August Capital has led a $40 million Series C financing of Fastly, a content delivery network provider. Fastly has now raised about $56 million in VC since early 2011. It raised its penultimate round, a $10.7 million Series B funding, at a valuation of almost $52 million in 2013. Also participating in the new round were return investors Battery Ventures, O'Reilly AlphaTech Ventures and Amplify Partners, as well as new investor IDG Ventures. Fastly's technology gives businesses control over how their content is served, access to real-time performance analytics and the ability to cache frequently changing content.