Massive problem with new "Folder" feature of version 8

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Hello,

Last weekend I upgraded my website to version 8.10 because I was looking forward to the new folder feature. My website has about 2000 images, and yesterday I wanted to sort the images in folders. So I created some folders and moved 4 images to a folder.

Then I waited...... 5 MINUTES!! I tried another one and had to wait again about 5 minutes!!

Has anybody an idea, why that takes so long??

I looked in the mysql processlist and saw a lot of queries like this:
update TreeNodes set treeNodeDisplayOrder = 'xxxx' where treeNodeID = 'yyyy'

I hope somebody can help me, because otherwise that feature is completly useless for me..

Cheers
Harald

HarryVienna