Comment by leoh

The conclusion reached in this essay is 100% wrong. See " The reftable backend What it is, where it's headed, and why should you care?"

>With release 2.45, Git has gained support for the “reftable” backend to read and write references in a Git repository. While this was a significant milestone for Git, it wasn‘t the end of GitLab’s journey to improve scalability in repositories with many references. In this talk you will learn what the reftable backend is, what work we did to improve it even further and why you should care.

https://www.youtube.com/watch?v=0UkonBcLeAo

Also see Scalar, which Microsoft used to scale their 300GiB Windows repository, https://github.com/microsoft/scalar.