autocad works slower when using an external monitor !?!!?

[OGOUN]

Hi there !

I'm working on Autodad 2025 on a Lenovo with an i9 processor and a NVIDIA Quadro RTX 5000 Max-Q graphic card.

I'm doing pretty basic  steel constructions 2D drawings and I have no problems when I work on the laptop but today I plugged my big EIZO EV2736W monitor.

The laptop doesn't have a DisplayPort slot and the monitor doesn't have a an HDMI slot so I used an HDMI cable with an HDMI>Displayport adaptor on the monitor side.

I use a single screen display (EIZO monitor) and Autocad is slow and have some lags, the cursor moves in a herky-jerky way and for exemple it's very difficult to stretch my drawing.

Anyone know why I have this issue ?

Thanks a lot !

[paullimapa]

Did you install 2025.1 update?

Try setting Gfxdx12 to 0 and restart AutoCAD 

If still no difference then enter GraphicsConfig and change the 2d Display settings to another selection 

[TheCADnoob]

Assuming there may be two video cards on board, make sure that you are using the right one

https://www.autodesk.com/support/technical/article/caas/sfdcarticles/sfdcarticles/How-to-force-your-...

[pendean]

Is your laptop plugged into it's power brick and the light is on (aka it is getting power from your outlet)?

Which video card is your AutoCAD using as listed in GRAPHICSCONFIG command? Does it change when the other monitor is lugged in?
Do you have the 2025.1 update installed? the program's ABOUT command will confirm.

Did you try an HDMI/DP CABLE instead of an adaptor?

[OGOUN]

Thanks to you all for your help..!

First, I made a mistake...I?m still on 2023 and I?m updating  to 2025 right now.

I checked in my Graphics Settings and my video card is not recognized !!!!!

So first of all I'll update to 2025 and get back to you !

I just noticed that in my Autocad Graphics Config it seems that no NVIDIA is detected but this card appears in the Device Manager on Windows10.....

Weird !!!

[OGOUN]

OK....so I installed 2025 with 2025.1 Update and Autocad don't recognize my videocard with and without external monitor !

This is annoying.

[OGOUN]

OK I'm reinstalling the:

NVIDIA RTX / Quadro Desktop And Notebook Driver 537.70

Let's see.....

[paullimapa]

And follow instructions in link provided by @TheCADnoob or in bios disable the other graphics driver so os only sees nvidia. 

[pendean]

@OGOUN Start with the highlighted section here

https://www.autodesk.com/support/technical/article/caas/sfdcarticles/sfdcarticles/AutoCAD-uses-the-w....

Then

https://www.autodesk.com/support/technical/article/caas/sfdcarticles/sfdcarticles/AutoCAD-does-not-r.... 

[OGOUN]

OK I installed the NVIDIA Driver but it still don't recognize.  I'll try what you say @pendean !

[OGOUN]

OK...I followed the steps and I do have this mentionned message:

[OGOUN]

So....must I reinstall Windows ?

[pendean]

---

@OGOUN wrote:

So....must I reinstall Windows ?

---

If you are sure that is it... No Windows reinstall is often required, you need to ask your IT person/friend/colleague/PC repair shop to activate it if you don't feel comfortable (or not allowed to) doing so yourself https://community.spiceworks.com/t/windows-management-instrumentation-wmi-has-to-be-enabled-via-powe...

and

https://support.auvik.com/hc/en-us/articles/204610500-How-to-enable-WMI-monitoring-on-a-single-Windo... 

Unless this is a server level setting as well, then only your IT can address.

[RSomppi]

Don't know if this will help but I recently had to order a Display Port to HDMI cable. During that process, I learned that they are directional. DP to HDMI is not the same as HDMI to DP. Maybe your adapter is directional. This doesn't mean that it won't work at all when installed improperly as there is some 2-way communication.

[OGOUN]

Thank's a lot for your help, I'll try this WMI trick or contact my IT and get back here when I have some answers !

[Simon_Weel]

If you unplug the external monitor and then look at the Graphics config - does it list which GPU is used?

[OGOUN]

No, now even with monito unplugged it did not recognize the Nvidia in Autocad, but it's still appears in the Windows Device Manager.....

[OGOUN · Accepted solution]

Hi everybody !

I finally fully reinstalled Windows 10 and Autocad 2025 and now my NVidia Quadro RTX 5000 Max-Q is working fine !

Thanks for your help !

[OGOUN]

...but now I have another "small" problem that me and some other users had some years ago:

I'll browse topics to see if any solution has been found in the meanwhile !

[OGOUN]

Ah !    

Rectangle pick box problem can be solved by  having tool palettes docked on the left and/or right of drawing window !