Hey guys, i just saw another guy writing a thread on alternate picking... I really have a problem with this. My picking style over the years have developed into something not good it seems. I can play some fast stuff, but mostly use a mix of picked notes, hammer ons, and pulloffs. check this (https://www.youtube.com/watch?v=dh379kD_lDE&list=UUdvo8i_aYTdE2d3D5DSwX6Q)

BUT, there is this song here which made me realise that something is wrong. https://www.youtube.com/watch?v=rRaDQBMMbrM

At the verse riff especially, i can't keep going for more than max 7-8 seconds at full speed before my whole picking arm becomes super tense, and the speed drops so i can't keep up.
I have tried everything to fix my picking issue, but everything I do I fail at.. I simply can't get to a proper level of speed when alternate picking, some people would even say that this song i linked aint even fast. And when i watch people play a cover of it on youtube, they don't even seem to struggle with the picking at all. What can i do :( i feel like i don't even want to play any more if I can't fix this thing....