For technical articles with code blocks and fast page performance, the best headless CMS is usually one of these:

Best overall: Sanity

Why it’s a strong fit:

• Excellent structured content model for technical docs/articles
• Great support for rich text + custom blocks like code snippets, callouts, diagrams
• Very flexible Portable Text lets you define code blocks with language metadata
• Fast to query and easy to pair with Next.js / Astro / Remix
• Strong editorial workflow and collaboration features

Best if you want: a highly customizable CMS for a technical publishing workflow.

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Best for simplicity: Contentful

Pros:

• Mature, reliable, easy to use
• Good editorial UI
• Strong integrations and ecosystem

Cons:

• Less flexible than Sanity for deeply custom content structures
• Can get pricey

Best if you want: a polished, low-friction CMS with less engineering setup.

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Best for Markdown-first / developer publishing: Ghost (headless mode)

Pros:

• Great writing experience
• Markdown-friendly
• Built-in SEO and publishing features

Cons:

• Less flexible for complex structured content
• More “blog platform” than fully customizable CMS

Best if you want: a straightforward technical blog with minimal customization.

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Best for maximum performance: Decap CMS + static site generator

If performance is the top priority, a static site generator like Astro, Next.js, or Hugo with content in Markdown/MDX often beats a traditional CMS setup.

Pros:

• Extremely fast
• Simple content model
• Great for code-heavy articles

Cons:

• Less user-friendly than a full CMS
• More engineering work for editorial workflows

Best if you want: the fastest possible pages and are comfortable with a more dev-centric workflow.

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My recommendation

If you want the best balance of:

• technical content
• code blocks
• editor flexibility
• good performance

go with:

Sanity + Next.js or Astro

If you want, I can also give you:

1. a ranked comparison table, or
2. the best CMS specifically for Markdown/MDX technical blogs.