Startup takes around 1-2s for me.
It takes longer the first time you start it after installing a new version, as it has to upgrade the packages. You may want to check that it's not trying to do this when it shouldn't: open up the console, and check that the line "PackageSetup not required" is there, near the top.
Also, I realize you're on a Mac, but do you have any virus checking software installed? This kind of software can dramatically slow down file IO.