The bytecode is designed so that at runtime, it can be mapped into memory and interpreted without needing to eagerly read the entire file. Whole-program optimizations can be performed, such as function deduplication and string table packing. As a result, more time can be spent optimizing the bytecode, so the bytecode is smaller and more efficient. To skip this step, Hermes uses an ahead-of-time compiler, which runs as part of the mobile application build process. This step delays the start of JavaScript execution. To optimize for this environment, we implemented the following: Bytecode precompilationĬommonly, a JavaScript engine will parse the JavaScript source after it is loaded, generating bytecode. Mobile device limitations, such as smaller amounts of RAM and slower flash, led us to make certain architectural decisions. Existing JavaScript engines remain preferable in those environments. As a result of this focus, our implementation provides substantial improvement for React Native applications.īecause Hermes is optimized for mobile apps, we do not have plans to integrate it with any browsers or with server infrastructure such as Node.js. Consequently, our team designed and built Hermes from scratch. Focusing on these metrics leads to strategies and trade-offs that differ from most existing JavaScript engines today. Notably, our primary metrics are relatively insensitive to the engine’s CPU usage when executing JavaScript code. Metrics for MatterMost React Native app running on a Google Pixel, similar in performance to popular phones in markets like India.
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It is designed to improve app performance, focusing on our React Native apps, even on mass-market devices with limited memory, slow storage, and reduced computing power.Īt Chain React 2019, we announced the Hermes JavaScript engine.
After exploring other options, we built a new JavaScript engine we call Hermes. With this data in hand, we knew we had to optimize JavaScript performance in the more constrained environments of a mobile phone compared with a desktop or laptop. As we analyzed performance data, we noticed that the JavaScript engine itself was a significant factor in startup performance and download size.
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To increase the performance of Facebook’s apps, we have teams that continuously improve our JavaScript code and platforms. These issues are generated from various spots, but the people using these apps expect them to run smoothly, regardless of the device they are on. Larger apps using JavaScript frameworks often experience performance issues as developers add features and complexity. Mobile applications are growing larger and more complex.
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