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From: Richard Stallman <rms@gnu.org>
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Subject: Re: Native play function slows down emacs on RH 7.3
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    If you use the built-in play-sound function, 
    things feel  slower than when using (shell-command "play "...)

    It's hard to articulate the "feel slower" bit --
    but at least when I switched emacspeak to start using play-sound,
    the rest of emacs felt sluggish.

Can you investigate a little--by seeing what method Emacs uses to play
a sound, and what method the `play' program uses?  Maybe we're not
using the best method, or we might be using it wrong.

Unfortunately I know next to nothing about the facilities for playing
sound.