With a responsive site, the browser can select a smaller version of an image file for an iPhone size browser, a medium size file of the same image for an iPad size browser or the larger image file for a computer size browser. If that is correct, how does a Googlebot decide which image to load? Does it load all of them? This can be important because loading time is one of the aspects that Google considers for pagerank.

What is the most efficient way of handling faster loading times with a responsive website? How many different font sizes and picture sizes are optimum for best efficiency? Thanks.

Martin

welcome to forum Martin

In RSD you will not include 3 images, single well optimized image for mobile /desktop is the key.

Don not forget very good description for your image

I am not good at this but you may read some info here

Image publishing guidelines
https://support.google.com/webmasters/answer/114016?hl=en&ref_topic=2370565

Content guidelines
https://support.google.com/webmasters/topic/4598733?hl=en&ref_topic=6001981

Hope you will find it useful.