This page outlines the activity level of the project: https://github.com/CleverRaven/Cataclysm-DDA/pulse
Over the last month, the average activity level is between 4 and 5 pull requests merged per day, 3 issues closed per day, and 2 new issues opened per day.
Each pull request represents one or more new pieces of content, features, or bug fixes.
In case that doesn’t give enough context, I’d describe that as an “unbelievably high rate of change”.