Startup times have increased quite a bit in later versions. On my i7-3820, it's now up and running in 20 seconds cold / 10 seconds warm.
My earliest installed version is CC2014, which starts up much faster - 7 seconds and 3 seconds respectively.
If you have significantly longer launch times than around 20/10, some subroutine is probably stalling the process. Look at the splash screen, which lists sub-modules as they load, and see if something uses a lot of time.
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I tried setting my Windows Photoshop startup shortcut to start minimized however Photoshop did not start that way. And the more add-ons and pattern you have added to Photoshop the longer it take for Photoshop the fully initializes. There also seems to be a windows focus battle raging when Photoshop initializes on windows.
I have the same issue. You essentially have to watch Photoshop load. Slowly, even on an SSD.