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While uploading a document into a library I want to choose in which folder the document should be uploaded.

When I choose a folder the PickerTreeView.aspx answers really slow.

Example image where the PickerTreeView answers really slow

In this example i've openend a folder with 65 subfolders. The second request is the "click" on the folder I want to choose ("BA-EDV") and it also need's more than 30 seconds.

Do you have some advice for me how to speed things up or an explanation why it's so slow?

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