Google uses page load time as a factor in their ranking algorithm!
Oversized images take longer to load, so it is important that you keep your images as small as possible. Image Optimizer takes care of each graphic element on your site, processing it to make the page work faster and appear higher in the Google search. Typical compression ranges from 50%-60%.
1¢ per image. Due to the Shopify policy, the minimum payment for an optimization is $0.50.