Every six weeks: A new stable version of Ember.js, just like in Chrome.
I'm trying to turn an organization of a few dozen developers from releasing every 6 months to releasing every 6 weeks and I can assure you that it is not something you just "decide" to do. You have to lay a lot of groundwork. It's not just about branching off every 6 weeks and shoving it out the door, because you'll get poorly tested releases that way and lots of bugs shipping to the customer. You have to change your process so that testing and polishing happens intermittently as part of the coding process, instead of in a big bang testing and polishing event at the end.
Chromium manages it by having extremely rich automated testing and mandating that code must have passed the full set of automated tests on all platforms and have passed a code review cycle before it is checked in. They have their "try" server infrastructure in place to enable developers to run automated tests before committing code. For some projects realizing this is nothing short of herculean, and even if you have solid automated testing in place there's a lot of tooling to be developed, preciously little of which you can get off-the-shelf. If it interests you, they have a slide deck explaining how to work on the chromium codebase.
For us, going from 3-4 was painful but in the long run worth it. Our code is much more readable and 4.2.2 has great speed improvements for trees and grids vs prior 4.x. It's almost as fast as 3.x. The big leap was implementing the "class" system. That's where most of our work was focused.
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