React 19.2 in the Wild: Activities, Effects, and Performance in Practice

React 19.2 introduced new primitives for managing effects, background rendering, and performance, but most teams don’t adopt them straight from the release notes. Production apps carry constraints, legacy patterns, and performance debt that make change slower and riskier. This talk looks at React 19.2 in the wild by breaking down how typical UIs we build in real applications can evolve with the new APIs. We’ll look at how <Activity />, useEffectEvent, and cacheSignal change common approaches to state, rendering, and data handling, and how to start taking advantage of them to make everyday React apps feel smoother and more predictable.