The beat the song is built on is one bar, played through bars 2-5, 11-14 and 32, and 8 more places -- 27.7% of every bar the kit plays. That is the spine of it; everything else is what happens around it.
It is played on 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 83 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 83 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 83, 99, 116, 133 and 150 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 ride, snare and kick, in 4/4 at 150 BPM, counted in sixteenth notes. It is written out above, and it covers 27.7% of the bars the kit plays.
Bars 2-5, 11-14, 32 and 34-37, and 7 more places. The time is kept on the toms to start with, and it changes 19 times over the song.
79 out of 100 on its own -- demanding. The song as a whole is 83 out of 100. Hard, and what makes it hard is the independence between the hands and the feet.