People don't have an agenda against git — it simply doesn't work for them. It's not the holy grail of DVCS', and neither are Hg or bzr; different tools for different people.
Where are you getting your performance results from? The footnote from Google's article[1] on choosing between Mercurial and git states that Hg was faster both over HTTP and when compared to git's wire protocol. But I'm willing to admit those numbers may be old, so is there a newer published benchmark anywhere?