The site uses Astro (https://astro.build/) and the code blocks are generated using Shiki (https://shiki.style/). As Shiki generates the HTML and CSS at build-time instead of requiring runtime JS like alternatives like Prism (https://prismjs.com/#basic-usage), it's actually quite performant. I think it's unlikely that a couple of hundred lines with some empty spans in is going to cause performance issues – imo it's more likely to come from some silly JS somewhere.
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