It works swiftly in 5.1.7 and drags to a crawl in 6.0.9 on XP machines. I suspect the only reason Win 7 machines work is the speed of the processor overcomes the faulty programming. I hope the programmers at Amazing Charts figure it out soon. I am not against upgrading to Win 7 if I need to, but I really don't think XP is the problem. Why would 5.1.7 work so well and fast and 6.0.9 tank - it's got to be an Amaz charts software issue.
I do believe it is an AC problem. I went back and noted that there is a pause in 5.1.6 with Rxs and presumptive diagnosis lookup as well, it just isn't as severe. This is in 2.4-2.8 P4 machines.
My dual cores (1.8) run 6.0.9 well but there is still a pause, almost like 5.1.6 in the P4s.
Again, what is really weird is there is no delay if you remote to logmein (whether you are running remotely or at the main computer!!!) Don't have a clue why.