Downloaded a couple of photos from Google with that resolution, sizes are 2, 10 and 20MB. Will test later.
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So far no issues on a RPi-2 box as well as an Intel Generic Box, both are on 7.90.010.
On the RPi-2 the pics do take time to load, and the transitions are slow in a slideshow, but no hiccups or freezes here.
Sorry for the delay, but I check the problem twice. It seems that I have found the solution for my problem.
Everything works fine, if all thumbnails in the desired directory are created and I see not only the name of the photo but the name and the thumbnail. If the thumnail exists I can see the photo on the TV. If no thumbnails exists and I select such a photo, the screen of the TV becames black, KODI goes offline and then follows a restart of KODI.
I have directories with hundred or more with this large photos, so it takes a while to generate all this thumbnails.
Thank you for your effort!
Best regards
Udo