1) Measurements are faulty. List of 1,000 ints can be 4x smaller. Most time measurements depend on circumstances that are not mentioned, therefore can't be reproduced.

2) Brainrot AI style. Hashmap is not "200x faster than list!", that's not how complexity works.

3) orjson/ujson are faulty, which is one of the reasons they don't replace stdlib implementation. Expect crashes, broken jsons, anything from them

4) What actually will be used in number-crunching applications - numpy or similar libraries - is not even mentioned.