So when I use C-c C-c (slime-interrupt) to try to interrupt a long-running computation in SLIME it sometimes takes a really long time (order 10-60 seconds) before the debugger pops up. I've also noticed that if I do something that generates an error that will contain a lot of output (such as saying (boundp *y*) instead of (boundp '*y*) when *y* is list of several thousand standard-objects) then it also takes a really long time for the debugger to come up. I'm running Allegro 6.2 on GNU/Linux. Haven't had a chance to try this out in other Lisps but thought I'd throw it out there in case anyone has seen a similar thing or has any ideas how to speed things up.
-Peter