I'm running on fairly large repository (Gentoo's portage, 2.5G .git) and slightly slow hardware (1Ghz arm64) and interactive re-basing is very slow. It seems the main culprit is "git branch --remote --contains " so I'm wondering why it's done and if it is possible to limit it somehow?
These operations are very expensive over the whole repo, for example:
(385.025976377 #1# "branch" "--remote" "--contains" "2bb9cf91e26e")
takes over 6 minutes to complete.