A consistent storyline during last season (and seasons prior) was rest given to the Bulls and how they performed as a result. Ian Levy over at Nylon Calculus spells it out:
The Bulls were outscored by 3.2 points per 100 possessions on back-to-backs, about the same as the Brooklyn Nets' scoring margin last season. One two days of rest, they outscored opponents by 9.7 points per 100 possessions, a margin that would have ranked second in the league behind the Golden State Warriors across the entire season. So at team level, two days of rest was worth about 13 points per 100 possessions in net performance.