CODEWITHSUNDEEP
lighthousepagespeed-insightsweb-performance
addyo
addyo

Reputation: 2928

Are the Core Web Vitals metrics configurable at build time?

Is it possible to configure the Core Web Vitals metrics thresholds during build time? or as part of your CI process?

Upvotes: 2

Views: 293

Answers (1)

addyo
addyo

Reputation: 2928

The Core Web Vitals prescribe a specific set of metrics thresholds and percentiles we believe correspond well to user expectations across a range of devices.

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We encourage using our official thresholds as much as possible. If however, you would like to set custom targets for thresholds (e.g a Largest Contentful Paint performance budget of < 3s), this is possible using Lighthouse CI and LightWallet. Metric targets can be set using assertions and a performance budgets file.

An example of such assertions can be found below:

{
  "ci": {
    "assert": {
      "assertions": {
        "largest-contentful-paint": ["warn", {"maxNumericValue": 3000}],
        "viewport": "error",
        "resource-summary:document:size": ["error", {"maxNumericValue": 14000}],
        "resource-summary:font:count": ["warn", {"maxNumericValue": 1}],
        "resource-summary:third-party:count": ["warn", {"maxNumericValue": 5}]
      }
    }
  }
}

Upvotes: 1

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