(I knew nothing about this until 30 minutes ago, but I just did some quick research)

A Quick zero-to-20mph Guide

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How it works

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1. Results in less to load into memory WHY? It has no Just-in-time (JIT) compilation, instead compiles to bytecode ahead-of-time (AOC). By comparison most (all?) modern browsers have a tricky blend of both.

2. Has no effect on application CPU performance

3. Chrome debugger will connect DIRECTLY to the Hermes engine within the app (simulator or device). By comparison, Chrome debugger uses its own V8 engine to execute code, instead of the JsCoreEngine (?) that React-native uses by default

Results

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Mattermost app

1. Time from load until first user interaction: 4.3s -> 2.3s

2. APK size: 41mb -> 22mb

3. Memory: 185Mb -> 136mb