iOS XCode Simulator running slow

[lastcall]

I'm running XCode 5 with the latest Mavericks 10.9.1 update, and whenever I use the iOS 6.0/6.1 simulator,
my app runs extremely slow with choppy graphics.

I found this command after searching on the subject:
> sudo sysctl -w kern.timer.coalescing_enabled=0

But I have absolutely no idea what it does or what effects it has on my computer.
I don't understand why I even need to do it at all.

 

[DannyBres]

Is the app doing something stupid that is CPU/GPU intensive?

 

[Duncan C]

I'm running XCode 5 with the latest Mavericks 10.9.1 update, and whenever I use the iOS 6.0/6.1 simulator,
my app runs extremely slow with choppy graphics.

I found this command after searching on the subject:
> sudo sysctl -w kern.timer.coalescing_enabled=0

But I have absolutely no idea what it does or what effects it has on my computer.
I don't understand why I even need to do it at all.

I remember reading about that, but don't recall the specifics. It is legit anyway. It's not like somebody's trying to get you to type "sudo rm -rf /" or something.

I'd suggest googling it.

Are you doing a lot of logging (using printf, NSLog, or debugger breakpoints with logging)? Those really slow down your code a lot.

 

[lastcall]

This is old app of mine that has ran smoothly in the past, in both release and debug mode. The only thing that has changed is Mavericks.

If I change to a different simulator other than iOS 6.0/6.1, the problem seems to go away. But, this is very odd behavior. Something that I shouldn't have to fix myself, as it seems to be related to the operating system.

 

[PriapusZA]

Which version of Xcode 5 are you running? 5.1?

If so.. from the release notes:

iOS Simulator!
Developers may experience performance issues when running apps within the iOS Simulator on Mavericks with a simulated OS version of iOS 6.1 or earlier. The suggested workaround for this issue is to disable timer coalescing while using the iOS 6.1 or earlier simulator. (15501929):
sudo sysctl -w kern.timer.coalescing_enabled=0
The iOS simulator sometimes stops responding to hardware keyboard. Usually, quitting and relaunching the simulator will correct this. (14642684)

Hope this helps.