Add detailed performance audit hints for modern image formats and lazy loading

[unknownIoT]

Web hint currently provides helpful checks for website performance, but it could be enhanced by adding detailed audit hints specifically for modern image formats (such as Web P and AVIF) and lazy loading implementation. These features are essential for improving page load speed and reducing bandwidth usage, especially on mobile devices.

Adding support to detect whether images use efficient modern formats where appropriate, and if lazy loading is implemented correctly, would give developers actionable guidance to optimize their sites further.

This feature would align with webhint’s goal to ensure websites are fast and performant across devices and networks.

I am interested in contributing this feature by implementing new rules to check for modern image formats and lazy loading best practices, along with relevant tests.