Slowdown with irule and large data group?

Thanks for your reply Denny. Sadly, a naming convention for pools will not work for us as we have many urls that are not alike, but are part of the same "group" and are balanced to the same web servers in order to properly take advantage of the local caching. The last resort would be for us give up that advantage of the local caching if the processing for it under load causes more slowdown than it gains and just balance evenly between the webservers based on source ip or the like. However, I would like to first figure how to best take advantage of our current architecture with BigIP and give that a try before heading down another route.