Ahh...I hadn't seen it as connected to the speed I click on the Twitter icon with...thanks for checking on this.
It's always good to know that I'm not crazy but as you know, there are always so many variables which affect this stuff that it's very difficult to isolate what's what. I am a fast typist and, in the case of that site which I'm the webmaster for, when I see that one of the two content creators I work with has posted something I find of interest, I do want to get it out on Twitter asap.
Not knowing exactly how you have it set up, I had not realized it would be connected to the fallback links. We just switched to a new host and that's when I noticed the problem, so it may have something to do with the speed of our new server.
I'm happy to know that it will be addressed in the next plugin release and I'm certainly happy to report it. We've used Add-to-Any for close to two years now and that's the only problem I remember ever having with it.