Fragmentation isn't the issue. It's your bogged down install if you've had it for a while. Plus support for TRIM ect isn't all there due to AHCI not being on.
AHCI enabled a lot of other bus based features. You would have to Google it for specifics. The #1 thing is garbage collection, caching features, and TRIM.
The only 3 games I've noticed that are sped up are BF3, Skyrim, and Shogun 2. I do notice other games though. For instance, Shift and Shift 2 I can't even read through the stuff before I'm in game, and other such games where loading is reduced.
If you're at 36 seconds you have a problem somewhere. With an AHCI bios screen I'm at 25. You also have a faster SSD than mine.