I tried to see if I could experience lag running S&T 2011 on my Fujitsu Slate. It has about the CPU power of a netbook and I loaded it with GPS Gate, GPS View, 2 instances of S&T 2011 and a screen capture program. I had to use an unpowered USB hub to connect the S3 and S4 as the slate only has one USB port. I assigned the S3 to GPS Gate and used its ports for GPS View and one instance of S&T; the S4 was connected to the other instance. The computer was certainly taxed but seemed equal to the task.
I took a 40 minute trip with the screen capture program set to 20 seconds. Unfortunately, I was unable to determine anything about lag or the differences of the GPS. From the screenshots, occasionally one was leading slightly and at other times the other but the differences were miniscule. Sometimes the S4 showed more satellites and sometimes the S3.
The difficulty is there are no problem areas for GPS around here except the park this side of Victoria. I didn't want to drive that far just for a test so the worst I saw was 5 satellites and usually 8 or more.
As I pushed the computer hard enough that Win 7 eventually complained, I can no longer suspect lag to be due to this. However, until I can see it, I'll stay out of the discussion!