@anon77445132: The tests I did before showed, that kirby does not create the thumbs when they exists. As it should be, kirby delivers the previous generated thumbs. I think the most of the time is required by determining the file-properties by PHP. But as I told before (in previous posts) Iām not familiar with PHP, so I cannot investigate deeper. So I hope you and others can help me.
And as you can see in the graphs attached below, the images for the gallery have a size of a few KiB. The original images are much bigger in size. This is required due to show them in a detailed-view.
@anon77445132, @lukasbestle: For your information the timings at FireFox. FireFox uses the cached files! The page-generation lasts 8007 ms!