Hi.

We're experiencing performance issues. We have a customized plot, that is derived from QwtPlot, which receives data every second. Our plot has a history of 60seconds, on the x-axis.

Worst case scenario is 25 curves, with 1500 points per curve, so maximum 37 500 points per second. We've also tried upping the update interval to 4 seconds, with more or less same result.

After some seconds we're experiencing high cpu-load up to 100 %, and we're not quite sure how to improve that. From what I've read 37500 points shouldn't be that much compared to other plotting scenarios.

We're running Ubuntu 11.10, and using Qwt 6.0.1.

Basically we've run out of ideas on what might cause the performance degrading, and would like som pointers on where to start looking if anyone has got any tips to where to start.