The New Architecture and what it changed
React Native's original bridge serialized every call between JavaScript and native code as JSON, which worked but added latency that showed up as jank on animation-heavy or list-heavy screens under load. The New Architecture replaces that bridge with JSI, a direct JavaScript-to-native interface, and Fabric, a new rendering system that lets native and JavaScript work concurrently rather than waiting on serialized round trips.
For projects we build today, this mostly shows up as fewer of the performance workarounds that used to be standard React Native practice: less need to manually optimize list rendering, smoother gesture-driven interactions, and native modules that respond faster since they are no longer paying the JSON serialization cost on every call.










