Hi everyone, I just thought that I would pass along this tidbit for anyone that might be interested - we just finished figuring out a problem that was causing massive slowdown on our Zope site, as a result of ZODB lock contention... here's what to look out for: I had written an External Method something like: import re def foo(my_re=re.compile(r' ... ')): ... where I had a default argument that used the re module. For reasons that I don't yet understand, every time this External Method was called it registered an attribute change, and was rewritten to the ODB, causing every page view to require a write access. I solved the problem by rewriting my EM to use ts_regex instead - however, it would be nice to know what might have been causing this to happen... Any ideas? --Brian