MSI GL66 Performance

[holonius15a502de]

Good morning, I have a question about the performance, when I remove the power supply, the computer's screen goes black for a second and its performance drops, without a doubt, still having the maximum performance in the power options, but when I put the power supply on, the black screen for a second and returns to very good performance, is this normal? for what is this.
The computer is barely two days old, thanks and greetings!

 

[badboy2k]

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