Nvidia driver 470.57: slow performance on external monitor on both Fedora 34,Ubuntu 21.04

Hi, I have installed the lasted nvidia driver 470.57 on Fedora 34 kernel-5.13.4-200.fc34 and kernel-5.11.20-200.fc33 I have encountered a huge difference between using the internal monitor of my laptop (asus zephyrus m15, resolution 1920x1080) and the external samsung monitor 2k resolution I have tried to restore the xorg.conf file, install old driver but the problem is still present.
Then I remove Fedora 34 and I installed Ubuntu 21.04(kernel 5.11.0-25-generic) but the problem remains. On both OS I used the driver with secure boot enabled and specific signing keys. I have also tried without secure boot but the problem is still there.

GPU: Nvidia GeForce GTX 1660 Ti 6GB
CPU: Intel Core i7-10750H