I have a mixed-flock, that I ordered from Ideal last March. All of them (except an EE) were laying an egg a day for me in the warmer months. Now that winter has hit, I have found the following breeds to be the best layers:
*Gold-Sex Links
*Barred Rocks
*Australorps (out of the 2 I have, I always find one of my BAs in the nestbox when its laying time)
The other two breeds; EEs & SL Wyandottes, hardly lay at all. I am able to tell its them, cuz of the type of egg. I would say my EEs give me an egg every 3-4 days, my Wyandottes the same rate and I have 2 of each breed.
I do add supplemental light/heat from 4am, and allow them to roost & go to sleep on their own. HTH!