I've been running 6.3r1-1 (build 13563) for months and the CPU and Swap had never crested 3% utilization. Last night I upgraded to 6.4R1 (build 14063) and the CPU/SWAP shot up to 26% and has been at that rate for the last 8 hours. I've had only a max of 12 users running netconnect.
I've also noticed that now the Signed-in Users[Device] and the Signed-In Users[Root] are always the same number although there is never more than 1 root user logged in.
Attached is a screenshot of the user count and the CPU/swap utilzation before and after the upgrade that happened about midnight.