Wikipedia: A content delivery network (CDN) is a large distributed system of servers deployed in multiple data centers across the globe in the Internet. The goal of a CDN is to serve blog/website content to end-users with high availability and high performance. CDNs serve a large fraction of the Internet content today, including web objects (text, graphics, URLs and scripts), downloadable objects (media files, software, documents), applications (e-commerce, portals), live streaming media, on-demand streaming media, and social networks.
Why & When to use CDN?
If your website/blog is having good traffic, i would suggest you to use a CDN for improved content delivery performance. These CDNs have several servers around the globe which delivers your website to your visitors from their nearest server which in turn decreases your website load time. These CDNs also has server availability checking features which will keep your website 100% of the time. They can also optimize your content size, decrease your bandwidth usage and reduce server load.
CloudFlare operates out of 23 data centers around the world. Cloudflare CDN automatically caches your static files at their edge nodes so these files are stored closer to your visitors while delivering your dynamic content directly from your web server. CloudFlare then uses a technology called Anycast to route your visitors to the nearest data center. The result is that your website, on average, loads twice as fast for your visitors regardless of where they are located.
On average, a website on CloudFlare loads twice as fast for its visitors, sees 65% fewer requests and saves 60% of bandwidth. You’ll be able to see the exact speed benefits and savings with your personalized CloudFlare analytics report for your site.
CoralCDN is a free and open content distribution network based around peer-to-peer technologies, comprised of a world-wide network of web proxies and nameservers. It allows a user to run a web site that offers high performance and meets huge demand
CoralCDN is simple to use, you just append .nyud.net to the hostname of any URL, and your request for that URL will be handled by CoralCDN. CoralCDN has 260 servers world-wide.
The CoBlitz system was a scalable content distribution network (CDN) on PlanetLab, which focused on transferring large files, such as video and software downloads. Its design was focused around breaking large files into smaller pieces, naming each piece with its own unique name, and then distributing these pieces among a set of cooperating Web proxies. This approach provided natural scalability, and unified the storage, processing power, and bandwidth of a set of cooperating machines.
You add the prefix http://coblitz.codeen.org/ to the URL you want to serve, and CoBlitz does the rest. For example: http://coblitz.codeen.org/YourBlog.com
Through a simple DNS settings change, your website traffic is seamlessly routed through Incapsula’s global network of high-powered servers. Incoming traffic is intelligently profiled in real-time, blocking even the latest web threats. Meanwhile outgoing traffic is accelerated and optimized for faster load times, keeping welcome visitors speeding through.
Incapsula can be used by anyone with a website and their own domain regardless of website platform. It takes less than five minutes to add your website to Incapsula by making a simple DNS switch. There is no hardware or software to install or maintain and you can keep your current hosting provider. Incapsula can be turned off any time as easily as you turned it on.
5.Google Page Speed Services
PageSpeed Service is an online service to automatically speed up loading of your web pages. PageSpeed Service fetches content from your servers, rewrites your pages by applying web performance best practices and serves them to end users via Google’s servers across the globe.
The extent of speed up depends on a variety of factors such as content on your pages, browser, geographic location of access, bandwidth, etc. You can run tests to measure the speed up of your site in a few minutes. PageSpeed Service is currently offered free of charge to a limited set of webmasters during this trial period.
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