What is kind of funny here is that you're right locally. At the same time, the larger tech companies (Meta and Google, specifically) ended up building off of hg and not git because (at the time, especially) git cannot scale up to their use cases. So while the git CLI was super fast, and the hg CLI was slow, "performance" means more than just CLI speed.
I was never a fan of hg either, but now I can use jj, and get some of those benefits without actually using it directly.
I was never a fan of hg either, but now I can use jj, and get some of those benefits without actually using it directly.