I've been having an annoying problem with MC & an infrared wireless keyboard, and finally resolved it in a surprising way.
Basically I use an Acer Airkey III, it's an infrared wireless keyboard with built-in pointing device. It plugs into the PS/2 mouse & keyboard ports.
Under most applications, it is quite fast & responsive. However, with MC the mouse cursor would move very slowly, and mouse clicks & keystrokes would often not be recognized. CPU utilization was low, no other programs running. A particularly strange point is that responsiveness would *improve* when MC actually had another window open, such as as iPod sync or audio analysis windows.
After trying a bunch of things, I was on the verge of doing a reformat and reinstall (which I'd already done before). I took a screenshot of the problem situation. I was looking at the *screenshot* when I noticed that the mouse cursor was moving slowly and jerkily. Note that MC wasn't running at all - I was just looking at a *picture* of an MC9 screen!
Changing the skin on MC to PixOS or Z got rid of the responsiveness problem altogether.
So it seems that the actual display on the screen was interfering with the IR receiver! I'm using a large plasma screen, there is a lot of glass in my apt, so some reflections were getting back to it. I'm guessing that something in the Blue Steel skin is causing a signal that affects the IR receiver. I'm guessing the pattern in the scroll bars - lots of tightly spaced vertical lines.
Very weird - but at least everything is working.