I know this has been covered a few times but there are so many new OS X users coming online all the time so I figured I'd mention this again. I have found that when you do a get info on an App and you click on the language arrow you see quite a few languages checked. I don't have any other languages installed on my machine other than english. I read somewhere on the net a wile back that if you uncheck the languages from there and or remove them it helps to improve the apps lauch time. I did notice one thing, when you remove the apps listed except for the one you are using it also reclaims drive space too.
Just wanted to mention this. I have noticed that certain apps do launch quicker after doing this.