Weight
- Serve modern image formats and size images to their display size
- Lazy-load anything below the first screen
- Avoid autoplaying background video on mobile
- Limit web fonts and load them with font-display: swap
Perceived speed
- Render the headline and main action before decorative content
- Reserve space for images so the layout does not jump
- Keep third-party scripts to the ones you genuinely use
Test honestly
- Throttle to a slow connection and reload
- Test on a mid-range Android phone, not only a new iPhone
- Check the site still works with images blocked
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