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SynchronousUpdating

SynchronousUpdating
is an option for Manipulate, Dynamic and related functions which specifies whether or not to evaluate their contents synchronously.

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If a dynamic object that needs to be updated has the setting SynchronousUpdating->True, the front end will wait for the necessary evaluation to be completed before going on to any other tasks.

If a dynamic object has the setting SynchronousUpdating->False, the front end will queue up its evaluation, and allow it to be performed asynchronously.

For dynamic objects that take a long time to update, the updating may time out unless the objects have SynchronousUpdating->False.

For dynamic objects with SynchronousUpdating->True the front end blocks until their evaluation is complete.

SynchronousUpdating->Automatic specifies that synchronous updating should be used when controls in an object such as Manipulate are active, and asynchronous updating should be used otherwise.