Do you know that 80 to 90% of the end-user response time is spent downloading all the components in the page? Images, scripts or stylesheets can take a while to be downloaded on the client machine.
A content delivery network (CDN) is a collection of web servers distributed across multiple locations to deliver content more efficiently to users. Although CDNs are pricey for small or non-profit websites, using this solution can really make your site 20% faster. Most well known CDNs are MaxCDN, Amazon CloudFront, CloudFlareand NetDNA.