Yes mine does that, I also have a KTM with a spare Battery and it does it with all of them.
A point worth noting is I left it on the KTM over the winter and it would hardly turn over when I tried it, so just when I was on the point of replacing said battery I put the old fashioned type car charger on overnight - its like a new one now and still whizzing the bike over a month on.
Replaced the optimate with a CTEK - seems ok
I think that GS1200's are slow to crank anyway as it its a fairly small battery with 2 big cylinders and probably thick oil this time of year.
Perhaps synthetic oil would help, maybe I'll start a "which oil" thread????????????