closing.