Another slow starter - it's why I prefer distance events also.
Let me ask an "additional" question: when you stop for too long does it seem to take awhile to get back "up to speed"? Not as long as the start but it's one of the reasons I prefer not to get off the bike during long rides or if I do I try to limit my time off to under 10 mins. Anything longer and it seems like I have to have a serious talking to with my legs about what we're doing out here!! I was a runner first and even with warmup stretches I never really started to hit my stride until about a mile into my run so I didn't think anything of it when I started riding heavy. I do like spinning coz in the beginning I just spin until I can seem to get everything coordinated!
Life should NOT be a journey to the grave with the intention of arriving safely in an attractive and well preserved body, but rather to skid in sideways, champagne in one hand, strawberries in the other, body thoroughly used up, totally worn out and screaming: "Yeah Baby! What a Ride!"