How Anthropic made claude.ai 3x faster in two weeks with Claude merging 3,000+ changes
ClaudeDevs · x · 2026-09-24
Anthropic engineers made claude.ai and the desktop app about 3x faster in a two-week sprint, coordinated entirely through a single Slack channel with Claude in every thread.
Key results (75th percentile): time to typeable page on fresh load dropped from 3.1s to 0.55s, starting a Claude Code session from 0.8s to 0.3s, and loading a Claude Cowork cloud session from 2.6s to 0.73s — an estimated tens of thousands of user-hours saved daily.
How they did it:
- Claude (via Claude Tag beta, an internal model roughly comparable to Opus 5.5) found bottlenecks, built benchmarks, shipped fixes, and watched every deploy; humans set goals, made tradeoffs, and approved every change
- Focus on four journeys covering 95% of user activity
- 3,000+ merged changes with zero customer-facing incidents or rollbacks
The post shares prompts, measurement methods, and the safety loop they built — a strong case study in running agent-driven production performance work.
Related event: Anthropic Used Claude to Make claude.ai 3x Faster in Two Weeks(4 posts)→
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