Add link to our experiences with --no-tags

doc/ci/large_repositories/index.md

@@ -114,6 +114,11 @@ For example, if your project contains a large number of tags that your CI jobs d
 you could add [`--no-tags`](https://git-scm.com/docs/git-fetch#Documentation/git-fetch.txt---no-tags)
 to the extra flags to make your fetches faster and more compact.
 
+Also in the case where you repository does _not_ contain a lot of
+tags, `--no-tags` can [make a big difference in some
+cases](https://gitlab.com/gitlab-com/gl-infra/scalability/-/issues/746).
+If your CI builds do not depend on Git tags it is worth trying.
+
 See the [`GIT_FETCH_EXTRA_FLAGS` documentation](../runners/README.md#git-fetch-extra-flags)
 for more information.