Modern QA2026The Cost of Slow Software
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1.1The Cost of Slow Software

Every millisecond matters. This is not a platitude -- it is a measurable business reality. Published case studies from major technology companies demonstrate the direct relationship between performance and revenue:

  • Google found that a 500ms increase in search page load time reduced traffic by 20%.
  • Amazon calculated that every 100ms of latency cost them 1% in sales.
  • Walmart observed that for every 1 second of improvement in page load time, conversions increased by 2%.
  • The BBC found they lost an additional 10% of users for every additional second their site took to load.

These are not edge cases from uniquely traffic-sensitive businesses. They reflect a universal truth about user behavior: people leave slow applications. In a world where switching costs approach zero, performance is a competitive advantage.