Using a CDN, Web Performance February 2, 2016 by Matt Simpson

7 Reasons to Use a CDN for Your Images

When Uploadcare’s customers upload their pictures to a server, they expect to access them from anywhere, on any device, at any time without glitches or delays. The same applies to pictures you upload yourself, for example, product images on your ecommerce site. A Content Delivery Network (CDN) is the best way to meet these customer expectations. But what is a CDN?

A CDN is an alternative to the standard website model by which a website stores all its files on a single server — in effect, a single physical device in a specific location. How a CDN works is by storing copies of the files on multiple servers worldwide, sometimes known as nodes or edge servers. This speed makes a major difference to your customer base: fewer people clicking away in frustration and more people returning again and even paying for premium services.

Sites and mobile apps can use a CDN for all sorts of Web services, for example, a WordPress CDN for blogging or a jQuery CDN for JavaScript sites. Here are seven reasons why a CDN is particularly suitable for image hosting.

1. Speed

By using a CDN, a site owner can make sure customers receive the file from a server located as geographically close to them as possible. This can not only cut the distance the file physically travels but also the number of steps and relays it takes, both of which significantly increase the speed of delivery. That’s particularly relevant with image files: they are big enough that speed is a significant factor but small enough that website users expect them to load without a noticeable delay. We built a tool for analyzing image performance and optimizing it; this can be a good starting point in understanding how images affect page-load times.

2. Hosting Options

With the standard Web model, choosing Web hosting can be a dilemma. A site owner may want to use the main Web server in a specific part of the world for various reasons. The problem is that many of the site’s users may be located elsewhere in the world, meaning more chance of slow access speeds. With a CDN, it’s easier to choose the main server and host that suits one’s needs.

3. Reliability

The very nature of a CDN means that it offers redundancy. There’s always a risk that a Web server will experience problems, either through physical damage or software glitches. With CDNs, if one node is unavailable, the network automatically reconfigures to deliver the data from the next most appropriate node to the user.

Indeed, the more images a site hosts, the more likely it is that millions of people will view one of them, even if only for a few hours. With a traditional single-server model, the surge in demand can knock a site offline. But with a CDN, the network can automatically spread the load by redirecting requests for the image across multiple CDN servers.

4. Conversion

A CDN’s setup not only means customers can load images faster, but the spreading of the load means there’s less pressure to compromise by using low-quality images. Being able to retrieve razor-sharp images will almost instantly impress customers and make them more likely to purchase any paid products or services you offer. Proper image manipulation can also contribute significantly to speed. If you are perfecting your CDN, you may also want to consider a strategy for image resizing. At Uploadcare, we automatically resize user images via our CDN API.

5. Scalability

Many computing services have two major problems as an online business grows. The first happens when the site outgrows its current setup, but the business itself is not ready to move to the next level. The second is that changing a setup can be time-consuming, making it difficult to react quickly to sudden business booms. Fortunately, the best CDN services avoid both problems: most providers can simply “plug in” to an extra node as needed, with only an incremental cost and without any delay.

6. Security

Some clients use CDN solutions to handle confidential and sensitive data, which means providers need to offer top-level cyberdefense against hacking attempts. These measures are usually applied systemwide, meaning that every customer benefits.

7. Denial-of-Service Attacks

There’s always a chance that one of the visitor-uploaded images hosted on a site will offend somebody. That creates the risk of so-called hacktivists hitting the site with a denial-of-service attack in which thousands of computers flood it with bogus requests to try to make it unavailable for legitimate users. It’s even possible that some of your less scrupulous competitors might take similar action to try to bring you down. Such attacks can be tricky to handle with a single Web server, but a CDN structure is much better placed to spread the load and ride out the attack.

The Bottom Line

The worst thing in any network, be it computing or business, is a single point of failure. Using a CDN gives you added protection while retaining flexibility. It’s the online equivalent to wearing chain mail, armor, and a bullet-proof vest while still being able to win a decathlon.

At Uploadcare, we pride ourselves on our CDN strategy, and we hope the information above can help you on your own path to faster delivery!

The CDN designes for handling images
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