How Content Delivery Networks Alleviate Bandwidth Strain on Host Servers

Content delivery networks sit between hosting or origin servers and end users, thereby reducing the cost of data transfer. They cut down on traffic between the servers and the rest of the web. While they generate bandwidth costs for delivering content from their edge servers, their relationships with internet service providers and large scale enable them to negotiate lower bandwidth prices. 

CDNs minimize network hops and deliver content faster because the content is closer to the end users. The server owner ends up paying lower network use charges, which helps them save money. 

CDNs also reduce the load on the server, letting users handle higher traffic on a smaller server, which also saves money. The networks are consistently a part of reliable web hosting packages. 

The data on bandwidth use 

According to Edholm’s Law, internet bandwidth would double every 18 months following developments in semiconductor technology. In the 1980s, the bandwidth and transmission speed of telecommunication network circuits increased due to the use of laser light as a data carrier, which led to communication network bandwidths achieving terabit per second (Tbps) transfers.

In 2024, there were 5.44 billion internet users worldwide, accounting for around two-thirds of the global population. Internet bandwidth increased by 23% globally in 2023, representing a further decline from the pandemic-induced bump of 2020. While the exact global bandwidth varies and grows year by year, it is not infinite. The total global internet bandwidth was estimated at around 997 Tbps in 2023, significantly higher than in previous years. The total internet bandwidth in 2024 globally is 1,217 Tbps.

The bandwidth of individual links, such as submarine cables, has a physical limit due to the materials and technology used. Congestion can occur if demand exceeds capacity in specific locations, even if global bandwidth is theoretically adequate. This makes CDNs all the more critical.  

Bandwidth and latency reduction

CDNs reduce latency, which is the time it takes for webpages to load. They reduce page load times and help optimize browsing by moving and holding website content closer to the users. Let’s say a business or cloud gaming platform provides video streaming services. Their data centers might be in LA or NYC, but they have consumers and users all over the world. Without a CDN, users in the Philippines or Indonesia would have to download the video content every time, resulting in delays and a poor user experience. 

Placing the focus on user satisfaction 

The geographic distance between the end user and the web server makes a big difference at the end of the day. CDNs minimize this distance and optimize the user experience. This affects business revenue directly as unsatisfied customers and users are quick to abandon a company in favor of its competitors. As of 2024, 83% of internet users expect websites to load in three seconds at most, and 40% will bounce from a website that takes longer than that to load.

Regular vs. video CDNs

A regular CDN handles different types of content, but a video CDN alleviates bandwidth strain specifically in terms of video content, whether VODs or live streams. The buffering time should be as short as possible, and playback must be uninterrupted. Video CDNs fulfill these demands by incorporating specific features and tools tailored to video streaming’s unique requirements.

Video CDNs use adaptive bitrate streaming to optimize bandwidth usage. This involves dynamic stream quality adjustments based on the user’s available bandwidth, guaranteeing an uninterrupted playback experience and minimal bandwidth consumption. It can help content providers save money, especially when delivering content to viewers all over the world.