Re: Need help with PWM laser control in Mach3
You will always have lag in changing laser power with S parameter.
Mach3 is not ment to work with lasers. Somewhere should be a thread in which @Tweakie explained how he dealt with laser (might be on NFS forum? Can't remember, was long time ago).
Anyway, as you are using parallel port, you could try GRBL controller (Arduino based) connected to your drivers.
This video shows GRBL in action.
https://www.youtube.com/watch?v=P7El-Vc4RBg
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