React Native: Bridge Teardown, Layout Speedups, Cheaper E2E
More than a dozen iOS changes remove or deprecate the legacy bridge APIs, while Fabric layout and JNI lookups get measurable performance fixes. iOS end-to-end testing was also reworked to cut runtime and cost.
Duration: PT2M34S
Episode overview
This episode is a short developer briefing from React Native.
It explains recent repository work in plain language.
- Show: React Native
- Published: 2026-10-31T13:03:52Z
- Audio duration: PT2M34S
Transcript excerpt
This excerpt keeps the crawler page concise. Listen to the episode or use the RSS feed for the full update.
Good morning, it's Saturday, October 31st, 2026, and this is your React Native briefing.
The headline is a clean break from the old iOS bridge, paired with real performance gains in layout.
First theme: the bridge teardown. Contributor Christoph Purrer landed a stack of more than ten removals, including PR 59429 and PR 59434. Dead initializers, module lookups, reload and batch APIs, per-module accessors for networking, websockets and image storage, plus the old inspector category and the Fabric surface…
Second: Fabric speed. PR 59643 eliminates per-child dynamic casts during Yoga layout. Profiling cited in the change showed those casts taking 11 to 18 percent of the JavaScript thread, with layout time dropping roughly 17 to 27 percent in animation tests. Related work in PR 59617 avoids allocating global JNI…
Third: cheaper, faster iOS testing. A seven-part stack reworks the RN Tester Maestro suite. PR 59637 runs all flows in a single invocation to save 20 minutes of driver reinstalls, PR 59638 limits list position flows to release builds only, PR 59640 overlaps simulator boot with setup, and PR 59642 moves runners to…
Also noteworthy: a fix for Platform Color resolving to nothing on…
Nearby episodes from React Native
- Android Scroll Fixes, iOS Input Repairs, and Tooling Cleanup
- Fabric Reliability Fixes and Safe Area Cleanup
- Weekly Recap - Bridge Cleanup and Layout Performance
- Hermes Crash Reporting Fix and Rendering Reproducers
- Android Bridge Efficiency and Style Fixes
- Android Cuts JNI Cost, Hermes Trims Regex Bloat
- Props 2.0 Payload Fixes and Lost Tap Repair
- Touch Reliability, Text Fixes, and Startup Cleanup