Ok, then this is most likely a very short segment program. Maybe someone else can chime in here with the required settings for you to make in Mach2.
I am guessing that the rough motion has to do with the number of lines of "lookahead" which gives your controller a chance to issue a blended path, instead of stopping at the end of every segment. Believe me, if your cnc does stop at the end of every movement, it gets really jittery, and is very hard on the mechanical components especially if the feedrate is fairly decent.
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