| 0-49 | 50-89 | 90-100 |
PageSpeed tool by CMLABS reviews the overall performance of a web page on each cellular and laptop gadgets, and affords hints on how that web page can be improved.
PageSpeed Tool by CMLABS shows each lab and discipline records approximately a web page. Lab records are beneficial for debugging overall performance issues, as it's miles gathered in a managed environment. However, it could now no longer seize real-world bottlenecks. Field records is beneficial for taking pictures true, international consumer enjoy - however has an extra restrained set of metrics.
At the report, PageSpeed Tool shows a rating which summarizes the web page’s overall performance. This rating is decided with the aid of using Lighthouse to accumulate and examine lab records approximately the web page. A rating of ninety or above is taken into consideration good. 50 to ninety is a rating that wishes development, and under 50 is taken into consideration terrible.
When the PageSpeed Tool is given a URL, it'll appear it up within the Chrome User Experience Report (CrUX) dataset. If possible, PageSpeed tool reviews the First Contentful Paint (FCP), First Input Delay (FID), Largest Contentful Paint (LCP), and Cumulative Layout Shift (CLS) metric records for the beginning and probably the unique web page URL.
PageSpeed tool additionally classifies discipline records into three buckets, describing stories deemed good, wishes development, or bad. PageSpeed units the subsequent thresholds for good / wishes development / bad, primarily based totally on our evaluation of the CrUX dataset:
| Good | Need Improvement | Bad | |
|---|---|---|---|
| FCP | [0, 1000ms] | (1000ms, 3000ms) | Over 3000ms |
| FID | [0, 100ms] | (100ms, 300ms) | Over 300ms |
| LCP | [0, 2500ms] | (2500ms, 4000ms) | Over dari 4000ms |
| CLS | [0, 0,1] | (0,1, 0,25) | Over dari 0,25 |
PageSpeed Tool offers a distribution of those metrics in order that builders can recognize the variety of FCP, FID, LCP, and CLS values for that web page or beginning. This distribution is likewise cut up into 3 categories: Good, Needs Improvement, and Poor, denoted with green, orange, and bright red bars. For example, seeing 14% inside FCP's orange bar shows that 14% of all determined FCP values fall among 1000ms and 3000ms. These records represent a combination view of all web page masses over the preceding 28-day series period.
Above the distribution bars, PageSpeed tool reviews the seventy fifth percentile for all metrics. The seventy fifth percentile is chosen in order that builders can recognize the maximum irritating consumer stories on their site. These discipline metric values are labeled as good/wishes development/bad with the aid of using making use of the equal thresholds proven above.
Core Web Vitals are a usual set of indicators essential to all net stories. The Core Web Vitals metrics are FID, LCP, and CLS, with their respective thresholds. A web page passes the Core Web Vitals evaluation if the seventy fifth percentiles of all 3 metrics are Good. Otherwise, the web page does now no longer byskip the evaluation.
The distinction among the sphere records in the PageSpeed tool as opposed to the Chrome User Experience Report on BigQuery is that PageSpeed records are up to date each day for the 28-day period. The records set on BigQuery is simplest up to date monthly.
PageSpeed tool by CMLABS makes use of Lighthouse to research the given URL, producing an overall performance rating that estimates the web page's overall performance on one-of-a-kind metrics, including: First Contentful Paint, Largest Contentful Paint, Speed Index, Cumulative Layout Shift, Time to Interactive, and Total Blocking Time.
Each metric is scored and categorized with a icon:
Lighthouse separates its audits into 3 sections:
Opportunities show hints the way to enhance the web page’s overall performance metrics. Each thought on this segment estimates how lots quicker the web page will load if the development is implemented.
Diagnostics offer extra facts approximately how a web page adheres to nice practices for net development.
Passed Audits show the audits which have been handed with the aid of using the web page.