there have been many threads about "lag" and "meter stutter"...some are convinced the problem is with WGT servers, others feel just as strongly the problem is on the players PC.
the one underlying consistency is that no one has yet articulated any proof, just speculation...many of the players voicing their concern often add "it seems better today", or "it seems worse lately"...there is a theme of random chaoticness.
the one element i've yet to see discussed is the likely affect of internet hacking....i trust you all are running a firewall...a firewall will block on average 10-15 hack attempts per MINUTE....i use zone alarm pro...if you do as well, just look at your daily log file in windows/internet logs and to your likely surprise you will see the astonishing frequency of uninvited attempts to "raid" your system via your internet connection....internet hacks could easily be the answer to the "random chaoticness" experienced by many...some hack attempts are more malicious than others, and different firewalls handle these hacks in their own way.....zone alarm pro will write to the log file for each attempt....there is no way for you to say "hey all you hacks, back off while i hit this shot".
advice: turn off all firewall event logging...DO NOT TURN OFF YOUR FIREWALL.
other advice: turn off as many automatic update processes as you can, including windows updates...i run windows updates manually every 2 weeks or so, then turn it back off....browsers like firefox install with defaults to check for updates INCLUDING updates for add-ons...java has an auto update scheduler it runs, etc.
in short, if your computer decides it needs to do something in the middle of your shot, thats life...the best you can do is disable as much as you can to increase the probability of an uninterupted shot.