Here's a video made using Opus 11.5.5 on a virtual machine with default configuration. (I also get the same results on my real machine with my custom config.)
I just realised there was only one window open when I recorded the video. I've done the same test with 20 windows open and had the same results. (Can re-upload a new video if you need to confirm that.)
This archive contains the full set of folders I used for testing, which was based on the sample folder names you sent earlier.
Simulation_folders.7z (9.53 KB)
We have not been able to reproduce any of the freezes you are seeing. As you can see in the video, the renames are always processed almost immediately, at all levels in the tree.
Please let me know if you watch the video and can see anything that I am doing which may be different to your setup, or the actions needed to reproduce the problem.
If we're both doing the same things, then the issue may be in something outside of Opus itself. For example, shell extensions called to get icons for the folder tree, or various details in the file display, whenever you click on different folders and when folders are renamed. If one of those is freezing whenever Opus asks it to do normal things, then that could be the cause of the problem you are seeing.
I'd recommend using ShellExView to disable all non-Microsoft, non-Opus shell extensions, then fully exit Opus (via File / Exit Directory Opus; don't just close the window), then re-load Opus and see if the problem persists.
Things like anti-virus can also be a factor.
If any network drives or junctions are involved then they can also complicate things and are worth bringing up.