I used the following code to convert html to plain text:

QTextDocument doc;

doc.setHtml( html);

QString txt= doc.toPlainText();

Things went well until one day the program hang. After debugging, it turns out QTextDocument::setHtml freezes. It is not completely dead but very slow. This is not normal because it worked well in the past. By searching the Internet, the only post I got is this. However, it does not answer why QTextDocument::setHtml is so slow. It seems to load some external resource. Can anybody help me?

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