Wow, most of you are waiting a long time.
Earlier isn't better in most cases. I tried using your method when I had Corn and Gems on a hill. My build was
Worker-farmed corn
Worker-who was finished with 1 chop
Warrior-to grow city to size 2. While city grew I made 2 more improvements.
Settler-2 Chops (1ea worker), settler had 1-2 turns to finish and the 2 workers followed the newly made Warrior to the next city site and began pre chop of forest for what would be a Settler set to build first.
Capital began 2nd Settler
City 2 started-3rd Settler-4 total chops
City 2 then went Worker,warrior,barracks
Capital-Settler finished and began growing and building normal things like barracks/troops
3rd and 4th Settlers finished almost at the same time at which point I split up the workers who went to a new city and chopped out a worker first, then each new cities New worker started improvements while the original 2 workers connected roads/resources.
So by 1160 BC I had 4 total cities that consisted of a Capital at 4 Pop with 6 turns to reach size 5 while each new city were virtually identical at size 2 with 1-3 turns of growth accumulated in them. The Capital had 5 improvements while the other cities combined had 3.
I then reloaded and tried my particular method which involves someting like this:
Worker-improve corn
Warrior-size 2
Settler-worker finishes the mine and chops 2X to finish Settler
Worker-1 Chop then follows new Settler
New worker at Capital improves 2 more tiles then begins roads
2nd City begins Settler which is chopped 3x then builds worker-warrior,barracks
Capital is now at 4 Pop and begins Settler,Worker,Worker
3rd and 4th Cities go Warrior,Barracks
By 1160 BC my Captial was size 4 Pop with 2 turns needed to reach size 5 and two of the cities had 2 pop with 1-3 turns of growth on them while 1 city had reached size 3 with 5 turns of growth. My capital had 5 improvements while the other cities had a total of 5 improvements.
I kept trying different variations of the worker,worker, settler that utilized an overall lower population to produce settlers and workers. Both startegies call for chopping which is limited in the Capital to 3 chops with both strategies.......something I arrived at due to the level I currently play(emperor), the average number of forest, and the minimum Health I want remaining after chopping (5).
What it always boiled down was the Capital at size 4 was able to make up the difference in total turns because it only needed 8 turns to make the last settler and 5-6 turns (depending on your micro) for the last 2 workers.
Earlier isn't always better.