Question Extend display external monitor

OnlyAlex

Prominent
Sep 16, 2021
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Is it normal when you extend display on an external monitor plugged into my laptop for explorer.exe to use 15-20% of the CPU? It only happens when external monitor is used. Cheers.
 

Ralston18

Titan
Moderator
Update your post to include laptop make, model, and specs. Make and model external monitor? How connected, what resolution(s)?

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Without other graphics related resources to process the video then the job would fall to the CPU.

Take a look at Task Manager, Resource Monitor, and Process Explorer (Microsoft, free) to observe system performance with and without the extended monitor.

Use all three tools but only one tool at a time.

Determine what system resources are being used, to what extent ( % ), and what is using any given system resource.

Process Explorer:

https://forums.tomshardware.com/faq/windows-10-clean-install-tutorial.3170366
 

OnlyAlex

Prominent
Sep 16, 2021
149
10
585
0
Update your post to include laptop make, model, and specs. Make and model external monitor? How connected, what resolution(s)?

= = = =

Without other graphics related resources to process the video then the job would fall to the CPU.

Take a look at Task Manager, Resource Monitor, and Process Explorer (Microsoft, free) to observe system performance with and without the extended monitor.

Use all three tools but only one tool at a time.

Determine what system resources are being used, to what extent ( % ), and what is using any given system resource.

Process Explorer:

https://forums.tomshardware.com/faq/windows-10-clean-install-tutorial.3170366
Apologies, it's an MSI Katana GF66 laptop. External monitor is Samsung, not sure what model number. Could it be the monitor? Connected by HDMI 1080p resolution like the laptop monitor. Tried different HDMI cable.
 

Ralston18

Titan
Moderator
No problem.

Without some way of knowing what "normal" is that additional 15-20% use of the CPU is likely to be expected.

Having two monitors and no additional processing power via a separate GPU means that the CPU has to do all of work.

Here is a link to help explain it all. You can easily find similar links.

https://techguided.com/gpu-vs-cpu-whats-the-difference/

What you may be able to do is some testing.

Start with just the laptop and its screen/monitor. Test and observe CPU usage just after boot, then while doing light work, then more online work, and finally some games. The plan in general would be to increase the graphics work load on the CPU.

Then repeat the process with the second monitor in use. Again watch the CPU.

For both sets of testing: Watch the CPU and to what extent (%) it is being used, and what is using the PSU.

You can also do the testing with Task Manager and Process Explorer (Microsoft, free).

https://learn.microsoft.com/en-us/sysinternals/downloads/process-explorer

Only use one tool at time.

Hopefully you will see a steady pattern showing that the more video being watched the more the CPU's work load increases.

You may also discover, for example, that some other application is being launched or triggered when the second monitor is being used.

Just take your time - no need to rush. Keep notes.

Post anything that is unexpected or perhaps may be contrary to the testing.

No harm in watching RAM and/or disk activity as well.
 

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