Hello, i want to use SPEEX DSP AEC on Linux 2.6.28.1 for local echo cancellation. I have a tail length of 320 ( only for testing i want to user 1280) I have configured with: ./configure --host=arm-linux --disable-oggtest --with-ogg=no --disable-ogg --enable-fixed-point --disable-vbr Because I don't have a FPU. My Problem ist that the AEC usses 99% of my cpu. Are there any suggestions for me to decrease the cpu load? The other thng is, that I use the asynchronous API. Would it be good for teh perfomance using the sysncrnous api for that. (speex_echo_cancellation(echo_state, input_frame, echo_frame, output_frame);) thanks in advance for you help Best regards Eberhard