The beat the song is built on is one bar, played through bars 9-15, 17-23 and 41-47, and 3 more places -- 18.1% 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 ride, snare and kick, counted in sixteenth notes. On its own it scores 73 out of 100 -- demanding -- and the thing that decides that is how many notes a second it asks for.
The whole song is 70 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 124 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 124, 149, 174, 200 and 225 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 225 BPM, counted in sixteenth notes. It is written out above, and it covers 18.1% of the bars the kit plays.
Bars 9-15, 17-23, 41-47 and 81-87, and 2 more places. The time is kept on the kick and crashes to start with, and it changes 29 times over the song.
73 out of 100 on its own -- demanding. The song as a whole is 70 out of 100: demanding, mostly on the independence between the hands and the feet.