git rebase -i slow for a reason ?

Hi,

Most of the time, I run git rebase with -i, so while it is slow, I always assumed there was somehow a reason.

For some reason, today, I was running some git rebase without -i, and then the same rebases with -i, but without changing the pick list. While the git rebase without -i were almost instant, git rebase -i was as slow as usual, which is very far from instant.

Has anyone else seen such behaviour ?

Mike