[duncanawoods]

That would block a server for 500ms six times which is still unacceptable let alone being a hack that would mean rewriting the react page to support partial evaluation.

Your suggestion is basically to write your own event loop and write any cpu bound task to manually yield to the single-threaded node event loop. Crazy given we have been using multithreaded servers for decades that would do this automatically and generalise for any cpu-bound task.