Question Drop in fps when laptop is connected to an external monitor

Sep 17, 2022
I own a Lenovo Ideapad Gaming 3 15AHC6, AMD Ryzen 5 5600H/NVIDIA Geforce RTX 3050/24GB RAM DDR4 3200MHZ/512GB SSD and when I play I always have my laptop connected to a 27’ external monitor via HDMI - AOC 27G2U. I use this monitor as the primary screen so the laptop screen is always off and I have the refresh rate set at 144hz.

However I’ve noticed that when I’m playing using the AOC monitor I lose some fps (20-30 fps) so the game is averaging like 80/90 fps while if I’m using the laptop screen to play the fps I get are around 120-140. Any idea why this happens? Could it be because the external monitor is bigger (27’) and so it uses more GPU and I lose fps?
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