A content delivery network is a group of servers strategically placed around the world. They are primarily used to cache and deliver web content faster. When you create a website you must have an 'origin server' in other words, a place where all of your website’s files are stored. When someone makes a request to your site, their request goes to the origin server and then the origin server sends a response back to the client. The further away a client is from the origin server, the longer it will take for them to receive the content they requested. That’s where the benefit of using a Content Delivery Network comes in. A CDN uses its collection of edge servers to cache (temporarily store) a website’s static content on servers that are closer to your users. Therefore, when a user makes a request for an asset on your site, they’ll be routed to the nearest CDN edge server instead of your origin server, thus decreasing latency.

Yes, you can. You can chose to deliver different kind of content over different CDNs. For instance, it's a common practice to deliver dynamic content over one CDN and static assets over another.

To achieve optimal page load times, you need to optimize your images. This optimization calls for a responsive image strategy and can benefit from on-server image compression, auto-picking the best format and responsive resizing. What matters is that you deliver the correctly sized image to the proper device in the proper resolution as fast as possible. Dorabase CDN comes with built-in image optimization tool.

You can use Google Lighthouse. It is an open-source, automated tool for improving the quality of web pages. You can run it against any web page, public or requiring authentication. It has audits for performance, accessibility, progressive web apps, SEO and more.