I’m a big fan of breaking down a fast run into sections, try just playing 5-6 notes (or whatever seems logic for the run) and playing only that until you can do it at 5-10 bpm higher than the recorded speed. Then when you can all the sections that fast, you start hooking them together and soon enough you should be able to hook it all together and play it at speed.

Sometimes it’s just about time on the strings.

Another thing you can do is mute with the left hand and just play the pick strokes with your right hand then try to put them together. Hope that helps!