Consider vanilla JS

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Frameworks tend to incur a difficult-to-decrease overhead in file size, and in rendering time.

Try to not use any

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Note that the JS is impacted by the choice of server-side rendering vs client-side rendering.

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Possible strategy to balance high-performance, SEO, lightness : For the rendering of an "idiom detail" page

• Render server-side minimalistic HTML having title, meta, idiom statement, selected implementation
• Inline minimalistic CSS for layout and primary colors
• Consider inlining minimalistic JS for interactivity (only if really useful)
• Lazy load and lazy render everything else

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Optionally, consider sever-side rendering of several implementations for the same language, when they exist.