The beat the song is built on is one bar, played through bars 27-33, 35-41 and 67-73, and 3 more places -- 27.4% 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 79 out of 100 -- demanding -- and the thing that decides that is how many notes a second it asks for.
The whole song is 84 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 77 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 77, 93, 109, 124 and 140 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 one-bar groove on crash, ride, snare and kick, in 4/4 at 140 BPM, counted in sixteenth notes. It is written out above, and it covers 27.4% of the bars the kit plays.
Bars 27-33, 35-41, 67-73 and 75-81, and 2 more places. The time is kept on the ride to start with, and it changes 13 times over the song.
79 out of 100 on its own -- demanding. The song as a whole is 84 out of 100. Hard, and what makes it hard is the independence between the hands and the feet.