I also get the pulsing to fast. I run it as 25khz I have a 1.2 Ghz processor, it is decitaded to the CNC Router only. Nothing else is running on the computer other than the wireless internet connection.
If I change it to 35khz, it does not say pulsing too fast, but when ever I do anything with the computer ie move mouse so screen saver turns off the machine jumps and looses its place. Now that is a problem.