Premiere Pro work on 4K Monitor Using A lot of CPU and lagging

So, recently I updated new monitor with 4K resolution, and now work in Premiere Pro become slow and laggy.

I've already worked with set of two monitros (32" 4K and 27" Full HD), and then I worked on 4K, but Premiere Pro didn't open in 4K, rather in 4K but with low textures, blurry, like Full HD, but everything worked perfectly. As After Effects as well, it doesn't use a lot of CPU, and hit CPU to 50C.

But work in Premiere Pro changed, it always hit CPU to 70C, it works very slow and always lagging, and this is strange. Is there any way to optimize it?

My PC:
OS: Win 11
CPU: Ryzen 9 7900x 12 Core
GPU: Nvidia RTX 3070 Ti 8GB
RAM: 64GB
And work with SSD and external SSD