Any update on gigabit network traffic slowdown by NIS2010?

Just upgraded to NIS2010 v. 17.5.0.127, seems to be up-to-the-minute.

Tested vs. annoying NAS slowdown; despite "full trust" assignment to both NAS & switch for test purposes, NIS is attenuating transfer speeds.  Contrary to what I've read (to the effect that "disabling" is ineffective & "uninstalling" is essential to mitigate slowdown), I find that disabling both NIS-AV + NIS-FW radically improves transfer speeds on (large) file dumps, no incremental benefit accrues from uninstall over "disable" so long as both functions are so disabled.

 

System is Vista64, Raid5 4-drive NAS, all Cat6, gigabit switch between targets.  Issue remains if NAS is directly attached (ethernet) to PC so long as NIS AV & FW are enabled.  Problem is demonstrably bidirectional.

 

Thanks