The difference is that all you have to do to view this is punch a URL into a browser, on virtually any computer in any form factor, and it's on your screen inst

The difference is that all you have to do to view this is punch a URL into a browser, on virtually any computer in any form factor, and it's on your screen instantly with absolutely zero setup. Of course there's a performance cost to this incredible convenience. Imagine if the author had instead used, say, DirectX and C++ and only bothered compiling it for his own platform. Not only would it be nearly impossible for this to have reached the same audience so quickly, but it likely would have taken the author longer to make as well because JavaScript + D3.js are uniquely suited towards rapidly making these sorts of prototypes.