How we made claude.ai 3x faster in two weeks

Anthropic achieved a 3x speed improvement across claude.ai and the Claude desktop app in a two-week sprint by systematically measuring and optimizing four core user journeys. Key metrics improved dramatically, including fresh page loads dropping from 3.1 to 0.55 seconds and Claude Cowork cloud sessions from 2.6 to 0.73 seconds, collectively saving tens of thousands of user-hours daily. The team used Claude itself (running an internal research model) to identify bottlenecks, build benchmarks, and ship improvements throughout the optimization process.