Playground performance would greatly increase if it could spawn multiple workers to handle concurrent requests, much like php-fpm does. The largest blocker to that is having a shared filesystem with locks support. Let's find a way to support that.

Ideas:

• Implement a MEMFS variation based on a SharedArrayBuffer
• Migrate to WASMFS – is it synchronized between concurrent workers?

Related resources

• https://sqlite.org/wasm/doc/trunk/persistence.md
• PHP.wasm: Explore WASMFS/OPFS #1878