The client's website was experiencing long build times, with 35-minute build cycles that were slowing down iteration cycles. The migration to Next.js on Vercel allowed for a hybrid approach of generating most important pages at build time and not generating less frequently visited pages or localized ones. This resulted in a significant reduction in build times from 35 minutes to just five minutes. Additionally, the use of Incremental Static Regeneration (ISR) enabled fast page loading without sacrificing performance. The migration also improved developer experience with better APIs, easier testing and QA, and faster iteration cycles. The client saw an 85% reduction in build times, a 14% increase in their Real Experience Score, and a significant reduction in lines of code. Overall, the migration was a success, allowing the team to continue using headless tools without disruption and empowering them to iterate on new features with Vercel's safety net.