Probably the simplest thing you can do to speed your page load times is to compress your images. Compressor.io is a great resource for this. Go to their page and upload your image and they’ll quickly compress it for you and you can download an image often a third the size of your original with usually no visible degradation of the image.
If you’re editing your own WordPress site, you can add a optimizer plugin like WP SuperCache. Setup is fairly simple. Check with your host for their recommendations. InMotion Hosting has a very helpful page on this setup.
To compare your page load times, as you modify your site, check out GTMatrix.