How much faster, exactly, is AI-paired Magento development?

Across 30+ Magento projects in 2025-2026 with measured timelines: 3-5× faster on boilerplate (setup patches, db_schema, scaffolded modules, MFTF tests, Hyvä phtml), 2× faster on integration work (payment gateways, ERP webhooks, GraphQL resolvers), and roughly same speed on novel architectural decisions where human judgement dominates. Net effect on a 4-week sprint: typically delivered in 2-2.5 weeks, with the saved time spent on extra QA, accessibility, and performance polish, not billed back to the client.