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SynchronousInitialization

SynchronousInitialization
is an option for Manipulate, DynamicModule, and related functions that specifies whether or not to evaluate the expression given as the setting for Initialization synchronously.
By default, the Manipulate initializations are evaluated synchronously:
Force asynchronous initialization:
By default, the Manipulate initializations are evaluated synchronously:
 
Force asynchronous initialization:
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