SharedArrayBuffer: Deep Concurrency and Shared Memory Between Workers

I just published a new guide about SharedArrayBuffer and how it changes the way we think about concurrency in the browser. This is not just about “sending data faster” to a Worker. It is about understanding the difference between: copying data, transferring ownership, and exposing the same underlying memory to multiple threads. In the guide I cover: what SharedArrayBuffer really is, why shared memory without Atomics is dangerous, how cross-origin isolation becomes a hard requirement, where this model actually pays off, and why it should never be your default choice. My main argument is this: https://tucodigocotidiano.yarumaltech.com/leer_guias/sharedarraybuffer-concurrencia-profunda-y-memoria-compartida-entre-workers/ Once two threads can touch the same memory in real time, you are no longer doing ordinary frontend work. You are designing concurrency.