Report analyzer · browser-local
Core Web Vitals 检查器
根据报告评估测量的 LCP、INP 和 CLS。此 browser-local 工具不会获取或测量网站。
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三个指标， 三个不同的问题
Core Web Vitals 测试检查负载、响应能力和视觉稳定性。比较第 75 个百分位数的字段值以获得一致的设备组。该分析器对您提供的数据应用阈值；它不验证报告的真实性或新鲜度。
将原始报告与导出的评估放在一起。实验室运行可以帮助立即调查变化，而现场数据则反映收集期间的访问者。好的结果和性能分数都不能保证搜索排名。
加载中
LCP：当最大可见内容出现时。
反应能力
INP：观察到的相互作用的延迟。
稳定性
CLS：页面布局发生意外变化。
Provenance
将设备、范围和收集日期放在一起。
Read thresholds without losing context
LCP describes loading, INP describes interaction responsiveness, and CLS describes visual stability. Lower values are better. CLS is unitless.
| Metric | Good | Needs improvement | Poor |
|---|---|---|---|
| LCP | ≤ 2,500 ms | > 2,500–4,000 ms | > 4,000 ms |
| INP | ≤ 200 ms | > 200–500 ms | > 500 ms |
| CLS | ≤ 0.1 | > 0.1–0.25 | > 0.25 |
Threshold source: Google Web Vitals guidance.
01 · Keep field and lab separate
PageSpeed Insights presents real-user field information and a separate simulated lab run. CrUX field reports aggregate observations over a 28-day collection window. A fresh lab result does not replace that history. Record the dates and device before comparing two assessments.
02 · Check the scope
A URL report concerns one page. An origin report aggregates pages under the same origin. This importer presents each separately and never fills missing URL metrics with origin values. PSI field JSON may omit device and collection dates; check the original report when they are unavailable here.
03 · Turn a finding into an investigation
For slow loading, inspect the LCP element and its resource waterfall. For delayed interactions, profile the work triggered by an actual interaction. For layout shifts, identify the moving elements and missing reserved space. The values alone cannot identify a root cause.
Understand the source: About PageSpeed Insights · CrUX record formats and scope.