In this Hasty Treat, Scott and Wes are back with part 2 on how to develop for slow internet connections.
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Show Notes
03:27 - Images
- Resize client-side when uploading
- Lazy load or progressive JPG
- Width + height so the content doesn’t shift with placeholders
- Compress your images - lossless and lossy
- Use SVG where possible
08:33 - Scripts + CSS assets
08:51 - Video
- Variable-rate video is key
09:13 - Connections that go in-n-out a lot
- Save form state on page refresh
- Show UI when user goes offline
- window.addEventListener('offline', updateOnlineStatus);
- window.addEventListener('online', updateOnlineStatus);
- Retrying in _____
10:27 - Service workers!
- Serves up local cache initially
12:05 - Fonts
- Font-display CSS https://css-tricks.com/font-display-masses/
- Sometimes possible: tree shake your fonts - load only the characters you need
- font-family: -apple-system, BlinkMacSystemFont, 'Segoe UI', Roboto, Oxygen, Ubuntu, Cantarell, 'Open Sans', 'Helvetica Neue', sans-serif;
14:04 - CSS tricks
- Text over background image — make sure you also set a color so the text will show while the image is loading
14:37 - Testing slow connections
- Dev tools
- Mimic a speed, or 3G
Links
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