How to optimize preview compression

I think this topic will concern many people who want to make a portfolio site responsive for a wide screen and also developers who want to do their job well. Dear Plugin Developer. I use justified tiled settings, if the gallery image is large, then the blur becomes visible, there is not enough clarity of the images, it is probably because of how the preview optimization works. I noticed one interesting feature, if I turn on the Google Chrome development tools, then in this mode the images become clear (https://clip2net.com/s/4bFgJCl) such clarity would satisfy me if it was in every browser by default, but this it becomes clear only when I press F12 and open the Google Chrome development tools. Images on a site without development tools https://clip2net.com/s/4bFhfQH The problem becomes more noticeable when I enlarge images and one image takes up the entire width of the site. I would be very grateful to receive answers to two questions.
-Why does the image get beauty sharp when I enable Google Chrome dev tools?
-How can I achieve a similar effect,how make large images clearer on the site?

• This topic was modified 5 years, 1 month ago by igoryoki.
• This topic was modified 5 years, 1 month ago by igoryoki.

The page I need help with: [log in to see the link]