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

Sep 17, 2022
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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?

Also posted here: https://forums.tomsguide.com/threads/drop-in-fps-when-laptop-is-connected-to-an-external-monitor.507831/
 
Last edited by a moderator:

COLGeek

Cybernaut
Moderator
Size of the display has nothing to do with performance. Resolution does.

What resolution are both displays? The refresh rate also impacts performance as that requires more processing power from the GPU.
 
Sep 17, 2022
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Size of the display has nothing to do with performance. Resolution does.

What resolution are both displays? The refresh rate also impacts performance as that requires more processing power from the GPU.
Both displays are at 1920 x 1080. Yes but the game as a feature where you can unlock the fps (the game itself has a max of 50 fps - over 50 it only helps to smooth the camera movements) so you can get much more than that depending on the GPU. That's why I get 120-140 while using the laptop display but I get a bit less when I use the external monitor as the main display (like 20-30 fps less). Is there a way to increase the fps so it's almost identical to the laptop monitor?
 
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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?

Also posted here: https://forums.tomsguide.com/threads/drop-in-fps-when-laptop-is-connected-to-an-external-monitor.507831/
I had this problem with my laptop where Halo would run at 60 FPS on the internal screen but I would get big FPS drops on the external screen. Are you sure the internal screen isn't doing anything, like it's not just displaying a black screen for example. Your display settings are set to 'Show only on 2' or whatever your external monitor is called.

The size of the screen makes no difference, only the resolution and the connection to the monitor will impact performance. If the game was run at the same resolution on the external monitor and the HDMI port was wired directly to the GPU then the performance between the internal and external screen should be identical.
 
Sep 17, 2022
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I had this problem with my laptop where Halo would run at 60 FPS on the internal screen but I would get big FPS drops on the external screen. Are you sure the internal screen isn't doing anything, like it's not just displaying a black screen for example. Your display settings are set to 'Show only on 2' or whatever your external monitor is called.

The size of the screen makes no difference, only the resolution and the connection to the monitor will impact performance. If the game was run at the same resolution on the external monitor and the HDMI port was wired directly to the GPU then the performance between the internal and external screen should be identical.
Yes, the image is only displaying on the 2nd monitor (external monitor). The laptop screen is off. Resolution is the same aswell (1980 x 1080). I don't know what else to do. What I found out is that if I reduce the size of the window of the game to watch a video while I'm playing (like the game occupies half of the screen and the other half is on youtube) the fps increase which makes me think that maybe it has something to do with the size of the image displayed...but i don't know.
 
Yes, the image is only displaying on the 2nd monitor (external monitor). The laptop screen is off. Resolution is the same aswell (1980 x 1080). I don't know what else to do. What I found out is that if I reduce the size of the window of the game to watch a video while I'm playing (like the game occupies half of the screen and the other half is on youtube) the fps increase which makes me think that maybe it has something to do with the size of the image displayed...but i don't know.
It sounds to me when your in windowed mode shrinking the window reduces the resolution which is why it performs better. When your running the game is the integrated GPU showing a lot of activity? If your laptop is using the Nvidia 3050 it may be that the output from the Nvidia GPU is still going through the integrated GPU before it gets to the HDMI port.
 
Sep 17, 2022
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It sounds to me when your in windowed mode shrinking the window reduces the resolution which is why it performs better. When your running the game is the integrated GPU showing a lot of activity? If your laptop is using the Nvidia 3050 it may be that the output from the Nvidia GPU is still going through the integrated GPU before it gets to the HDMI port.
I don't think so. How do I fix that?
 

Karadjgne

Titan
Ambassador
144Hz vs 60Hz. Laptops have 1 function that pc's do not and should not have, power saving features. That includes temp regulation. With a 60Hz monitor that's being powered by the laptop, you'll almost certainly see lower fps as you'll be reaching power and thermal limits, whether actual or imposed. You won't get that with an external monitor that's not being powered by the laptop, that power can be applied elsewhere or isn't a limiting factor.
 

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