The beat the song is built on is one bar, played through bars 12-14, 16-18 and 20-22, and 8 more places -- 31.4% 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 thirty-second 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 100 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 48 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 48, 58, 68, 78 and 88 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 88 BPM, counted in thirty-second notes. It is written out above, and it covers 31.4% of the bars the kit plays.
Bars 12-14, 16-18, 20-22 and 24-26, and 7 more places. The time is kept on the kick and crashes to start with, and it changes 13 times over the song.
74 out of 100 on its own -- demanding. The song as a whole is 100 out of 100. Hard, and what makes it hard is how many notes a second it asks for.