Resolved: I have made further tests, and my final conclusion is that the previous stated test results were screwed by the application 'gentones'. This application does in some cases send more rtp than expected. If I used: <action application="gentones" data="%(5,0,300)"/> <action application="gentones" data="%(5,0,300)"/> <action application="gentones" data="%(60000,0,300)"/> the expected rtp of 8600 kB/s was transmitted. If I used <action application="gentones" data="%(60000,0,300)"/> <action application="gentones" data="%(5,0,300)"/> <action application="gentones" data="%(5,0,300)"/>. the rtp was 34600 kB/s, and the memory is heavily consumed. The only difference being the sequence of the gentones commands. I don't know if this is the expected behaviour of 'gentones' or not, but it certainly screwed up the results previously posted. /Jon