The beat the song is built on is one bar, played through bars 5-12, 16-19 and 23-30, and 6 more places -- 33.7% 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 74 out of 100 -- demanding -- and the thing that decides that is how many notes a second it asks for.
The whole song is 81 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 140 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 140, 168, 197, 225 and 254 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 254 BPM, counted in sixteenth notes. It is written out above, and it covers 33.7% of the bars the kit plays.
Bars 5-12, 16-19, 23-30 and 35-42, and 5 more places. The time is kept on the snare to start with, and it changes 23 times over the song.
74 out of 100 on its own -- demanding. The song as a whole is 81 out of 100. Hard, and what makes it hard is how many notes a second it asks for.