Images (and other media) are the biggest parts of a web page. The bigger the image, the longer it takes to load. At worst, you can see the image build up line by line! And a fast loading page is important. Primarily for your visitors, but also for the search engines… View article here.
Sometimes it can be more convenient to work with WordPress on your own machine. Check out how to install WordPress locally the easy way with DesktopServer. View article here.