Speed is something that most novice guitar players strive for as they think that pure dexterity makes them a better player. That's not exactly true (listen to Joe Walsh or David Gilmore are great examples), since the faster you play, usually the less passion and soul you play with.
That being said, here's an interesting video by guitarist Tiago Della Vega playing the classic song “Flight Of The Bumble Bee” by Nikolay Rimsky Korsakov. Tiago plays at tempos that gradually ramp up to 320 bpm, which is totally outrageous.
I still prefer Joe Walsh, but this is a great performance.
World Record Guitar Speed 2008 Tiago Della Vega - Amazing videos are here