We've just released another update to the calendar code. Along with some under the hood tuning, this update makes the calendar a little smarter when handling changes to the practitioner list. When dragging to rearrange or deselecting practitioners to view, the calendar will no longer reload. If you select a new practitioner to show it will need to reload, though.
There is also a minor change to how the regular schedule is shown while loading. In 5, 6, and 7 day views the regular schedule shows while loading, but in 1 and 3 day view it is blanked out. With the new update, the regular schedule also shows while loading while in 1 and 3 day views.