From Medium:

Make no mistake, speed impacts the bottom line. Research from Google and others demonstrates that delays of milliseconds have long-term negative impacts on revenue. If people click on an Etsy seller’s shop and perceive images loading slowly, they will click away, and that seller will lose the sale. This isn’t just about a high-bandwidth service such as video. It’s about any business that depends on the Internet to reach consumers, including the entrepreneurs on Etsy.