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Haven't deployed it yet, but if you're interested you can take a look at staging.samwho.dev to see the work I've been doing on my site. The numbers are looking good (this is compared against a deployment at old.samwho.dev from just after /big-o was published.)

Not really any great secrets here, a lot of the old pages were just dumb. I was including large deps that I only needed for some small purpose. Some of them I was able to replace with DIY code, some I could use a smaller version of the dependency.

I also discovered with nginx you can precompress assets and it'll serve them from disk, so on deploy now I create gzip and brotli versions of everything at the highest possible compression settings so shave off a few percent more of the bundles.

On top of that I noticed my site was using HTTP/1 and I hadn't configured HTTP/2 or /3, derp.

A lot of the increases in accessibility score came from better contrast on text and visuals. I now have automated tests ensuring I maintain 4.5:1 contrast ratios on my smaller text, and 3:1 on larger. I've gone through and had a go at a better set of colour tokens for the site.

This is a tangent, but I appreciate your clear explanations and elegant visuals of topics other tutorials overcomplicate. I’d like to see how you are testing for contrast ratio. That seems like a great check.