Hello,, I had the same problem with digikan 5.4. The batch converison worked really slow. But I found an entry in the menu to tell digikam to use all prozessor kernels. And that speeded it up. Now I have the problem again with digikam 5.6 and 5.7. Where can I set digkam up to use all cpus? Thanks in advance for your help. Best regards Ulf