One of the most revered guitarists of this generation and leader of the seminal band Children of Bodom, Alexi Laiho is known for, among other things, having a ridiculously precise picking hand. Speed and precision are two of the trickiest things to practice correctly, and are definitely an instance of the anti-adage “practice makes permanent.”
Warm-ups are therefore crucial – you can’t skip any levels when it comes to picking. So you should check out the following technique that Alexi discusses in the below video for Total Guitar and start upping your game: