flutter-pre-caching

Use precacheImage with an AssetImage or NetworkImage inside didChangeDependencies, since it requires a BuildContext. It returns a Future, so you can combine multiple calls with Future.wait and gate rendering with a FutureBuilder.

Call GoogleFonts.pendingFonts with the font variants you need in initState, then use a FutureBuilder to wait for completion before rendering text. For production and offline support, bundle fonts as assets in pubspec.yaml instead.

No, precacheImage only warms Flutter's in-memory image cache and does not persist images to disk. For long-term disk caching of network images, use the cached_network_image package.

Combine HTML link rel=preload tags in web/index.html with Flutter's precacheImage. The HTML preload starts the browser download early, while precacheImage warms Flutter's image cache; note web URLs use the assets/assets/ prefix.

Emojis trigger font fallback downloads on web, causing delayed renders, blank boxes, or font swaps. Either delay decorative emojis past first paint or bundle and preload an emoji font like NotoColorEmoji if emojis are core to the product.

Avoid pre-caching all product images, gallery images, remote feed images, every font weight, and large Lottie or Rive animations not shown immediately. Pre-cache only what the user will likely see in the next one to two screens.