At the time of writing I have big diffuculties on whatever I do here:
Logging in, Reading posts, submitting post, going back from a post to the table of contents of the board.
I have seen in the last few minutes at least 5 times a page telling me:
Another symptom is, that I have partially to wait several minutes, until a thread gets opened, if I click on it's title. This does happen regardless, if I am logged in or not. Also does the message indicate, that the problem seems to be in the forum's software.General Error
SQL ERROR [ mysql4 ]
Can't connect to local MySQL server through socket '/var/run/mysqld/mysqld.sock' (11) 
An sql error occurred while fetching this page. Please contact an administrator if this problem persists.
But this does not happen every time. I just made a preview for this post and I got it in between a second (as normal). Maybe the server has some hiccup,
Otherwise my Internet connections does not show any special behavior, so I do not believe the problem is on my side.
P.S. I tried to identify the correct board for this thread. If I should be wrong with choosing this one, please give me an advice for the future.