Okay, because it keeps happening and I see literally everyone doing it I’m going to preface my comment with this. “For the sake of this comment, let’s just leave unsaid that I feel my own playing isn’t great and blahblahblah etc etc” so my advice is just my personal experience such that it is.
I found when I was having weird (what felt like) physical barriers preventing me from playing a scale at any speed above my current “comfortable” it was/is/continuestobe a sync issue that makes your brain think you’re just too slow with “your hand fingers” to use a Ben Ellerism.
Because man, you’ve got at least (by and large) 3 or 4 useable fingers that need to keep up with a single alternating picking motion. So doing the math that means unless you’ve got some serious neurological damage happening, your left hand side has to operate at roughly 50% to 66% as fast as your picking hand… #napkinmath
I found that if I concentrated on my left hand juuuuuuuust barely fretting the note, or even just letting it mute out because I was barely touching the strings and disregarded how it sounded, I could move my fingers exponentially faster. Sure the sync is still off, but it at least proved to my head brain that “actually you can do this, it’s just a coordination thing” which was useful info and another data point to refer to when you go into those fugue states and want to turn your guitar into firewood…