There might have been some minor file corruption but, as
@Karadjgne mentioned, you essentially gave Windows permission to shutdown so any such problems were likely recoverable and recovered on the next full startup.
Almost the same for the reconnected SATA drive. Windows found a "new" drive and had to go through its own housekeeping actions etc. to incorporate the drive and manage it.
As for 3-4Fps's - I doubt that that would be an issue per se and likely not even noticeable for most game play. There are other possible reasons for the slowing - Windows or some apps may have been doing other things in the background. Or if you were playing online - internet can be and has been slow in many places.
Give any problem some time to ensure that the problem is both continual and consistent. And if the problem, especially some metric's, is not really interfering with system performance/game play then leave it alone.
May disappear with some update or other system change.