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Measure time to first byte from 3 Vercel regions in parallel. Two-probe warm-then-measure for accurate cold-start detection — no under-reported TLS resumption.
Two-probe warm-then-measure across 3 Vercel regions with fresh-connection TLS to avoid cached-session under-reporting. Each region times out at 8s; failed regions are shown, never silently dropped. How we measure TTFB →