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.