[Zope-dev] What's the recommended Zope-Squid configuration?

Hi, I found two HOWTOs on setting up Squid as web cache for Zope. One of them is from http://www.zope.org/Members/htrd/howto/squid In this config, Squid and Zope communicate with each other via ICP. Zope is started with --icp option. No Accelerated HTTP Cache Manager is used (or is it necessary?) The other one is from http://www.zopelabs.com/cookbook/1043965452 This config requires patching of AcceleratedHTTPCacheManager.py (patch provided). Zope does not need --icp option, but Accelerated HTTP Cache Manager is added to communicate with Squid via PURGE method. What's the difference? Which configuration is recommended for performance? Any other recommended config? Many thanks! Regards, Zhi Min