The beat the song is built on is a 2-bar phrase, played through bars 27-29, 31-32 and 35-37, and 13 more places -- 26.3% of every bar the kit plays. That is the spine of it; everything else is what happens around it.
It is played on crash, ride, snare and kick, counted in sixteenth notes. On its own it scores 74 out of 100 -- demanding -- and the thing that decides that is how many notes a second it asks for.
The whole song is 76 out of 100, so the beat is most of what the song asks for. Get it clean and the rest follows.
A part this hard is not learned by playing it slowly and hoping. The room opens it on its simplest reduction -- the timekeeper alone, at 112 BPM -- and adds the notes back over 5 rungs, each with a tempo to reach and a gate to pass before the next.
Tempo goes 112, 134, 157, 180 and 203 BPM, and the gate at each one is 8 loops in a row with no wrong note and no wobble in the time.
PRACTISE THIS BEAT →A 2-bar phrase on crash, ride, snare and kick, in 4/4 at 203 BPM, counted in sixteenth notes. It is written out above, and it covers 26.3% of the bars the kit plays.
Bars 27-29, 31-32, 35-37 and 39-40, and 12 more places. The time is kept on the snare to start with, and it changes 20 times over the song.
74 out of 100 on its own -- demanding. The song as a whole is 76 out of 100: demanding, mostly on the independence between the hands and the feet.