Editing large text documents with Qt Quick TextEdit is really slow

import QtQuick 2.0

Flickable {
        width:600
        height :500


    contentHeight: tt.implicitHeight
    contentWidth: tt.implicitWidth
   
   TextEdit {
        id: tt
        width:1000
        height :500
        textFormat: TextEdit.PlainText
    }
}

Running Time	Samples	Self		Symbol Name
4910.0ms   43.8%	4910   43.8%	4910.0	 	QCoreTextFontEngine::boundingBox(unsigned int)
4908.0ms   43.8%	4908   43.8%	0.0	 	 QFontEngine::getGlyphBearings(unsigned int, double*, double*)
4908.0ms   43.8%	4908   43.8%	0.0	 	  QTextLine::layout_helper(int)
4908.0ms   43.8%	4908   43.8%	0.0	 	   QTextLine::setLineWidth(double)
4908.0ms   43.8%	4908   43.8%	0.0	 	    QTextDocumentLayoutPrivate::layoutBlock(QTextBlock const&, int, QTextBlockFormat const&, QTextLayoutStruct*, int, int, QTextBlockFormat const*)
4908.0ms   43.8%	4908   43.8%	0.0	 	     QTextDocumentLayoutPrivate::layoutFlow(QTextFrame::iterator, QTextLayoutStruct*, int, int, QFixed)
4908.0ms   43.8%	4908   43.8%	0.0	 	      QTextDocumentLayoutPrivate::layoutFrame(QTextFrame*, int, int, QFixed, QFixed, QFixed)
4908.0ms   43.8%	4908   43.8%	0.0	 	       QTextDocumentLayoutPrivate::layoutFrame(QTextFrame*, int, int, QFixed)
4908.0ms   43.8%	4908   43.8%	0.0	 	        QTextDocumentLayout::doLayout(int, int, int)
3921.0ms   35.0%	3921   35.0%	0.0	 	         QTextDocumentLayout::idealWidth() const
3921.0ms   35.0%	3921   35.0%	0.0	 	          QQuickTextEdit::updateSize()

Running Time	Samples	Self		Symbol Name
1709.0ms   15.2%	1709   15.2%	1709.0	 	QVector<QPointF>::reallocData(int, int, QFlags<QArrayData::AllocationOption>)
1709.0ms   15.2%	1709   15.2%	0.0	 	 (anonymous namespace)::SelectionEngine::addToSceneGraph(QQuickTextNode*, QQuickText::TextStyle, QColor const&)
1709.0ms   15.2%	1709   15.2%	0.0	 	  QQuickTextNode::addTextDocument(QPointF const&, QTextDocument*, QColor const&, QQuickText::TextStyle, QColor const&, QColor const&, QColor const&, QColor const&, int, int)
1709.0ms   15.2%	1709   15.2%	0.0	 	   QQuickTextEdit::updatePaintNode(QSGNode*, QQuickItem::UpdatePaintNodeData*)
1709.0ms   15.2%	1709   15.2%	0.0	 	    QQuickWindowPrivate::updateDirtyNode(QQuickItem*)
1709.0ms   15.2%	1709   15.2%	0.0	 	     QQuickWindowPrivate::syncSceneGraph()
1709.0ms   15.2%	1709   15.2%	0.0	 	      QQuickRenderThreadSingleContextWindowManager::run()
1709.0ms   15.2%	1709   15.2%	0.0	 	       QThreadPrivate::start(void*)
0.0ms    0.0%	0    0.0%	0.0	 	        QQuickRenderThreadSingleContextWindowManager::run  0x5bf2d6