> I have read the Performance pages in the Moodle documentation.
The intro at https://moodle.org/mod/forum/view.php?id=596
has a bit more.
> It's not a question of the server being overworked, as the problem appears when I'm the only one accessing the site.
Just to eliminate the obvious: Are you the 'admin'? Then read https://moodle.org/mod/forum/discuss.php?d=222025#p967483
> (I also spoke to the hosting company, and they don't see any problems.)
On what evidence?
> It doesn't seem to be a database problem either, as the database test page (which runs some thousands of queries) doesn't take much longer than any other page.
> PHP seems to be configured correctly, in accordance with the docs (I had to add a few lines to php5.ini).
Not very informative. Let's assume that PHP is OK.
> As I said, the problem only appears when I'm logged in. When I'm not logged in, the site works fine.
> I'm new to Moodle so I don't know what things change, in terms of the program, when a user logs in, but I was hoping that someone here would recognize this as a known problem.
The general pattern is that the cause is the limited resources of a shared hosting service. 'fcourse you need some sort of a proof. The usual candidates are: