💥Async is designed for I/O-bound workloads, not CPU-bound computation. 1. CPU-bound tasks Heavy computation (data processing, encryption) Limited by CPU 2. I/O-bound tasks Waiting for external operations (DB, API, file) Limited by latency 3. Async works best for I/O-bound tasks It frees the thread while waiting 4. Async does NOT speed up CPU-bound work 5. Misusing async leads to no performance gain 6. Understanding this is key to using async correctly 7. Async improves scalability, not raw speed Keywords: async, cpu bound, io bound, backend, performance, concurrency #dev #interview #backend #fyp #systemdesign