My site has been feeling very slow of late, and I decided to test its speed using pingdom. What I've noticed anecdotally is that there is a lot of time where my browser is simply waiting for my site to respond, and not actually loading anything. That seems to be confirmed by pingdom's tests, which show 77.4% of my load time being taken up by a "wait" state, as opposed to 10.4% in "receive". Is this normal? How do I improve this? Thanks.