Velocità
Immagini responsive
Perché è importante
Without srcset or <picture>, phones download the same large image files as desktop screens. That wastes mobile data and slows Largest Contentful Paint.
Come risolvere
- Generate several sizes of each image and list them in srcset with a sizes attribute.
- Most CMSs (WordPress, Shopify) do this automatically if images are inserted through the media library.
Verifica con
- Image Alt Text Checker – Find images with missing alt text, missing dimensions and no lazy loading.
- Page Size Checker – Find the total weight of a page and which images, scripts and styles are heaviest.
Punteggio: un controllo superato ottiene tutto il suo peso, un avviso metà e un errore nulla. Come funziona il punteggio SEO