My client is complain that his site is slow at all times, he is on a dedicated server with no other clients. The server has very little overhead. What can I troubleshoot to increase response time. The network is theplanet.com
when i was checking a performance problem recently, this was quite a useful speedtest tool in establishing where exactly it appeared slow from geographically (in my case it was slow everywhere): http://internetsupervision.com/
dunno how accurate it is tbh
are you sure the clients connection is not at fault?