Score an edge delivery setup on cache efficiency, tail latency, reliability and protocol adoption, then rank the weakest.
Each pillar is normalised to 100 from a figure you can pull from CDN analytics, with cache and tail latency carrying the most weight because they dominate what users experience. Latency scores as a ratio rather than a subtraction, so a p95 at twice the target scores 50 regardless of the absolute numbers. A single score makes edge configuration comparable across properties and over time, and naming the weakest pillar turns it into one concrete action instead of a dashboard nobody acts on.
Edge Performance Score
score = cache × 0.30 + tail latency × 0.30 + reliability × 0.25 + protocol adoption × 0.15, where cache is scored against a 95% target and latency as target ÷ observed p95.
score = cache × 0.30 + tail latency × 0.30 + reliability × 0.25 + protocol adoption × 0.15, where cache is scored against a 95% target and latency as target ÷ observed p95. Each pillar is normalised to 100 from a figure you can pull from CDN analytics, with cache and tail latency carrying the most weight because they dominate what users experience. Latency scores as a ratio rather than a subtraction, so a p95 at twice the target scores 50 regardless of the absolute numbers.
A single score makes edge configuration comparable across properties and over time, and naming the weakest pillar turns it into one concrete action instead of a dashboard nobody acts on.
This calculator takes 8 inputs: Byte cache hit ratio, Observed p95 response time, p95 latency target, 5xx error rate at the edge, Measured availability, Handshakes resumed or 0-RTT, Compressible responses actually compressed, Traffic served over HTTP/3. The pre-filled defaults are a realistic starting point — replace them with figures from your own environment for a result you can act on.