There’s tools for parallel execution in Javascript like Worker or node:worker_threads but they have two big drawbacks that make them somewhere between annoying

There’s tools for parallel execution in Javascript like Worker or node:worker_threads but they have two big drawbacks that make them somewhere between annoying and useless: 1. No shared objects between threads. You can share non-resizable contiguous byte arrays (SharedArrayBuffer) but 98% of existing code makes normal objects and arrays, and if you want to send those to another thread, you pay a serialization memcopy round trip (no cast a buffer in this language). This severely limits threading to “shared nothing” style workloads. Can you pass a node HTTP request to another thread? No :( 2. Each thread worker needs to boot up from scratch from its own entry point file. This forces some pretty weird code layout and imposes a big boilerplate overhead as well as runtime overhead. And remember - no sharing! So if your threads need a common resource like a Postgres connection pool, they’re going to create their own copy.