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First troubleshooting steps:
1. Uncheck the option Preferences > Performance > Use Graphics Processor > Use GPU For Export. (It's currently enabled -- "GPU zum Exportieren aktiviert".)
2. You've got a one-year-old graphics driver installed (18.104.22.16812). Go directly to the Nvidia web site and update the driver to the latest version.
3. If steps 1 and 2 don't help, then do Help > System Info again and copy/paste the entire contents here.
Installierte Zusatzmodule: 1) AdobeStock 2) Flickr 3) Helicon Focus Export 4) LogiOptions 5) LRT Export 6 6) Nikon Tether-Zusatzmodul 7) Topaz Photo AI
Try to disable the LogiOptions plugin, it has been known to cause problems in the past. File > Plugin Manager.
If that doesn't help, disable all plugins. If exporting then works properly, enable the plugins one by one, and try to export after each one to identify the faulty plugin.
Another thing to try is to reset the preferences.
"Of course both steps did not work. Why should they???"
It's only in the last couple of versions that LR has started using the graphics processor for export. LR uses graphic processors in ways unlike most other apps, and it frequently encounters bugs in older graphics drivers (and sometimes the most recent versions). When there is a problem with a LR feature that uses the graphics processor, disabling it and/or updating the graphics driver very often (but not always) fixes the problem. (There are hundreds of such reports in this forum.)
In particular, disabling the GPU for export helped at least one person experiencing the symptoms of a long delay before the first photo in a batch export completed:
Your symptoms are somewhat different, with the app freezing after the first photo.
Thanks for your tips. None of them works. I am sure there is something wrong with the update. Why is 11.5 working perfectly well with all the settings I had?
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Finally.... the latest update solved the export lag issue. Thanks
I think I can now at least identify the issue. It seems to be in connection with using image watermarks. When I do not use watermark, the export to JPG is fast. As soon as I use a image as watermark, the export takes 30 sec or more and the application hangs