QtQuick 2.8 Controls 2.1 TextArea are very-very slow

[Stas Koynov]

I found an old topic (QtQuick 2.0 TextEdit, TextArea, both are very-very slow on high-end PC). But there was no answer in it. I have the same problem. If you insert large text (several thousand lines) into TextArea, it starts blinking (the text disappears \ appears).

How to fix this problem?

System: Win 7 (64 bit) Qt 5.8.0