@johngod This is a great reference. I will check the code and compare what I am doing wrrong here.
Thank you so much.

Same issue, I have also got this cmake warning:

-- qmlplugindump failed for org.kde.quickcharts. -- Could NOT find org.kde.quickcharts-QMLModule (missing: org.kde.quickcharts-QMLModule_FOUND) The qml plugin 'QuickChartsplugin' is a dependency of 'project', but the link target it defines (KF6::QuickChartsplugin) does not exist in the current scope. The plugin will not be linked.

instead of setContextProperty() you should use QML_SINGLETON
see: https://t1p.de/ekkeQML_SINGLETON

@SimpleY i ve got same problem as your, try to go to preferences->Qt Quick->QML/JS editing-> QML Language server and remove tick on Tun on (leave all unchecked)

it worked for me.

@JonB It appears the problem was in my testing after updating the latest code here (Also it was always 10,000 data points, I wrongly wrote it as 1000.. I over-worked this issue. I will mak an edit. ). CPU usage has come down to 18% from 60%. I had done following things-

Moved LineSeries update to backend

LineSeres clear + append is replaced with replace

Qt is upgraded to 6.8.0

I am not sure which one out of this helped but results look better now. Thank you so much everyone who spent their efforts to read my long question and provide amazing ideas. Appreciate it.

I'm minimally familiar with Quick Layouts (anchors FTW!), but the documentation says:

Likewise, when a vertical layout has its preferred height, all child items will have their preferred heights, and when a vertical layout has its maximum height, all child items will have their maximum heights. This strategy is applied regardless of what the individual stretch factors are. As a consequence of this, stretch factors will only determine the growth rate of child items between the preferredHeight and maximumHeight range.

Setting Layout.preferredHeight, or the item's implicitHeight, enables use of the verticalStretchFactor.

@Joshika_Namani Which version of Qt do you use? I think that using Qt6 is a better option but here is a doc for Qt5 https://doc.qt.io/qt-5/qopenglwidget.html if you want to see.

I forgot to mentioned this ,I am Using TextInputUnit as component ,
here is the TextInputUnit.qml , i have added the Font.AllUppercase
TextInput {
id: textInput
text: value
focus: true
anchors.top: parent.top
anchors.left: parent.left
anchors.bottom: parent.bottom
anchors.leftMargin: 10
anchors.right: unitsRect.left
verticalAlignment: Text.AlignVCenter
color: '#EBF4FF'
font.family: 'Lato'
font.pixelSize: 16
font.capitalization: Font.AllUppercase

selectByMouse: true

// validator: validatorIn
onEditingFinished: {
root.textChanged()
}
readOnly: readonly
}

but still its not working . What will be the issue

Hi @dheerendra

I think the issue was in NO_PLUGIN as were suggested by @Anumas here:
https://forum.qt.io/post/802964

Seems to be working fine with static library now. I marked that message as a solution.

Would i be viable to use qt widgets and just use qtquick for all the other widgets embedded into the qt widgets mainwindow or is this a bad idea?