seen https://doc.qt.io/qt-5/qxyseries.html#replace-5 ? even if you are doing it just for one point - by destroying and creating a series over and over you do this anyhow. has to be quicker/better. I belive that also invokes https://doc.qt.io/qt-5/qxyseries.html#pointsReplaced ChartView should handle redraw and everything for you.

I'd recommend using https://doc.qt.io/qt-5.10/qxyseries.html#replace-5 Replacing points one by one destroys a cpu. The metrics for me was just not even worth measuring - it was just an immediate hell no - forget that - I need faster updates. I like declarative QML for gui as a preference but calling replace on a single point fires way too many signals and takes way too long. I throw my QML LineSeries to a QXYSeries and call replace in c++ In the future I'll probably just declare my series in C++. I wish I could have a better supported hybrid of c++ and QML charts but I have this working very fast using useOpenGL : true; (you can also c++ setUseOpenGL(true) )

When using line series, we've had severe performance problems. We end up with thousands of series to handle all of the gaps and have to create parallel scatter series because we want icons for each point that aren't part of the standard icon set. We pay a huge cost both constructing and destructing the series. Seems like it may be refreshing on each add series, but even removeAllSeries is slow. Have tried many things to suspend the painting, but with no timing effect. Any ideas on how to have many gaps without destroying performance?

I found a solution and post it here: link

Super :) oh it must have "()" on. The syntax is pretty funky via the automation server. Good work.

You're welcome ! Since you have it working now, please mark the thread as solved using the "Topic Tools" button so that other forum users may know a solution has been found :)

@corianderop Hi I am also stuck in a similar situation did you figure out a solution for it ?