Question Why my dps drops when I try to plug my laptop to usb fan?

[DORORONPA]

Hi guys, I just wondering every time I try to plug my laptop to usb fan my gaming performance always drop(dps drops to 10-30) but every time I plug it out my dps back to normal(60-90 fps for overwatch).

 

[CountMike]

Hi guys, I just wondering every time I try to plug my laptop to usb fan my gaming performance always drop(dps drops to 10-30) but every time I plug it out my dps back to normal(60-90 fps for overwatch).

Fan takes some power away.