Re: Poor push performance with large number of refs

> I have a repository that's just under 2 GiB in size and contains over
> 20000 refs, with a copy of it on a server.  Both sides are using Git
> 2.1.2.  If I push a branch that contains a single commit, it takes about
> 15 seconds to push.  However, if everything is up-to-date, it completes
> within 2 seconds.  Notably, HTTPS performs the same as SSH.
>
> Most of the time is spent between the "Pushing to remote machine" and
> "Counting objects", running git pack-objects:
>
>   git pack-objects --all-progress-implied --revs --stdout --thin --delta-base-offset --progress
>
> Unfortunately, -vvv doesn't provide any helpful output.  I have some
> suspicions what's going on here, but no hard data.  Where should I
> be looking to determine the bottleneck?