The METR Study: AI Tools Made Experienced Developers 19% Slower
A rigorous RCT found AI coding tools slowed down experienced developers by 19%. The developers themselves believed they were 20% faster. The perception-reality gap changes everything.
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A rigorous RCT found AI coding tools slowed down experienced developers by 19%. The developers themselves believed they were 20% faster. The perception-reality gap changes everything.
Karpathy coined both terms a year apart. One builds $400M startups. The other lost Amazon 6.3 million orders. The difference is about to define which developers thrive.
uv is 10-100x faster than pip and replaces 7 tools. ruff replaces 10 linting/formatting tools. Migration takes 5 minutes. Here's how.
uv, ruff, Polars, Pydantic v2, orjson — all Rust under the hood. 13 Python tools rewritten in Rust, all 10-100x faster. The 95/5 pattern explained.
Bruno stores API collections as .bru files in Git. No cloud, no account, no subscription. After Postman killed free teams, I switched.
Playwright: 45% adoption, 78K GitHub stars, 2-3x faster than Selenium. Auto-wait killed flaky tests. Migration guide from Cypress and Selenium.
SQLMesh is 9x faster than dbt, with free dev environments. Fivetran-dbt merger raises lock-in concerns. Coalesce offers visual SQL. Decision framework.