ximagesrc is super choppy on Linux on high end hardware...

Hi,

I'm using a simple pipeline like this
gst-launch-1.0 ximagesrc startx=0 endx=3800 starty=0 endy=2150 ! 
videoscale ! videoconvert ! autovideosink

on Ubuntu 23.10 using an AMD Ryzen 9 7950X3D and an Nvidia RTX4090.

Video drivers are correctly installed since I can play games at very 
high framerate...

When I try to record the screen with the pipeline above, the screen 
became choppy, mouse starts lagging and the screen record get two or 
three frames per second.

How this is possible?

What can I do to troubleshoot this problem?

Thanks