What is kwin_wayland_wr? Also do you really have 6 GiB RAM installed? If not you may be able to reclaim some of it via UEFI if the RAM is assigned to iGPU.
As I found out recently myself, you should almost always set the minimum amount of reserved memory for the iGPU on modern hardware. The reserved memory is just that— reserved. The kernel still dynamically allocates memory for GPU usage as needed on iGPUs.