I tried to open a directory with 8113 photos (34 MB in total). This seems to take a really long time but the worst part is that the UI is completely unresponsive. Please at least show some sort of progress meter.
It has now spent 36 minutes and is at image 5949 according to gdb. xzgv generated thumbnails for all files in the directory in just 1.5 minutes. I suspect there's some performance bottleneck in ristoretto somewhere. Can you reproduce this behavior?
I can reproduce this behavior with the latest version from git repo. I'm going to fix this.
*** This bug has been marked as a duplicate of bug 6677 ***