I don't fully understand why that might happen if you had source IP persistence on, that cookie would make it faster. If the user's source IP was changing in the middle of their session (AOL, megaproxy, corp LB proxy) and the BIG-IP was load balancing instead of persisting, then cookie persistence would make sure the user goes back to the same server and the server doesn't have to look the user up again. When you activated the HTTP profile, did you also change the virtual to type Standard from Performance Layer4 or were you already on standard?
Nimbostratus
