Not true any longer. As described in http://mercurial.808500.n3.nabble.com/named-branches-vs-bookmarks-FUD-tp4006241p4006242.html http://mercurial.808500.n3.na

Not true any longer. As described in http://mercurial.808500.n3.nabble.com/named-branches-vs-bookmarks-FUD-tp4006241p4006242.html http://mercurial.808500.n3.nabble.com/named-branches-vs-book... > We have users with thousands of named branches in production and have > done tests on up to 10k branches and the performance impact is fairly > minimal.