One thing that I dislike is having 66 branches in git branch -r, of which 41 are definitely obsolete (other-branches/* and old-branches/* are, except for cairo, between 3 and 18 years old)
Among the non-(old|other) branches there are also a few (the last four in this list) that seem too less than active:
origin/concurrency 3 days ago
origin/fix/no-undo-boundary-on-secondary-buffer-change 8 days ago
origin/scratch/isearch-show-toggles 8 days ago
origin/xwidget_mvp 2 weeks ago
origin/scratch/dbusbind-type-tests 9 weeks ago
origin/scratch/dbusbind-type 10 weeks ago
origin/emacs-24 3 months ago
origin/stream 3 months ago
origin/scratch/project 4 months ago
origin/scratch/quote-escaping 4 months ago
origin/scratch/dynamic-modules-2 5 months ago
origin/scratch/remove-internal-field 6 months ago
origin/scratch/highlight-n-windows 7 months ago
origin/scratch/fix-info-dups 7 months ago
origin/shr-fontified 9 months ago
origin/xwidget 9 months ago
origin/scratch/xref 10 months ago
origin/dynamic-modules-rc2 11 months ago
origin/nsm 12 months ago
origin/emacs-23 2 years, 9 months ago
origin/pending 3 years, 7 months ago
origin/gtk-tabs 5 years ago
origin/x-tabs 5 years ago