We've retooled much of our UI to better handle large volumes of data. In case you're interested in the details (and you're reading a changelog, so you probably are 🙃), we've implemented virtualized rendering throughout the UI. This means that long lists and tables lazily update the DOM only when a user scrolls through the list or table. Previously, we loaded all data into the DOM eagerly, whether a user needed to see it or not. This behavior was responsible for a noticeable slowdown in large classes
If you spend a lot of time in the Admin Console managing a large course, we think you'll notice things feeling a bit zippier.