Okay, no. I know I called out performance in my post, but that was just from my observations. It surprised me to see something be that much slower than pure python. If you show me a near-python code example in a new language, as someone who mostly writes python code, I'm going to go and write it in python and see how it compares performance wise.

The authors never made any kind of false claims at all. You're reading a lot in to both their README and my post.

They've updated the README for a bit of clarity, but even re-reading the README as it was when I looked this morning (and even a few from before) it hasn't claimed to be fast. The claims are all related to the features that it does have, around parallelisation.

Where did he claim it is fast? As far as I can see the only claim is that it scales linearly with cores. Which it actually seems to do.