Emulate a slow iPhone

I have an iPhone app (Objective C++). My beta testers - some of them, not all of them - are complaining of slow startup, 7 to 10 seconds. On my device (it's a 3GS), it loads in about 2 sec. On t开发者_如何学编程he device simulator - even faster. As things stand now, I cannot even isolate the bottleneck.

Can I somehow slow down the simulator or a fast device? Setting the simulated hardware version to 2.0 does not help.

As a last resort, I could try and borrow an old, slow device from a friend for a night or two. But I'd rather not...

If I were you I'd try profiling the startup with Shark - it's hard to profile startup on the device, one way is to put a 5-6 second sleep statement in ApplicationDidFinishLaunching so you have time to attach Shark and start recording, don't make it too long though or the app will be killed!

Also consider what you are doing on startup that might be a lot longer for some people - looking at address records, or things like that.

Aral Balkan links to some nice tools by Mike Shrag that allow you to get the old slow motion simulation mode on triple shift working in SDK 3. Speedlimit - which allows you to throttle network bandwidth might be useful.

This is an old question, but one option is to use a non-SSD iMac or MBP to test on a slow environment. The latest Xcode versions and simulators (XC version 7 for sure) run extremely slowly on non-SSD devices. More slowly than any actual phone...