Picking Assets is painfully slow

Picking assets is very slow when clicking on a folder with many subfolders (containing many assets). "getAssetsInFolder" is called repeatedly, however the time interval between calls is about 15-~100 seconds...

It seems that the performance improvement that we did for the Assets App does not apply when using the asset picker dialog (damLinkField).

Best guess:

The picker dialog tries to iterate into every subfolder and into every asset, presumably to find out, whether it is necessary to show an opening arrow.

Affected version: celum-dam-connector-1.0.3.beta1