Re-ordering entries causes multiple commits (one per entry), in contrast to re-ordering pages which fires a single PagesMoved event (and therefore a single commit).
This actually needs to be addressed in the Statamic core with a new EntriesMoved event that overrides the individual EntrySaved events, but since it's being reported in unrelated issues here (see #32 (comment) and #31 (comment)), I thought I'd create a new issue to address this specifically 🙂