Glossary · Delivery and rendering
rate limiting
A server's answer to a client asking too fast, usually HTTP 429, sometimes a silent slowdown. For measurement the honest consequence is unverifiable: a 429 says the client was throttled and nothing about what it would have received. A scanner that records a throttled fetch as a refusal has invented a finding, and one that retries until it gets through has measured a different moment than the one it reports. The verdict for a throttled path is that it was not measured.
Terms this definition uses
Delivery and rendering
What arrives on the wire, and what only exists after something else runs.
payload ratio · render dependence · render dependence gap · edge cache pinning · TTFB · Core Web Vitals · CrUX · field data · prompt injection · Hydration mismatch · Dynamic rendering · DOM depth · Edge transformation · 202 interstitial · bot management platform
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