are we using the d3.js in package.json? Are we using the node module?
are we using the minified d3.js in the source code?
stick with one or the other.
if we are using an outdated version. What would it take to upgrade to the latest version? Would it be worth the benefits? We may be able to reduce the size of JavaScript it loads making the site load quicker. Unsure if there are any performance improvements.