Why is this Ride so Hard?

I'm not quite sure what was going on Saturday morning but there was definitely something up with the ride. I felt like I had done everything right the night before. I got to bed at a reasonable time, I loaded up on Carbs and Electrolytes and I drank plenty of water. This is a ride I do quite often, it's not something that is out of the ordinary, and it's not a terribly difficult ride. I do the La Tuna Lida Lap almost every weekend and this ride was just a minor variation of it with an extra climb in Griffith Park. What was weird about this ride was that I didn't ever feel warmed up. Usually I hit the road and I'm a little stiff and sloth-ish for the first 30-45 minutes. But I typically hit a point where everything loosens up and seems to work right. This never seemed to happen on this ride. I never started cramping, never felt totally exhausted, but when I got to the top of La Tuna I felt like I wanted to cry. Everything was just off for me. Maybe it had something to do with the 6 cape cods I drank the night before.