I guess this might have something to do with none-public tor entry nodes.
Do you use some of these hidden tor entry nodes?
Whonix asks you when using it the first time, what kind of user you are and if you need to use these hidden tor entry nodes. In some countries, where it is not allowed to use Tor, this might be a good thing, but in others, you probably don’t need that.
These hidden entry nodes are very likely to be a little slower than the public ones.
They might have less bandwidth and this might slow down your tor connection.
You will find more information about that in the whonix wiki or Tor website.
Now I have launched the Tor browser on the Host. It started up and two default tabs opened. All was good.
A couple of minutes later I entered other addresses in these browser tabs, but they did not open. I opened another tab and enter the address of another site, but nothing works.
“Problem loading page” - I see such an inscription instead of the site name on the tab.