Quality in image editor after rendering

Hello everyone!
Have one problem with image editor. While rendering is go image is cool, but after render finished looks like resolution decrease. But when I save an image, quality stay cool. Why is this happening?
I used Blender 2.92 Alpha on Manjaro Linux and official stable 2.91 on Windows 10. Same problem.

While rendering:

After compositing, but just “view layer - noisy image”

After save image (jpg) :

I found solution, or… May be mistake. In preferences was enabled “Texture limit size”)))