#first paint

Speed-to-first-paint across AI app builders (June 2026)

The BuilderProof speed protocol uses two stopwatches rather than one number: speed-to-first-paint (prompt to first rendered preview frame) and time-to-working-app (prompt to all acceptance checks passing with zero manual edits), across five cold runs on a fixed network profile. The June 2026 timing table was placeholder data and was withdrawn on August 21, 2026.