Hello Peter,
in one of my sites where i had plugin "module in content" installed, which you have now declared obsolete, it seems the plugin checks with your website for every admin page access, and then a tooltip says it is out of date.
the effect of this is *extremely* slow admin access ( up to 10 seconds response time ) for each and every admin page access in joomla, as they all must go through the same online version check.
uninstalling the plugin solves the problem.
i am posting this here in case some people out there are having fights with their hosts over 'extremely slow connection speeds'.
in general, it is not recommended to program this way. it can propagate delays.
given that you are a very helpful and kind person

, i would go only go as far as to mention this incidence for other. i will save you the three days of swearing at my host

lol.
that's it, have a nice day.