https://docs.python.org/ja/3.8/library/functools.html#functools.lru_cache
https://salamann.com/loop_in_python_is_slow
https://www.theverge.com/2022/5/25/23137789/aio-buying-bots-ps5-xbox-series-x-console-shortage
https://twitter.com/EzoeRyou/status/1529020687188639744
