Hello Narcis, thank you for the reply. Autorepaint=false is already set, the series is only repainted, when an interval x ms is elapsed, not every time data was added. I get the same bad performance if I make a simple sample project with a timer which repeatedly generates 100-1000 random values, add...

Hello, I am developing a medical application which _must_ update the collected data at least every 50ms, 40ms would be appreciated. At the moment I made an approach using FastLine series. The data is gathered in a second thread and fast enough, so the main-thread (GUI) only has to refresh the screen...