Although some or most know this i'd thought i'd share it to help out the new guys.
When making for example archers, to make 3,000 in one bulk takes a good two or so days and this is too long for most of us.
So i worked out if you sperd out the production to all barracks the time to make 3k is only put down to about seven hours.
So now one barracks is only making a 600 or 700 insted of 3,000 and when one barracks finishs so doe's the others at the same time and presto you got 3,000 archers in 8 hours insted of 49 hours!
Now the only down sides to this is that you production depends on: How meny barracks you got and what level they are.
This way in my opinion is better then building in huge bulks which sometimes can take days.
Any questions just replay to this topic i'll get back to you ASAP.