The beat the song is built on is one bar, played through bars 10-16, 18-24 and 34-40, and 3 more places -- 32% of every bar the kit plays. That is the spine of it; everything else is what happens around it.
It is played on hi-hat, snare and kick, counted in sixteenth 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 98 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 98, 115, 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 hi-hat, snare and kick, in 4/4 at 150 BPM, counted in sixteenth notes. It is written out above, and it covers 32% of the bars the kit plays.
Bars 10-16, 18-24, 34-40 and 54-57, and 2 more places. The time is kept on the snare to start with, and it changes 14 times over the song.
69 out of 100 on its own -- demanding. The song as a whole is 74 out of 100: demanding, mostly on the independence between the hands and the feet.