We Ralph Wiggumed WebStreams to make them 10x faster

This post describes fast-webstreams, a WHATWG Streams API reimplementation backed by Node.js internals to cut server-side rendering overhead.

• •Native WebStreams allocate multiple objects and microtask hops per chunk, causing a 12x throughput gap vs Node.js pipeline()
• •pipeThrough chains lazily resolve to a single pipeline() call with zero Promises per chunk, reaching ~6,200 MB/s (~10x faster)
• •Buffered reads use synchronous Promise.resolve() for 3.7x faster chunk-by-chunk throughput
• •The React Flight byte stream pattern sees 14.6x improvement (1,600 vs 110 MB/s native)
• •fetch() through 3 transforms gets 3.2x speedup via deferred resolution and a single native bridge
• •Passes 1,100 of 1,116 Web Platform Tests; can patch global stream constructors