Waking 2012 Macbook Pro from sleep when on mains power

My Macbook takes ages to wake from sleep *when its on mains power* and has been left for a few hours. In contrast, it will wake instantly when on battery power, as my old 2005 ibook did.
However when on mains when you open the lid, you get a progress bar at the bottom of the screen. When this has completed, it displays the login screen but without focus or ability to move the cursor. A pinwheel revolves for a while. After the pinwheel has finished, as soon as you touch the trackpad, you get the beach ball and finally (after a total of about 45 seconds) you get to log in.
Apart from the fact that this doesn't make any sense for a slow wake up on mains and fast wake up on battery, the manner is which it is executed is so cumbersome and un-Apple I'm sure there has to be something wrong, although I've searched extensively and can't find anything to fix it (Tried resetting the SMC etc)
Any help massively appreciated!

Intel-based Macs: Resetting the System Management Controller (SMC)

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Waking 2012 Macbook Pro from sleep when on mains power

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