The beat the song is built on is one bar, played through bars 3-9, 21-27 and 33-35, and 7 more places -- 23.8% of every bar the kit plays. This one moves around more than most: the beat is where to start, not the whole job.
It is played on crash, 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 86 out of 100, so the beat is not the hard part: what costs you is everything around it, the joins and the fills.
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 163 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 163, 192, 221 and 250 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, hi-hat, snare and kick, in 4/4 at 250 BPM, counted in sixteenth notes. It is written out above, and it covers 23.8% of the bars the kit plays.
Bars 3-9, 21-27, 33-35 and 63-66, and 6 more places. The time is kept on the kick and crashes to start with, and it changes 24 times over the song.
69 out of 100 on its own -- demanding. The song as a whole is 86 out of 100. Hard, and what makes it hard is how many notes a second it asks for.