Computer slows down when connected to external monitors

"Srinivas Murty



Rep: 193




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"I would start off by opening the system and cleaning the dust out of the fans. Make sure both working.

I would also download this app: TG Pro even using the free version might clue you in on whats happening with the heat transfer from the CPU and/or GPU. The full version offers more for less than $20 US its worth it!

Look to see if the heatsink temp is following the GPU/CPU's temp. If not the heatsink has likely lost its coolant so the CPU or GPU is not able to shed its heat so the system is throttling down.

If the values are the same then you'll need to look deeper into the system as well as see if the drive is too full. SSD's need a bit of wiggle room for wear-evening. In addition, if the system is only a 8 GB model the system maybe using the SSD for virtual RAM and depending on the app cache or paging."

Have you checked if the display settings are using the external monitors? If it is thats probably it. I changed it back to display and it stopped lagging

"I have had a very similar problem with MacBook Pro and Samsung external display. So after an hour on support to Apple and Samsung doing PRAM resets etc and both blaming each other,

Apple mentioned that third party software could be causing it. I was running Flux (which is a colour temperature app. Like nightshift). Removed that and it worked instantly. Check any third party apps that might be running in the background and then reintroduce them.

Good luck everyone!"

Can you adjust screen resolution se if that helps?