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Is there a way to auto scroll to a particular item? focusItem is too slow.

Is there a way to auto scroll to a particular item? focusItem is too slow when working on a tree that consist of 3000 nodes.

There is only one way to focus programmatically - focusItem command
You can try to set scroll state directly ( if you know necessary position ) 
    tree.allTree.scrollTop=NN;