{
  "id": 13069814,
  "title": "Measuring the ROI of TurboModules before you commit to the rewrite",
  "url": "https://urgent.news/2026/10/09/measuring-the-roi-of-turbomodules-before-you-commit-to-the-rewrite",
  "topic": "tech",
  "section": "Tech",
  "published": "2026-10-09T08:30:03.000Z",
  "source": {
    "name": "Dev.to",
    "slug": "dev-to",
    "url": "https://dev.to/techamit95ch/measuring-the-roi-of-turbomodules-before-you-commit-to-the-rewrite-2hij"
  },
  "original_language": "en",
  "account": "In this account, a team at Synapsis Medical Technologies was integrating real-time health data from wearables into a React Native environment but faced performance issues with the Bridge under high-frequency data ingest. The team of 21 engineers was under pressure to migrate to TurboModules and the New Architecture (React Native 0.76+) but had to balance architectural refactoring with feature development on the product roadmap. If engineers blindly migrate a stable Native Module to a TurboModule, they might spend excessive engineering time to achieve marginal overhead savings that were not their bottleneck. To avoid costly architectural mistakes, it is crucial to measure the ROI before committing to a rewrite. The key steps include:\n\n1. Trace the Bridge Traffic by logging each call between JavaScript and Native using the MessageQueue spy. This helps identify high-frequency bottlenecks caused by a flood of calls to the same module or large JSON payloads.\n\n2. Measure Bridge Latency with Systrace to identify gaps where the JS thread is idle while the Native thread is busy, indicating significant overhead.\n\n3. Define the Codegen Spec by creating a TypeScript interface (Native[YourModuleName].ts) that ensures type safety for synchronous methods. Run the codegen script to generate the C++ glue code (JSI) and Java/Objective-C boilerplate.\n\n4. Implement the Synchronous Method in native code, allowing JS to hold a reference to C++ host objects, moving from sending letters (Bridge) to calling functions (JSI).\n\nThe cost of TurboModules includes increased build times and a higher developer experience requirement. Codegen adds significant overhead to the build process, necessitating C++ development, and may introduce compatibility issues with third-party libraries. TurboModules should be considered if the app requires immediate performance improvements for high-frequency data ingest, but not for standard CRUD applications where the Bridge is sufficient.",
  "summary": "I was leading the architecture for a clinical AI platform at Synapsis Medical Technologies, where we were integrating real-time health data from wearables into a React Native environment. We were hitting a wall with the Bridge. As we scaled to handle high-frequency biometric streams, our UI thread started dropping frames during heavy data ingest. The immediate internal pressure was to migrate…",
  "key_points": [
    "Trace Bridge Traffic to identify high-frequency bottlenecks",
    "Measure Bridge Latency with Systrace to spot idle JS thread issues",
    "Implement Synchronous Method in native code for JSI reference"
  ],
  "editors_take": null,
  "illustration": null,
  "coverage": {
    "outlets": 1,
    "also_reported_by": []
  },
  "ai_generated": true,
  "disclaimer": "Summaries, key points and the editor’s take are written by software from other outlets’ reporting and may contain errors — always check the linked original."
}