Simulator become very slow

Question

I don't know why, the simulator become very slow no matter switch the interface or animate, but type in textField, it is normal, without slow.

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Attempt -1

I restart Xcode and Simulator, but there is no effect.

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Attemp -2

I clean the project, did not work too.

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Attempt -3

I set the simulator's Graphics Quality Override to Low Quality, also do not work.

Answer 1

Check, if Debug->Slow Animations option is enabled