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We've just had a problem with sites loading slowly/not at all and I had no idea where to start looking for the problem.
And you can google for "problem solving" to get some ideas on where to start. The general strategy of narrowing down the problem is almost always applicable at the beginning.
For example, if I had a site loading slowly, I would want to rule in or out network problems. If I can log in directly to the server, use lynx to browse the site directly with no slowdown even though it's slow to external clients, then I've probably ruled out a great many things that can go wrong with server configuration. OTOH, if a local lynx browser sees the same slowdown, then I've probably ruled out a great many things that can go wrong between the client and the server's NIC card.