Delay non-visible fotos on mobile

Hi All,

I am requesting help in terms of Google’s Page Speed Insight.

On the URL requested, I’m getting the info, that I need to Delay non-visible fotos on mobile – Now I am doing just that in wordpress, when I label the fotos “hide on mobile” (column settings -> responsive options).

Can you tell me how (no lazy load plugin please) I can delay fotos or even hide them so my page loads faster?

Thanks and best

Chris

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