A developer shares five concrete performance lessons learned scaling a Flutter RSS reader app to 21,000 users. Key fixes include using ListView.builder for lazy rendering, caching and downscaling images with cached_network_image, offloading XML feed parsing to background isolates via compute(), staggering network requests to avoid hammering APIs, and implementing an offline-first architecture with Hive for local storage. The post closes with a reusable performance checklist for any list-heavy Flutter screen.
Table of contents
Problem 1: The list that jank under its own weightProblem 2: Images fighting for memoryProblem 3: Parsing feeds without freezing the UIProblem 4: Refreshing 30 feeds without hammering the networkGet ShipWithRathor’s stories in your inboxProblem 5: Keeping it usable offlineThe performance checklist I now run on every list-heavy screenWhat 21,000 users actually taught meWorth reading if you’re going deeper367 Impressions