Improving Node.js loader performance

Node.js has two module systems, EcmaScript (ES) and CommonJS, with ES being the JavaScript standard and CommonJS the Node.js default. The module loader is determined by file extensions and the "type" field in package.json. Node.js reads the package.json file using a function, readPackageScope, which faces performance challenges due to its synchronous nature and interaction with the C++ layer. To enhance efficiency, improvements were made by moving the caching layer to C++, using simdjson for JSON parsing, and minimizing the serialization/deserialization process. These optimizations reduced unnecessary fields in cache and C++ calls, resulting in a 5% faster execution for ES module loading and decreased cache size. The changes were tested in a real-world Svelte application, demonstrating improved performance metrics.

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