That might be true, I don't know, I wasn't one of the pre-adoption G+ users. But I can tell you that since G+ has been public, it has always been slower than facebook. The initial page load takes longer, posting a comment takes longer, posting a page takes longer, everything takes longer and as far as I can tell, it always has.
Now that I think about it, yeah, I guess I was one of the beta users. What the hell, I tried that with Gmail, years ago, and that worked out pretty well
The pre-public-release G+ was kind of odd-looking, but my God it was fast. I'm really sad about how quickly it went downhill.