The beat the song is built on is one bar, played through bars 5, 7 and 9, and 21 more places -- 26.1% of every bar the kit plays. That is the spine of it; everything else is what happens around it.
It is played on crash, snare, kick and hi-hat foot, counted in thirty-second notes. On its own it scores 69 out of 100 -- demanding -- and the thing that decides that is how many notes a second it asks for.
The whole song is 74 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 53 BPM -- and adds the notes back over 4 rungs, each with a tempo to reach and a gate to pass before the next.
Tempo goes 53, 62, 72 and 81 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, snare, kick and hi-hat foot, in 4/4 at 81 BPM, counted in thirty-second notes. It is written out above, and it covers 26.1% of the bars the kit plays.
Bars 5, 7, 9 and 11, and 20 more places. The time is kept on the kick and crashes to start with, and it changes 1 time over the song.
69 out of 100 on its own -- demanding. The song as a whole is 74 out of 100: demanding, mostly on how much of it falls off the beat.