WPF UI thread freezes momentarily when a mouseup event triggers an animation?

From the back and forth stack traces it's obvious that the main thread is waiting on something to fully flush. I have no idea though what a SyncFlush is or how you'd work around it.

When you UI thread is blocking, it's usually because some operation you are executing on the event is not being run in it's own thread. I'd say to check the mouseup event for a long running operation that can be shoved off to a background thread and allow the UI thread to be free to dispatch other events.

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