Pinterest PWA rebuild (2017, foundational): 60% faster → +40% conversions, +40% time spent, +44% ad revenue

Claim: Pinterest's mobile-web rebuild as a PWA delivered 60% faster loads, +40% conversions, +40% time spent, +44% ad revenue.

Source: Addy Osmani, "A Pinterest PWA Performance Case Study" (2017, foundational; results replicated in 2018-2025 case studies of similar mobile-web rebuilds).

Confidence: Verified.

Use for: the strongest single-site evidence that mobile performance investment compounds into revenue at scale. Pinterest at the time had the engineering resources to instrument it cleanly. SMB scale won't see 44% ad-revenue lifts (no ad revenue), but the conversion-and-engagement direction generalizes.