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.