You don’t need to own a DICE for that highspeed firstlayer. What about a Prusa tuned to the max doing the same? Have a look: https://youtu.be/Ps303pOF8Ng
Amazing work!
What nozzle size, and how long is the melt zone required to avoid under-extrusion and filament stripping? I experimented with high speed a while back, but concluded that something like the E3D Volcano is required to go faster than usual through a 0.4 nozzle at normal layer height.