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The conclusion should probably be that redis is super slow, not that the python 3 implementation is particularly fast. Also it is unclear how python dictionaries would scale for large number of keys compared to redis.

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The Python dictionary implementation is among the most optimized on the planet. Given that Python uses dictionaries for almost everything, very close attention is paid to dictionary performance.

That doesn't automatically mean that dictionaries are just as fast with hundreds of thousands or millions of keys. I don't know one way or the other, but it's conceivable that performance could degrade somewhat with large numbers of keys.

>The conclusion should probably be that redis is super slow, not that the python 3 implementation is particularly fast.

That sounds like the definition of confirmation bias.

How is that substantiated?

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