Performance issue in debug mode for multiple charts in the same windows

I need to display real time data from different sources in the same windows. I used as a reference the Audio example: data come with a signal from another thread and are processed and appended to a new vector, then I replace the entire series. Each chart has multiple series.

In debug mode the program suffers from heavy performance issue. Removing one chart the issue is reduced, while the release build is never afflicted. I tried to duplicated the audio example placing two identical widget in the same windows and noticed the same problem.