I noted a couple of weeks ago that I make occasional use of .Mac's iDisk. I had been working on a project in Xcode last night—just going through the examples in Aaron Hillegass's 3rd edition of ‘Cocoa Programming for Mac OS X’, so nothing I had put under revision control or anything. Just because it seemed convenient, I figured I would copy it onto my iDisk, and copy it back down to my laptop at work. Opening the remote iDisk in the Finder was taking an age for the new project directory. I tried the web interface, which at least showed the directory tree at a reasonable speed, but I couldn't see a way to download an entire folder. Finally, I tried turning on the local copy feature from .Mac preferences. The sync didn't even complete, showing me a host of dialogs like this one:
I gather I'm not the first person to notice this, as Googling for ‘.mac idisk slow’ brings up 72,000 hits, some of which date back to 2001.