Fast, Green, Responsive - Ines Akrap - performance.now() 2025

Performance work has always been about speed. But speed is only part of the story. Every byte shipped carries a carbon cost, and decisions made in design and development ripple far beyond milliseconds. This session explores how web performance and sustainability are deeply connected: why faster sites are greener sites, and how minimal, efficient design becomes a responsibility that can no longer be ignored. Insights from the W3C Sustainable Web Guidelines will be presented alongside practical principles for building with both users and the planet in mind. Emerging ideas such as carbon aware websites, which adapt in real time to the carbon intensity of the grid, will be introduced as a way forward for bridging the gap between performance culture and sustainability. The result is a vision of web performance that is not only fast, but also green and responsible, with concrete steps available today. Slides: https://docs.google.com/presentation/d/1zKPhQN5zDSMdKcS76oKU-ypFXIfuyF1-QUqqgWNScVA/edit?slide=id.g259eba5583b_0_20#slide=id.g259eba5583b_0_20 *** A session from performance.now(), the web performance conference. Each November in Amsterdam; see https://perfnow.nl for more information. Conference announcements in your inbox? https://perfnow.nl/subscribe