One one of the best ways to lose a site visitor is to have slow opening web pages
One of the best ways to create such undesirable pages is to have images that have not been optimised!
In our first photo we have an original image from a digital camera.
The second has been optimised for the web.
They may look similar but they are not - check out the specs.
1 MB is 1000KB in decimal & 1,024KB in binary.