XnView Software

Strange, i have no delay even with big folders. Do you have a lot of files in each folder?

There are between a couple dozen and a few hundred files in each, and the parent folder has a couple hundred of these. Scanning all of these is always going to be slow (which is why Explorer doesn't do that ...

The directory browser is very slow, probably because it scans each directory's contents to see if it should display the + in the tree. Simply scrolling through large directories thrashes painfully, even on a modern system with a fast drive (often freezing the UI for ten seconds or more and thrashing ...