On Thu, Sep 02, 2021 at 11:27:28PM +0200, Christian Weisgerber wrote:
> Stefan Sperling:
> 
> > > I found a way to speed it up a bit further.
> > 
> > Here is an updated version of this patch.
> > The previous version had a bug where I reversed the mixed-revision check.
> > I am now including a new test case in the patch which checks for this issue.
> 
> All I can say is that it is significantly faster and approaches the
> tree -R limit.  (5 merges, so 5 * the time of tree -R.)
> 
>     0m28.18s real     0m23.18s user     0m04.91s system

Great. I've put my changes in.