I was running 5.003 - fine..
I installed on friday the patch 5.004 and here we we go:
Squid is almost unusable and works for 1 out of 5 queries.
Memory goes up the roof (768Mb) and the swap kicks-in after 5 hours.
CPU goes up.
I disabled Virus protection for all services but it does not help. Eventually the firewall will go down when the swap is full.
Cheers.