You can set the network to slow characteristic by testing on devices. Go to Settings -> Developer Settings -> Network Link Conditioner -> Enable. This is for iPhone/iPad running iOS 6
Network Link Conditioner is also available for the Mac in “Additional Tools for Xcode” for testing in the Simulator.
Note: It appears after device has been connected to Xcode, enabled for development and some app run on it.
Here’s how you can test HORRIBLE network performance:
