Caching Case Studies

Real-world Caching case studies: what happened in production, the architecture behind it, the numbers and the lessons to take to your own team.

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1. How a B2B SaaS Platform Raised CDN Cache Hit Ratio from 40% to 92% and Halved Origin Load

   A mid-size SaaS company fixed broken cache-control headers, split cacheable from dynamic traffic, and introduced edge-side cache warming to cut origin load by 52% and slash p99 latency.

   Caching · intermediate · 12 min read

2. How Request Coalescing Stopped a Cache Stampede After Redis Failover

   A Redis primary failure triggered a stampede that took the API down for 11 minutes. Request coalescing with a singleflight pattern cut thundering-herd errors to zero.

   Caching · intermediate · 12 min read

3. The Fastly June 2021 Outage: How One Customer Config Triggered a Global CDN Collapse

   A single customer's valid configuration change activated a latent bug in Fastly's VCL software, taking 85% of the network offline for 49 minutes and knocking out major internet properties worldwide.

   Caching · intermediate · 12 min read