"React Native's JavaScript bridge was a well-known performance bottleneck for years. Under heavy UI pressure (fast scrolling, frequent re-renders), teams could hit dropped frames and visible "blank" rendering while work moved across threads and through serialization. Meta's New Architecture (JSI, Fabric, TurboModules) changes that baseline. By replacing the legacy bridge with direct, C++-backed interop and a new renderer, React Native closes much of the historical performance gap for many real-world apps."
"Valdi takes a more radical approach. Built and battle-tested internally at Snapchat, Valdi compiles TypeScript into native iOS and Android UI primitives rather than shipping a JavaScript runtime and reconciling a virtual tree at runtime. For teams balancing performance targets against hiring constraints and release velocity, the question becomes practical: if you can compile to native without React's runtime overhead, is the performance upside worth the ecosystem risk?"
React Native historically suffered visible dropped frames and blank rendering due to the JavaScript bridge and cross-thread serialization under heavy UI load. Meta's New Architecture (JSI, Fabric, TurboModules) replaces the legacy bridge with direct C++ interop and a new renderer, reducing much of that performance gap. Valdi compiles TypeScript ahead-of-time into native iOS and Android UI primitives, eliminating the runtime and virtual DOM reconciliation. The trade-offs include increased architectural complexity and multi-language debugging for React Native's new stack versus compilation and ecosystem risk for Valdi, plus differences in developer velocity, optimization flexibility, and platform bus-factor concerns.
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