Macbook pro mid-2009 with 2,53 GHz Intel Core 2 Duo
Ram 8 Go 1067 MHz DDR3
NVIDIA GeForce 9400M 256 Mo
Same problem as u, my games starts 10-13 seconds later. As the old posts said, one of the solution is to turn the shaders to medium, the game counter begins now at 3-4 s instead of 12 s. However it is unplayable and laggy (15-20 fps).
I decided to download and run Onyx, a maintenant and cleaning tool (for the pepole who don't know). I cleaned every cache and run every maintenance tool and cleaning tool. Most importantly, i repaired the permissions of the hard drive. Magically, this seems to reduce the startgame to 3 s instead of 12 s, even if I go with the shaders low.
Hope this helps.