Problem with connecting Zenbook 14X OLED to LG Ultrafine 4K

[Torstein]

System: Zenbook 14X OLED
Battery or AC: AC
Model: UX5401 11th Gen Intel
Frequency of occurrence: Always
Detailed description：
I have an Asus Zenbook 14X, which slows down dramatically whenever I connect an LG Ultrafine 4K (24in) display via Thunderbolt 3. The image displays just fine on the screen, and everything appears to work fine, but as soon as I try to do something inside of Windows, everything is frustratingly slow.
I run Windows 11, and have installed all available updates. I've updated the Bios to v303. The computer behaves normally whenever the display is not connected, but as soon as I plug in the display cable, everything slows down by a lot. For instance right clicking the desktop takes over a second before the menu appears, and opening explorer can take 5 seconds instead of the usual 1. The image updates correctly, and the mouse cursor doesn't lag behind, but the CPU seems to be struggling. It sort of feels how you would expect Windows to behave immediately after plugging in something new, while waiting for the system to settle, without it ever settling.
I've tried mirroring the displays, and disabling the local display, without any apparent effect. I use the same display with a Macbook Pro, without any problems. Looking at the Performance tab inside Task Manager shows no particular issue with neither CPU, Memory nor GPU. But the GPU does idle around 10% instead of the normal 3% when it's connected. But it doesn't seem to peak above 25%.

[Jiaszzz_ASUS]

Hello, Torstein .
I apologize that I am unable to assist you in deciding what corrections or adjustments are included in the new driver version LG 38" UltraWideTM QHD+ Nano IPS Curved Monitor (38WN95C) published on January 4, 2023.
Please check the image below and the LG official website for more information, if needed.

For the external monitor that makes the laptop run sluggishly, may I ask if you have tried a cross-test with multiple connecting cables or monitors? Does a different external monitor attached to a UX5401E exhibit the same problem?
Thank you.

[ZenBot]

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