Note that performance of a development build can differ from performance of a production build

[shanberg]

For instance, as of Athens Beta.89, there's signicant stutter when toggling the sidebars open or closed, which is not present in the production build.

[sawhney17]

Just to clarify, does Athens have a production build to begin with? I'm under the impression that the beta builds were the current versions that are distributed.

[joelhans]

I believe production here means the downloads available on the releases, where as a development means when you download the repo and run it manually. There are no builds beyond those betas.