My times:

Standard 2:54
Lotus flower 2:56
Confounding cross 2:53
Pyramid's Walls 2:58
Tic-tac-toe 2:49
Cloud 2:32
Red dragon 2:47
Four bridges 2:43

Tips for improving your time:
- Play the one with the worst time
- Set informal time goals to beat (mine were 4:00, 3:30, 3:15, 3:00, now 2:45)
- Play, Play, Play!