preview in dolphin is slow with many pictures

[Mathias Kraus]

Hi,

I have a folder with thousands of pictures (comics from sinfest.net, it's 
addictive) in it and if I open that folder with preview enabled, dolphin is 
extremely slow and tries to create all the thumbnails for the pictures. If I 
open the folder with gwenview, it feels very fast, because only the thumbnails 
for the pictures that are in the window are created.
Is it possible to do it in dolphin the same way and shall a fill a report on 
b.k.o?

Thanks, Mathias