IO is asynchronous, but code execution is not asynchronous. If a block of code is doing intensive math for 100ms, then that blocks the whole process, and potent

IO is asynchronous, but code execution is not asynchronous. If a block of code is doing intensive math for 100ms, then that blocks the whole process, and potentially other IO, from executing in that 100ms. Perhaps you should think of node as "event-driven" rather than "asynchronous".