using chrism-install-branch and caring much less than I have in my past life - I have run ab against Plone in Zope2.6. It appears that Zope2.6 is significantly slower than Zope2.5.1. I ran ab from my Windows XP machine on a local network. 300Mhz Celeron w/ 256MB RAM Zope2.5.1 Python 2.1.3 ab -n 10 http://mysite/plone 1.30 Requests per second Zope2.6 Python 2.1.3 ab -n 10 http://mysite/plone 0.87 Requests per second I ran the tests a few times and picked the highest number. In both 2.5.1 and 2.6 the "target cache" setting is higher than 4000 (and I am only requesting the first plone page). Also Andy McKay did some quick benchmarks using a simplified PageTemplate skin and he is getting ugly results (he is migrating from DTML to PageTempaltes). cheers, ~runyaga