Actually the site loads about 4.3 MB of compressed data over the network, or 6.5 MB uncompressed. Edit: out of curiosity, I looked at the package.json of their

Actually the site loads about 4.3 MB of compressed data over the network, or 6.5 MB uncompressed. Edit: out of curiosity, I looked at the package.json of their open source project, there are 51 top-level dependencies. After installing, there's 140 MB of dependencies, or about 800k lines of JS. Quality is fractal.