In my 17" 2011 2,3ghz I7 Macbook pro with an OCZ vertex 3, boot times have been improved for three seconds with the last apple's update (may 4th) going from 18 to 15 seconds. And now, the rolling loading circle doesn't even appear below the apple logo in the boot up screen as it used to appear rolling two or three times before the update. It just loads instanctly after the apple logo appears. With AJA System Test, Xbench, and DiskSpeedTest, transfer speeds seems to remain the same. I made all the fixes berofe the upgrade, smc and pr resets, fixing the last apple upgrade with these commands sudo chown root:admin / sudo kextcache -system-prelinked-kernel sudo kextcache -system-caches, and the faster I could get was 18 seconds. Now after the update It boots faster (I also entered the above commands in terminal after the upgrade). This are only speculations, but I think that this improvement can be seen as software fix for the problems of interference that the 17" 2011 macbook pros have been suffering between the sata 6 cable and the battery indicator cable.