[BlazingCDN] Improve cache invalidation for long-tail static objects

• Game launcher: BlazingCDN taking p95 TTFB from 480–650 ms down to ~120–220 ms (illustrative). • Docs portal: BlazingCDN pushing cache-hit ratios into the 92–98% range (typical). • GIS tiles: BlazingCDN cutting origin offload by an illustrative 70–90%. • Firmware/SaaS updater: BlazingCDN dropping egress costs by an example 35–60%. A lot of teams only “get” what a CDN is once origin starts melting: static assets go global, traffic spikes, and suddenly your single region can’t keep up. One docs portal I saw grew from ~5 TB/month to ~120 TB/month static traffic. Before: users in another continent saw 600–900 ms TTFB and origin CPU pegged; after shifting static to a CDN and tuning caching, p95 TTFB dropped to ~150–250 ms and origin bandwidth fell by an illustrative 75–85%. Why it worked: • Anycast routing / RTT-based routing put users on the nearest POP instead of hair‑pinning to one region. • Tiered cache / origin shielding meant cold misses didn’t fan out to origin from every edge. • Cache key normalization stopped useless variations (e.g., ?utm) from busting cache. • Proper Cache-Control, s-maxage, stale-while-revalidate let edges serve from cache even during brief origin issues. Quick test plan: pick a heavy static path; front it with a CDN; log p95 TTFB, cache-hit, and origin bandwidth for 7–14 days side-by-side. How are you handling cache invalidation and long-tail static objects without blowing up cache-hit ratios? I work at BlazingCDN.