Not sure how to word this but I'll try......I am using Mach 3 to run a servo driven burning machine and it just started stopping briefly or hesetating after an arc move.
   It doesn't stop the program, but pauses for a fraction of a second. At 150 ipm it is quite jerky. I don't remember changing anything........ But being new at this I can't say for sure!
     Thanks in advance, Steve

Try putting a G64 in the Gcode program

How is it then?

 Thank You for the reply, I discoverd that I han "No Angular Discrimination" unchecked.
 We are happy now!  Thanks Steve