redBus (2023): INP improved ~72% on search page → +7% sales (6-7.2% CR uplift across operating countries)

Claim: redBus (India) optimized the date-change interaction on the search page, improving INP by ~72%. Outcome: +7% sales, with 6-7.2% CR uplift in operating countries.

Source: web.dev/case-studies/redbus-inp (2023).

Methodology: RUM before/after on the key flow; not a true A/B but performance was the isolated change.

Confidence: Mostly yes — high attribution because the affected flow and code change are documented.

Why this matters for Candid: redBus is the cleanest published INP-specific lift number. Use when arguing for INP investment specifically, not generic "speed."