5.0.668 Lagging in a 3D Game

Hi

Just wanted to report extreme lag in a 3D Game while running Avast 5.0.668, (Switching to MSE has cured the lag for now) but i don’t know what shield was causing the lag in Avast at all, could’ve been File System, Webshield or Network Shield, or Behavoir Shield.

Windows 7 64bit here, 2.20ghz AMD Athlon 64 Processor, 4gbs of ram, Nvidia 8600GT Video card, 160gb Maxtor hard drive, Western Digital 500GB slave.

Should i remove MSE fully?

Do have 7 Devices on the network
Most running avast free 5.0.594

Any advice is appreciated what i should do, perhaps if was cause i was running the Pre-release build eariler?