[Zope] Profiling / Speed Optimizations

Hi! Is there an easy way to run something like a profiler through my site? The site has grown to a rather big and complex monster. Now I'm trying to do some optimizations. Apart from what I can _see_ (damn, that article is rendering slowly...), I would like to have stats on how time-consuming the different "parts" are. I was thinking of writing a little script that accesses every object in the ZODB and keeps track of the response times. This seems a bit clumsy, though, and reveals only very basic info. Is there something around, zope-specific, or maybe some other tool? Thank you very much in advance, Danny