User experience (UX) is important to both SEO and search engine algorithms.
Using images effectively is key to supporting content and improving user experience. It also helps with SEO by adding further relevancy signals to a webpage and enhancing the message of the page for search engines. Image optimization has a significant impact on website speed, as pages that load slowly are more likely to drop in the SERPs and lose potential traffic. Improperly sized images are often the culprits, so make sure to size them appropriately.