Best image serving/CDN on the market

Sirv is fantastic! I have a lot of images on my website, and most of them are large, which resulted in slow site speeds, even with a CDN. What I love about Sirv is that they offer a CDN service, but also dynamically resize images based on the user’s browser/device, and serve the right file type. It has meant HUGE speed improvements on my website. In addition to this, their WordPress plug-in works a treat. I was worried about having to move my entire media library to Sirv myself, but the plug-in automates this process without any glitches. Support team is also very responsive and fast. Highly recommended!