The beat the song is built on is one bar, played through bars 6-25 and 50-65 -- 66.7% 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 86 out of 100 -- hard -- and the thing that decides that is how many notes a second it asks for.
The whole song is 84 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 116 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 116, 139, 163, 186 and 210 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 210 BPM, counted in sixteenth notes. It is written out above, and it covers 66.7% of the bars the kit plays.
Bars 6-25 and 50-65. The time is kept on the snare to start with, and it changes 8 times over the song.
86 out of 100 on its own -- hard. The song as a whole is 84 out of 100. Hard, and what makes it hard is the independence between the hands and the feet.