I suspect you already know this, but I'm gonna say it anyway... you're not gonna notice a significant time saving by switching to another bike. If you made the effort and really rode your butt off over the ten miles, that's about as fast as you're ever gonna go no matter what you're riding. A new (used) different bike might be more comfortable, but wringing out any time savings couldn't be any more than the time you'd be waiting for a signal to change. I know this point isn't gonna win me any BF love, but somebody's got to be honest here. That's not to say I wouldn't want to buy another bike. I'm already on number three for this year, and that's taken real discipline on my part.
-Kedosto
n+3, but who's counting?