Pull requests (PRs), the standard way to collaborate in codebases to ensure quality (among other things).. It turns out that they're actually slowing down software development. But how? 

Dragan explains how the problem lies in the way it's structured: it's asynchronous. There's a lot of time that passes before the code is merged, and the value is delivered. Large PRs are hard to review and course correct, and small PRs can introduce lots of context switches.

However there are ways around this, to have both speed and quality. These ways lie in co-creation: Pair and Mob programming