The Tell-Tale Metric: Replatforming with Edgar Allan Poe
summary
A year long replatform to a React SPA causes a 30% drop in the key revenue signal and exposes the importance of a metric called 95 ad views per second. The team builds an internal A/B platform to get rapid feedback and uses webpack visualizer flame charts Lighthouse and WebPageTest to find fixes: switch parameterized SVG imports to explicit imports reduce initial requests from 10 to 3 defer and lazy load noncritical assets and test on real devices Performance wounds heal metrics recover company wide React adoption follows despite 70% team turnover.
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