Opening any of the audio properties dialogs takes 2 minutes and 5 seconds every time. There aren't other tasks that take an unreasonable amount of time. It's something specific to the Sound properties dialog. If I restart my computer, it will open immediately for the first day or 2.
It's likely a driver issue. I have an AMD graphics card with sound output (through HDMI), a Realtek audio chip on the motherboard, a USB microphone, and USB headphones. Is there a way to determine which one of these is misbehaving? Or a way to figure out what's holding things up when it's waiting?