While your situation is opposite from the usual case, it's obviously got something to do with power profiles, either Windows's or Nvidia's (or even your OEM's, if you aren't the bloatware-removal type). You'll want to muck around with those until the performance is either equal or better when plugged in.
<@skid_au> fishing resort is still broken: http://i.imgur.com/dvPiQKg.png
<@neobrain> dafuq
<+JMC47> no dude, you're just holding the postcard upside down
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<@Lioncash> pauldachz in charge of shitposting :^)
<@neobrain> dafuq
<+JMC47> no dude, you're just holding the postcard upside down
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<@Lioncash> pauldachz in charge of shitposting :^)