I Rewrote Our Crawler with asyncio and Got a 15x Performance Boost

A developer refactored a news crawler from blocking requests to asyncio and aiohttp, cutting runtime from 487 seconds to 32 seconds.

The new version used concurrent async I/O with the event loop and asyncio.gather to handle many HTTP requests in parallel.

The result shows how async can greatly improve I/O-bound crawler performance without thread overhead.

The article also warns that too much concurrency can overload the target site and trigger blocks, so limits like asyncio.Semaphore are important.