flash214:

Dunno that we've determined anything yet. rgbyhkr, does yours still lag if you turn the beep volume all the way down? Some devices realize that 0 volume means don't play it, others don't.

The only reason I suggested it is because the RC review of the MX950 mentions that you can't press the button repeatedly as fast if it's emitting a sound. That sounded in line with the Tivo issue rgbyhkr described.

I've not noticed any lag on my (audible) MX950, really, but it's running in IR-only mode right now.