Many agencies supporting public health and emergency response, along with other authoritative sources across the globe, share information about breaking news and major events through maps, apps, and dashboards created in ArcGIS Online. When these web applications are shared publicly, they often experience high demand and generate a large amount of web traffic. Demand may be even higher when the application is shared through news feeds, on social media, and through other media websites and channels. It's important that your publicly shared applications perform well in high-demand, high-volume situations when accessed anywhere in the world.

This new ArcGIS Online help topic outlines best practices to optimize scalability and display performance for publicly shared ArcGIS Online web applications. It also explains the primary mechanisms in ArcGIS Online—feature tiles and response caching—that support web app scalability and performance.