This way all the users will have to download upfront is the cover image, which seems pretty reasonable to me.

Cet article a pour but d’expliquer comment exposer, sans danger, votre API sur le web… et par conséquent à votre entreprise ! Sans oublier les deux objectifs d’une stratégie de sécurisation d’application : mener la vie dure aux attaquants potentiels, tout en facilitant la vie des consommateurs légitimes.

Predicting what our users will do next is difficult, and it certainly requires a lot of planning and testing. But, the performance benefits are definitely worth chasing.

Adding rel=preconnect to a <link> informs the browser that your page intends to establish a connection to another domain, and that you'd like the process to start as soon as possible.

The Embedded Image Preview (EIP) technique introduced in this article allows us to load preview images during lazy loading using progressive JPEGs, Ajax and HTTP range requests without having to transfer additional data.