It’s 11 ply “Birch” (made in China), although I also did some test cuts in some 6 ply factory select grade ply.
Everybody’s build is a little different, so just because one person can get results at a certain speed, doesn’t mean that another person on a different machine can achieve those same results.
My LR3 is heavily modified, with extra thick (0.120”) stainless steel rails, 21mm wide strut braces (6mm wider than stock), additional strut braces, 6mm aluminum XZ plate, 9mm aluminum YZ plate, 5mm 2 ply aluminum struts (2 x 2.5mm), along with a bunch of other mods.
I have also bumped up my stepper amps from 900 to 1050 (SKR Pro) to help prevent skipped steps (the motor temps seem to stay in the 40-45 C range).
Even with all that, 3000 mm/min (50 mm/s) is pushing the upper limits of my machine, at least for this type of cut (I can get much faster in 1/8” MDF, and did my surfacing at 6000 mm/min (100 mm/s) with a very thin DOC of 0.2mm).
With the plywood (1/4” 2 flute w/ 6.5mm DOC), I had to bump up the router speed to level 5 of 6, otherwise the router would stall (causing skipped steps as well). Even then, the router and the machine seemed to be struggling in a few spots, while in other spots it seemed to hum right along.