Responsive Images Best Practice
Provide sizes appropriate to display width and reserve aspect ratio. Enlarging a small source cannot create real detail; retain its clarity limits.
Putting performance and delivery into practice
Delivery depends on responses, asset weight and dependencies. Analyse static assets, dynamic endpoints and third parties separately, including first visits and cache hits.
Checking the result
Repeat tests with consistent devices, networks and pages and record loading and interaction feedback separately. Confirm that optimisation preserves useful content and forms.
