When I charge my laptop will it charge faster on power saver mode if im using it or does it charge at the same rate on high performance during use
It will charge the fastest when the laptop is *off* completely, as you're draining the battery whenever it's not off, completely. If it's in power saver mode, it would charge slightly faster than during normal use, as it's not using as much electricity.
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As usual, thedude is right :D
The difference in charging with power save mode would be minimal, at most it would cut 5 minutes of the charge time.