I am using XPS 15 9550 with an i7 6700HQ processor. All below description is based on only using battery as power supply.
I created two power plans, one based on "High Performance" plan and another based on "Balanced" plan. Then I changed all power options of the new balanced plan to make it the SAME as the new high-perf one.
However, I can tell significant performance difference when using these two new plans (using battery only, without power plug). I checked the CPU frequency, and found that when using the one based on Balanced plan, the CPU uses very low frequency.
As far as I know, the only difference of these two new plans is their names (as I have changed them to make them identical in power option settings).
But why do they give difference CPU performance?
Below are the settings I used for both new plans.