Slow time-to-first-byte

How to fix it

Add caching at the CDN and origin, optimise the slowest backend handler, and move static assets to a CDN.

Sibling checks in this category

• Slow page response - Total response time is high. Slow pages cost rankings and conversions.
• Oversized HTML - The HTML payload is unusually large, slowing parsing and hurting Core Web Vitals.
• No HTTP compression - The response is not gzip / br compressed, wasting bandwidth and slowing time-to-first-byte for clients.

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