As I recently got the portaudio JACK output driver to start up, I see very heavy CPU usage and hear lots of crackles and pops when I initiate a call. I start up pjsua with a JACK module and everything is running fine. I then connect to a server and the CPU load sky rockets to 99%, making the system very unresponsive and making it hard to kill pjsua. I also hear lots of audio drop outs. In the terminal I see a whole bunch of messages, like these: 22:36:45.682 strm0x82aa9e4 JB shrinking 1 frame(s), size=16 22:36:46.066 strm0x82aa9e4 Jitter buffer empty (prefetch=14) 22:36:46.173 strm0x82aa9e4 jb updated(2), prefetch=14, size=17 22:36:46.173 strm0x82aa9e4 JB shrinking 1 frame(s), size=16 22:36:46.300 strm0x82aa9e4 JB shrinking 1 frame(s), size=16 22:36:47.665 strm0x82aa9e4 Jitter buffer empty (prefetch=14) 22:36:47.750 strm0x82aa9e4 jb updated(2), prefetch=14, size=16 22:36:47.899 strm0x82aa9e4 JB shrinking 1 frame(s), size=16 22:36:49.274 strm0x82aa9e4 Jitter buffer empty (prefetch=14) 22:36:49.330 strm0x82aa9e4 jb updated(2), prefetch=14, size=15 22:36:53.361 strm0x82aa9e4 jb updated(1), prefetch=13, size=16 22:36:53.361 strm0x82aa9e4 JB shrinking 1 frame(s), size=15 22:36:55.798 strm0x82aa9e4 Lost frame recovered 22:36:55.817 strm0x82aa9e4 Lost frame recovered 22:36:55.835 strm0x82aa9e4 Lost frame recovered 22:36:55.877 strm0x82aa9e4 Lost frame recovered 22:36:57.456 strm0x82aa9e4 jb updated(1), prefetch=12, size=14 22:36:57.498 strm0x82aa9e4 JB shrinking 1 frame(s), size=14 22:37:00.784 strm0x82aa9e4 Jitter buffer empty (prefetch=12) 22:37:00.805 strm0x82aa9e4 jb updated(2), prefetch=14, size=15 I also tried using the --play-file command and the same thing happens here. The CPU load jumps to a high level when I connect the file to the device with the cc command and drops when I disconnect with the cd command. I'm also using wengophone with portaudio/JACK and it works close to perfect. Any pointers as to what I can try?. -- Esben Stien is b0ef at e s a http://www. s t n m irc://irc. b - i . e/%23contact sip:b0ef@ e e jid:b0ef@ n n