I've done it 4 times.
My strategy:
1. Leave Idaho Springs at the crack of dawn with (2) *empty* 1-liter bottles.
2. Fill the bottles at the Echo Lake Lodge.
3. At the summit, turn around *immediately* and start the descent, to minimize the effects of altitude, and to minimize the probability of getting rained on. (I've been rained on two out of four ascents.)
Around 9500' I start consciously making every breathe as deep as possible.
From 12,000' to the summit it is pretty much gasping as fast as possible.