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I agree with Dad3353, control and quality of playing is more important than speed. So yeah, slow it down, work on your notes, get control of the piece and then play slightly faster until you make mistakes. Once you make a mistake, stick at that speed for a while until you get control again.

As annoying as it is, I've found everything above to be true. It's just taken me about 4 weeks to get one 2 bar run up to tempo for a recording I need to do. I knew what I wanted to play, but could only manage it about half speed. I did try to take a shortcut, but all the way along I knew what was probably the only way... so I went for it, same run every time I picked up the guitar, increasing the metronome by a couple of BPM every few days when I could do it comfortably. It's probably not even that fast or complex for a proper guitarist, but there's a sense of achievement playing it right (almost) every time now.

The fastest way to build up speed is to slow down. Get a metronome (or similar 'app' type of thing...), and play the licks, scales, runs etc at a comfortable speed. Every week, turn the metronome up 5 bpm, rinse and repeat. Do not try to play fast. Play at a regular speed, and increase it slowly. That's the fastest, and most sure-fire, way to build up speed. Disclaimer : a medium-sized bucket of Patience is required; it helps a lot. Renew whenever it runs out (as I suspect it might ...).

Humbucker