also, most offensive is the use of 3rd party js hosting. given the tiny size of the 3rd party libraries (relative to 1st party code), add them in to the code from your own site (which you're already bundling up. SMH)
[from jsdelivr.net]
polyfill.min.js (31.8kb/96.8kb) (wire/resource)
url-polyfill.min.js (1.9kb/6.1kb)
react.production.min.js (4.7kb/12.3kb)
react-dom.production.min.js (36kb/116kb)
[from liaison.dev]
bundle.a7c7d78d57.immutable.js (108kb/375kb)
actual website code: https://github.com/liaisonjs/liaison/tree/master/website