Very long loading time of user blocks
When I open the editing of a page, I have very long loading time of user blocks (blocks that you can save and insert in articles, I don't know how they are called in English) in backend. In frontend all is okay. Loading of these blocks also slows the loading of the tag tool in the right panel. This problem appears only if wpForo plugin activated. I tried to deactivate all plugins: even if only wpForo activated, I have this problem, if it's deactivated, all is OK, not depending on all other plugins activated or no.
Is there any way to fix it?
UPD: I see this problem only on pages. They also update (if I edit and press update) for a quite long time, at the same time posts haven't this problem. The problem appears only if wpForo enabled.
UPD №2: I see this problem only on Google Chrome browser v 79.0.3945.130 (last version) only on my prod site. On clear installation is much faster. Don't see this problem on Yandex Browser, but there is some connection with wpForo because the problem appears only if it enabled...