The beat the song is built on is one bar, played through bars 4-16, 27-42 and 44-57, and 4 more places -- 67.2% of every bar the kit plays. Learn that one and the song is very nearly finished.
It is played on ride, snare and kick, counted in sixteenth notes. On its own it scores 76 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 66 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 66, 80, 93, 107 and 120 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 ride, snare and kick, in 4/4 at 120 BPM, counted in sixteenth notes. It is written out above, and it covers 67.2% of the bars the kit plays.
Bars 4-16, 27-42, 44-57 and 78-82, and 3 more places.
76 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.