flutter-smell-list-performance

Flutter ListView scrolling is slow when lists use non-builder widgets, lack stable keys, or render complex item widgets all at once. Converting to builder variants and implementing pagination or virtualization fixes the janky scrolling.

Fix janky scrolling in a Flutter GridView by identifying non-builder patterns and converting them to builder-based rendering. Applying stable item keys and enabling pagination or virtualization further smooths the scrolling.

You need to use ListView.builder in Flutter when rendering large data sets or complex item widgets. It lazily builds items on demand, preventing slow builds and janky scrolling that occur with standard non-builder lists.

The best way to add stable keys to Flutter Slivers is to assign unique identifiers to each item widget instead of using index-based keys. This preserves widget state and prevents unnecessary rebuilds during list mutations.

Converting to a builder pattern significantly improves Flutter list performance for chat lists. It renders complex item widgets lazily, and combined with stable keys, ensures smooth scrolling even with large data sets.

You can apply virtualization to non-builder Flutter lists by converting them to builder variants like ListView.builder or SliverList. This transition enables on-demand rendering for large data sets and complex item widgets.