This past weekend I went riding with a couple other guys....one races, the other has done a bunch of track days, which I've done neither of. One point we're hitting twisties, and I found myself tapping my bike out in third gear(95ish), hitting the sweepers at 80+(they were going 100+), and I couldn't keep up. Once I lost sight of them I slowed down...and told myself DON'T upshift past third, you'll kill yourself. I was riding faster than I usually would, but kept myself in check and didn't give into the temptation to try to stay on their tail. Staying within your limits is very important.
And I've never hit peg on my current bike! Did it once on the Katana, and it was actually a pretty slow corner, not a fast sweeper.
Well hopefully I do a track day or two next summer and learn some better cornering techniques and get my bike down further.