Make QTextDocument::setHtml() faster

It would be nice if QTextDocument::setHtml() was faster.

For large html documents the function takes a long time to complete.
Consider the following example,
These are the times it takes for the setHtml() to complete when the for-loop has run to make a html string:
500 times -> 2 seconds
1000 times -> 5 seconds
2000 time -> 23 seconds
9000 times -> 497 seconds

#include <QtGui>
#include <QDebug>
#include <QTime>

int main(int argc, char *argv[])
{
QApplication app(argc, argv);

QString html = "";
for (int a=0; a < 1000; a++)

{ html += "<TABLE BORDER=1> <CAPTION>A test table with merged cells</CAPTION> <TR><TH ROWSPAN=2><TH COLSPAN=2>Average <TH ROWSPAN=2>other<BR>category<TH>Misc <TR><TH>height<TH>weight<TR><TH ALIGN=LEFT>males<TD>1.9<TD>0.003 <TR><TH ALIGN=LEFT ROWSPAN=2>females<TD>1.7<TD>0.00</TABLE>"; }

QTime time;
QTextEdit tedit;
tedit.show();
time.start();
tedit.setHtml(html);
qDebug() << time.elapsed();

return app.exec();
}