Hi, I does not agree with You, because my servers runs with 20..150 threads, because lower number of threads makes for somebody infinity waiting and Zope under load responding very slow (with external database access). After increasing threads, response under load is more quickly and more paralel users should access to the web. ----- Original Message ----- From: "Sours, Kevin" <KSours@carsdirect.com> My experience is that increasing the number of threads past 4 does absolutely nothing to assist performance. Multi threads will help with the occasional long running request, but if its more than occasional then the thread list will eventually clog up no matter how many threads you have (and the more threads you have, the more they fight over the processor). The server sounds beefy, but since Zope is only going to be using one of those four cores, that might be deceptive. Kevin