I've been playing for 13 years and when I say fast, I mean hyper speed.
When I see myself on video, it seems fast, but it's like in a vehicle when you're driving at a certain speed.. it's fast but you feel it slow. I mean, it's not the same when listening/watching than when actually playing. Or is it just me
Wider intervals give an illusion of speed as well. I have never played with a metronome and consider myself to be at least able to play at a good speed.
I like how the guitar pro's gradual metronome speed up works for that. I loop the part I want to practice 50% bpm increasing in intervals between 2 to 10%