Front-End’s Missing Metric: The TBT Window
The TBT Window is the FCP-to-TTI interval used to calculate Total Blocking Time. If FCP or TTI moves, TBT can change even when long tasks do not.
Latest / June 1, 2026
Posts from June 1, 2026
2 posts from engineering leaders published June 1, 2026, by Harry Roberts and David Heinemeier Hansson.
Let the agents democratize open source
The open source movement spent decades fighting for everyone's right to change software, through free access to code and permissive licenses to release improvements. But at the dawn of the AI revolution, as this mission is finally being broadly fulfilled, it's clear that…