WebP — first announced by Google in 2010 — is an open image format based on the VP8 video format and is a more efficient alternative to PNG, JPEG and GIF.
In general you can expect a 25–35% size reduction in images converted to WebP, but in real-world usage you can often see reduction of up to 90% without visible quality loss.
Dynamic rendering (and dynamic serving) is a technique where a web server, web app or website renders and serves its content in a form most discernable to the visitor.
In the context of SEO (Search Engine Optimization) and SMO (Social Media Optimization), dynamic rendering involves serving a statically rendered version of a page to search engines and social media bots in order to improve indexability.
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