Eric,
If you want to optimize speex, I'd suggest the following:
1) Re-compile the speex library with SSE optimizations; add --enable-sse to the configure line used for compilation.
2) Reduce the "complexity" from 4, to 2 or 3 in codecs.conf. You won't notice the difference in quality.
3) Lower bitrates use less CPU; try setting abr to 8000, which is a good all-around choice; it gives you an average of 8kbps usage, but can range from 2-3kbps to 16 kbps or so during simple/complex speech parts.
-SteveK
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