A good rule of thumb to keep in mind is that file sizes of 10K or less per Website page will cut down on the waiting time. That's 10K total for all graphics on each page. Using larger graphics files generally results in a terrible first impression for Website visitors. The server is the computer on which your Website resides. The server may belong to your firm or it may belong to your service provider.
Many servers are terribly overburdened, and therefore responsible for slowness in Website response.
Yet the only performance evaluation that matters is a user's. Your service provider should be able to give you routine evaluations of the performance of a Website generated from a location away from the core hardware. Make sure that these evaluations of server performance are presented to you in language that you understand. Information Design Information design is the art and science of ensuring that your message is communicated to the user without being a burden. Information design includes laying out the information that the user wants in a way that makes it very easy to get.