Are the number of fonts and the variants of fonts called (weight, characters used in the project) limited ?
Can a system typo be used?
Fonts can be very large. By reducing the number of policies only to those used in the service, the volume exchanged decreases.
Browser tools/consoles allow to check compliance w/ best practices (FIREFOX: console / alerts)
6 other criteria related to the recommendation: Media engineering: reducing the digital service media as much as possible (images, animations, content, etc.)
Is a media management / use policy in place to reduce their impact, with criteria for media compression and formats ?
Can the functionality be offered without calling external scripts or libraries (JS, AJAX, ...) ?
Does the target functionality require calling an iFrame ?
Can the native system features and components match as needed ?
Are videos and animations only used when they add value to the user ?
Are the images optimized for their functions ?