Ive got some questions about a new wordpress site I've been setting up and that has been running for a while now. Everything works great but I have on little problem I can't seem to tackle. When I enable caching (which plugin I use to enable caching doesn't matter) the loading of the site doesn't really speed up. When I visit the site and debug it using Firebug I can see that an internal server error is generated with pingback from xmlrpc.php file.
Can someone give me a pointer on how to fix this? What exactly is going wrong and how can I solve this. The site concerned is:
this one
Thanks a lot in advance!
Kind regards