DavidR
2
What is you OS and firewall ?
Have (or did) you have another AV installed in this system, if so what and how did you get rid of it ?
What other security based software do you have that might have an effect, e.g. SpySweeper, Spyware Doctor, PrevX, WinPatrol, Windows Defender, ProcessGuard, etc. ?
There is obviously something going on if as you say it has only been happening for about a week. The web shield is a strange beast, but it either works or it doesn’t it shouldn’t suffer any inconsistent performance of now its working now its not.
Do you use any P2P application/s ?
What are you doing when this slowdown occurs ?