> How is this result surprising? The point of coroutines isn't to make your code execute faster, it's to prevent your process sitting idle while it waits for I/

> How is this result surprising? The point of coroutines isn't to make your code execute faster, it's to prevent your process sitting idle while it waits for I/O. It depends on what you mean by "faster". HTTP requests are IO bound, thus it is to be expected that the throughout of a IO bound service benefits from a technology that prevents your process from sitting idle while waiting for IO. Thus it's surprising that Python's async code performs worse, not better, in both throughput and latency. > When you're dealing with external REST APIs that take multiple seconds to respond, then the async version is substantially "faster" The findings reported in the blog post you're commenting are the exact opposite of your claim: Python's async performs worse than it's sync counterpart.