There are 11 built in profiles from a Lossy Edge network with 400ms delay to a cable modem. This SO thread documents some history of the tool in a similar manner to the iOS simulators and developer documentation. Older versions of Xcode before version 4.3.2 embedded a copy of this tool. Apple’s official tool to slow down the network connections on you Mac for testing purposes is Network Link ConditionerĪdditionally, iOS has similar function accessible from within Xcode and iOS 6 or later.