<ul data-eligibleForWebStory="true">CPython uses GIL to prevent data races and memory corruption in multithreading.GIL allows only one thread execution at a time, impacting CPU-bound tasks negatively.CPython's GIL-free build in Python 3.14 beta improves performance for CPU-bound tasks.GIL limitation remains for I/O-bound tasks while CPU-bound tasks benefit from multithreading.CPython GIL supports I/O tasks well but hampers CPU tasks, alternative is multi-process approach.