Git 2.37 introduces a new mechanism for pruning unreachable objects, built-in file-system monitor support for Windows and macOS, the sparse index feature is now considered ready for wide-use, and a variety of smaller features and fixes.
The Git sparse index feature can allow for speeding up Git commands when using the sparse-checkout feature for large repositories. Git 2.37 marks the point that all Git sub-commands are ready to properly handle the sparse index functionality.
More details on the Git 2.37 changes via the release announcement . Over on the GitHub blog is the usual, lengthier write-up of all the prominent changes to find with Git 2.37.