I have a problem with the speed of opening some sites. It started in beta 4.0, and unfortunately survived in the final version. I took video of how to open the website https://forum.ru-board.com/forum.cgi?forum=5 for example. In 3.9 and earlier it opens instantly. The settings and extensions are the same.
Video https://www.youtube.com/watch?v=L3fG1wSJ...e=youtu.be
Video https://www.youtube.com/watch?v=L3fG1wSJ...e=youtu.be