But I understand there are a lot of hardware/software configurations out there and there can also be different behaviours.
Tell me about it - I've recently updated my Atheros WLAN card drivers to the latest Win7/Vista version, and it seems to have finally got rid of most of the 100-200ms 'stolen time' glitches I was getting.....it's only taken them several years and the Win7 launch to come up with decent drivers....aargh
Pinpointing such issues is pita, but can be done easialy with disabling / removing some HW and then checking driver side behavior with Google.
France