Originally Posted by manly

Of course it does. Everytime you do a keypress the game must play the 'spell is not ready' sound. It needs to send the audio file info to the sound card. It needs to call the appropriate classes and send the message to mods that the event 'spell is not ready' has occured. Mods will probably execute LUA code to handle this (mods like errormonster). Then the message 'spell is not ready' needs to be shown on the UI. I think the biggest hit on system performance will be sending multiple audio stream to the sound card, if I were to make a guess. Not to mention that the sound card has a limit to the number of sounds it can play at the same time. If you set the value too high it could be very well possible that you start losing other sounds in the game because all the audio channels are taken.