Did you all managed to solve this problem? I’m also load balancing 2 WANs with PCC and having the same problems with browser stalling when FastTrack is on. I’ve managed to solve it but not sure if this is the right way.
What I’ve done is to exclude WAN2 connections from FastTrack.
add action=fasttrack-connection chain=forward connection-mark=!WAN2_conn connection-state=established,related
That’s all I did and it seems to be working. FastTrack is back on and everything is ok so far. CPU usage on my RB2011 is down from 80% to 50% when routing at 60mbps. The WANs are 30mbps each.