Summary
The Git 2.51.0 release introduces significant performance enhancements, notably through batched updates for git-push and git-fetch, which notably speed up operations in large repositories. It also marks the transition to the reftable reference backend as the default for Git 3.0, addressing several limitations of the existing files backend. Furthermore, SHA-256 is set as the default hashing algorithm, reflecting increased security needs. The release removes deprecated commands and introduces pagination support for git-for-each-ref, optimizing use in large projects.