The beat the song is built on is one bar, played through bars 12-14, 24-30 and 32-39, and 18 more places -- 32.4% 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 sixteenth notes. On its own it scores 52 out of 100 -- a step up -- and the thing that decides that is the independence between the hands and the feet.
The whole song is 76 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 80 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 80, 94, 109 and 123 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 123 BPM, counted in sixteenth notes. It is written out above, and it covers 32.4% of the bars the kit plays.
Bars 12-14, 24-30, 32-39 and 50-56, and 17 more places. The time is kept on the ride to start with, and it changes 16 times over the song.
52 out of 100 on its own -- a step up. The song as a whole is 76 out of 100: demanding, mostly on the independence between the hands and the feet.