About a week ago I realized that the file list in µTorrent would hang for less than a second whenever a file with a long Japanese file name was visible. I found it curious, but I didn't really have time to worry about it at the time, especially since it was only limited to µTorrent.
However, today I realized that it is not. If I for example save a text file with a long multibyte character file name and open it in Notepad, I get some strange results. When I try to resize the window, everything slows to a crawl. I can however release my grip on the window and see how my cursor splits in two, one being controlled by me and the other being a sort of "ghost cursor" for lack of a better word that executes the dragging motion I originally made with the mouse. This only applies to filenames of this nature, and I have tested it in applications other than Notepad and µTorrent as well.
I've tried searching for clues as to what is causing this strange behavior, but I cannot find anything. Does anyone here have any idea what's going on?
Unfortunately, I cannot take a screenshot of this as it seems like all screenshot applications hang until the resizing is complete before taking the shot...
Edit: I've recorded a video demonstrating the problem. I'm not sure whether this will help in identifying the cause but it should at least be better than my explanation above:
Edit 2: Here's a sample file as requested: Note that it's simply an empty file with a long multibyte filename: http://goo.gl/bgnGP (And for those of you with a browser which can't handle the filename, here's a zip-file: https://dl.dropbox.com/u/55495248/multibyte.zip)