Qt 5.15 WebEngineView page loading is slower in times than 5.14

You can check this simple example on 5.14 and 5.15. In 5.15 loading of webengineview page is slower in times than 5.14. If doesn't matter it is in QML or C++ QWebEngineView.

You can check also with quicknanobrowser example, loading of https://www.qt.io/ is extremely slow, comparing to 5.14