There is a bug in Mach3 dealing with sub-second settings so if you’re doing that, you might want to read this post for how to address it by changing Mach3 to use milliseconds.
Down in that thread (post # 26) I’ve posted a customized version of the Sheetcam post-processor for Mach 3 so that you can specify sub-second settings and they’ll work with Mach 3 so you can have half-second pierce delays for instance.
If you haven’t gotten to where the Mach 3 bug is affecting you, just file this away for when you do. No need to complicate things for you yet 