First CPU Idle FCI measures how long the page becomes minimally interactive, most of the user interface elements on the screen are interactive, and the page responds reasonably to most of the data enter by the user at a given time. First Input Delay FID measures the time from when a user first interacts with the site , clicks a link, taps a button, or uses a JavaScript-driven custom control until the browser is able to respond to that interaction. Cumulative Layout Shift CLS measures the cumulative score of all unepect layout changes that occurr between the time the page start loading and the state change in the lifecycle of the net subpage.

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The list above shows metrics that measure many different aspects of performance that are relevant to users, but it’s not all-inclusive , responsiveness and smoothness are currently not includ. In some cases, there is a high probability that new metrics Malaysia Phone Number List will be introduc in the longer term to cover missing areas. The most important thing today is regular reporting via dashboards or summary reports of changes that occur throughout the process of wsite performance optimization. Sites that optimize for spe often see a dynamic regression of these activities. This is because the performance of a wsite is like physical condition one-time effort is not enough, you ne to change your lifestyle.

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One way to solve this problem is performance budgets. A performance budget is a set of metric limits that affect site performance. The concept is similar to a financial budget you set a limit and make sure you don’t go over it. performance USB Directory budget – introduction to SO Source saddyosmaniassetsimagesperf-budget-metrics The metrics dicat to performance budgets include Load time milestones times bas on the user’s eperience when loading the page Time-to-Interactive, First Contentful Paint. Quantity-bas metrics Raw metrics JavaScript weight KBMB, number of requests.