I won't go through my entire procedure because not everything would really be useful, but I will share some things I've found helpful in speeding up my details.
First, I always clay with the wash. This alone cuts a lot of work because you just wash a panel down like usual, grab your clay (I keep it right in the wash bucket), and go to town. No wasted time spraying lube or wiping it up, and no extra wash afterwards. Also, I find that by keeping the clay in the wash bucket, if the clay picks up loose dirt or debris, it will fall off when you put it back in the bucket instead of becoming embedded in the clay. One thing I do recommend if you clay with the wash is to keep the car really wet and rinse clayed areas immediately because otherwise you can end up with a residue (maybe this is just regular soap residue you would get if you leave soap on the car, but to me it seems worse when you clay). You can also use a little more soap than usual in the wash solution if the clay sticks.
Another trick I use when doing two coats of wax, is to clean the interior in between them. This makes for a nice change of pace and also gives the first coat of wax some time to sit. It is mostly a mental thing though, doing two coats of wax back to back is just brutal.
I think of the interior in terms of the stuff you are cleaning up. Garbage, then crumbs, then dust and dirt. If you don't work in that order then you will end up stopping to toss garbage while you are vacuuming, picking up crumbs on your dusting rag (that later fall off), etc.
When doing any process, but especially waxing, I think it is important to work in a logical pattern. When I wax, I like to finish one "level" at a time. I start with the hood and roof because I can do those while standing, then move on to the front grill and bumper, side doors and trunk, because I can do all of these sitting on my little camp stool. Finally, I do the ground effects and front spoiler, at the end, kneeling on a blanket. At each level I work in a circle around the car to spend as little time moving from spot to spot as possible. This technique works well for me in terms of time, and it helps me avoid missing spots.
Thats all for now, I will probably add more later if I think of them. I'm interested to see what other people have to add.