It may well be something to do with the latest offering of QT, many changes have been made since 5.15.

I looks like you have solved your problem, what was it?

@costasjames479 I am aware that other styles are available for Qt Quick Controls. However, according to the documentation, the Basic Style is the most performant and platform-compatible, which is why I prefer to use it. With this in mind, how can I figure out what to place as the attribute or property name instead of ? in the following code:

TextField { palette { ?: "blue" ?: "white" } } ComboBox { palette { ?: "blue" ?: "white" } }

In other words, is there a detailed list in the documentation that specifies the name of each attribute, which I might have overlooked?

Don't use anchors for the dot, use a fixed value, something like

Image {
id: dot
width: someWidth
height: someHeight
x: someXPositionRelativeToXBodyImage
y: someYPositionRelativeToYBodyImage
.....
}

@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.

@GrecKo hm thats really a bummer. I have many apps where i drag stuff that where not written with qt but there it's possible without lagging behind. Seems to be poorly implemented in qml than. Anyway thanks for the answer.

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