Cheetah Speed is the fastest setting for passing time in SimCity. The mode was disabled on March 7, shortly after the game's disastrous launch, in order to take load off the game's overburdened servers. Other "non-critical" features were also removed from the game at the time, such as achievements and leaderboards.
Maxis also said that SimCity Update 2.0 is in development, and promised to reveal formation soon.