What Selvedge does for you
- The first image on a page loads first, at the right size for the screen, and the rest wait until they are near.
- Each section loads its own code only when it is on the page, and only once.
- Animations run on the graphics card and pause off screen. Slow phones get a lite mode.
- Videos play only while on screen.
What you can do
| Choice | Do |
|---|---|
| Images | Upload at the sizes in image sizes. Shopify converts them to modern formats |
| Videos | Short, muted loops under 5 MB. Two background videos per page at most |
| Apps | Every app adds code to every page. Remove apps you no longer use, and their leftover code |
| The first-visit intro | Leave it off unless your brand needs it: it covers the page for up to 2.4 seconds on a first visit |
| Home page | Ten to thirteen sections is plenty |
Measure
Shopify's report in Online StoreThemes shows how fast real shoppers find your store. For a lab test, run Lighthouse in Chrome's developer tools on your home, a collection and a product page, in mobile mode.
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