I've just noticed that in the admin interface (wp-admin) there is in each page this part at the end of the page:
<iframe id="pingcheck" src="http://readmaniac.pbworks.net/wp-admin/execute-pings.php?time=1149590406" style="border:none;width:1px;height:1px;"></iframe>
execute-pings.php slows down each admin page.
Wouldn't it be better to ping the update services only after an article is written? Or give the admin also the option to ping manually?
I think it's a bug also the fact that the execute-pings.php is called (and slows down my site) even if I have no update service configured (I got rid of the pingmatic server).
The only way I found to make the admin interface fast as it is supposed to be was to adblock the url /wp-admin/execute-pings.php