Currently, if you use an Image block (or any block that has images) inside of a container block that sets a smaller width than the page container, it will not send the correct image size information to the browser, causing it to download much bigger images than it needs.

For example if you set 4 columns with equal widths and images inside each, the image tag width is 4x off, and the browser would be downloading much more data, making page load much slower.