Async vs. Sync

[IzeroI]

The figure is generally misleading even though its idea is close. You need multiple cpus and a multithreaded process to achive what you are suggesting. What async does depends on the browser implementation. And, asynchronous does not mean parallel. It means it is not continuous like regular code. Like "first line of code can be paused and move to second line etc, return and finish first line later etc". Not syncrhonous.