Well today was super fun! I ran @johnboiles GRbl on my Rambo…stupidly easy, no wire swapping laser is good to go…Top notch work John!!! I ran vector burns at more than 300mm/s no issues other than my laser ran out of power to make a mark, corners always looked great no over or under burn. The big thing is Raster burns were stable at 81mm/s!! The other crazy find is even at 150mm/s when it did hiccup a bit you could not tell in the burn, you could hear the motors change sound but the burn stayed perfect. In Marlin you got visible glitches.
Raster - Raster Grbl Test on the MPCNC - YouTube 150mm/s
Vector - Vector Grbl Test on the MPCNC - YouTube 250mm/s
So I need to figure out a SKR Pro GRBL version. I want to see what 32bit can do or maybe that is not the bottleneck??