[null,null,["最終更新日 2024-08-09 UTC。"],[[["YouTube, despite its massive scale, uses the same core web performance testing principles applicable to any website."],["The video explores YouTube's approach to measuring page load speed and using instrumentation to improve performance."],["Two primary testing methodologies are discussed: Real User Monitoring (RUM) and synthetic testing with WebPagetest."]]],["YouTube's web performance testing, despite its massive user base, uses universal principles. The core of their testing involves measuring page load speed and instrumenting tests for optimization. They employ two primary methodologies: Real User Monitoring (RUM), which utilizes client-side instrumentation to gather data from actual users, and synthetic testing using WebPagetest, to simulate user experiences and assess performance in a controlled setting.\n"]]
