Dropbox, the file storage company that last year moved 90 percent of its data out of Amazon Web Services cloud and into its own data centers, is at it again. From a report on Fortune: The San Francisco company is building its own international private network to make sure users abroad can access their files -- most of which reside in those aforementioned Dropbox U.S. data centers -- faster. "What people don't realize about the internet is that it is very 'bursty' and can hit bottlenecks," Akhil Gupta, vice president of engineering at Dropbox tells Fortune. That is why the company is ripping out third-party load balancers and replacing them with its own software running on standard Linux hardware. Insulating itself from the balky internet is also the reason Dropbox is contracting to use its own dedicated fiber cable to carry that traffic. "We want to make user experience as real time as possible since 70 percent of our users are outside the U.S. and most of the data lives in North America," says Dan Williams, Dropbox's head of production engineering. Dropbox still partners with Amazon for customers in some countries, like Germany, which require user data to stay in the country of origin.