How to assess loading performance in the field with Navigation Timing and Resource Timing | Articles | web.dev

Published: October 8, 2021 If you've used connection throttling in the network panel in a browser's developer tools (or Lighthouse in Chrome) to assess loading performance, you know how convenient those tools are for performance tuning. You can quickly measure the impact of performance optimizations with a consistent and stable baseline connection speed. The only problem is that this is synthetic

[efcl]

Navigation TimingとResource Timingについて。 それぞれのAPIの使い方や取得できるデータの意味、クロスオリジンのリソースの`Timing-Allow-Origin`ヘッダによる対応。 またRUMのデータとして集める場合のデータの送信方法として`navigation