So, I have been just dealing with this for several years, but it seems that this should not be happening.
When I am running gcode in mach3 lathe through a USB Smooth Stepper, and I am at a feedrate specified in the code, sometimes I want to speed up or slow down the FR. Seems like the FRO in Mach3 would be the thing to do. It works...but takes up to 45 seconds to become implimented. Seems to me it should react much faster. I dont know if its a buffering thing, a SS thing, a delay till a next line of code with a F value...etc. no Idea.
Any thoughts?