It seems that anytime someone has an issue , someone else will say, "clear your cache". Well lets look at what happens when you login with a full cache first, then we will compare it to logging in with an empty cache. You login and the viewer says, oh we need this texture, that one and that one,, and so on, lets grab them from the cache,, and then applies them. Then the textures render (rez) for you. Simple enough, right? Okay so lets look at what happens when your cache is empty. You login and the viewer says, oh we need this texture, that one and that one,, and so on, lets grab them from the cache,,oops they aren't there. then it asks the server for them adds them to the cache and applies them. Not only does this take more time but also uses bandwidth both on your end and server side. This is not to say there are times you should clear your cache, but doing so on a regular basis, or when it is not needed is just a bad idea.