flowRS Open the IDE
← Tutorials

Real parallelism inside a browser tab

1 min

Older IDE Filmed on the IDE as it was in late August 2026. The editor has changed since, so some screens look different. The written walkthrough is current.

Why flowRS is cross-origin isolated, and what that buys you.

Walkthrough

  1. Open the fabric panel and read the reported capabilities.
  2. The page is served cross-origin isolated, which is the browser's precondition for SharedArrayBuffer.
  3. That is what allows a shared-memory thread pool, so the page can put many threads on one buffer.
  4. Run a parallel workload and compare it against the single-threaded path.

What you take away

You can reason about what the browser can and cannot do for compute, and why this page is served the way it is.

Open the IDE and try it