概要 パフォーマンスメトリクスのAPIを有効化する setTimeout ループで FMP取得まで待つ コード npm install -S puppeteer const puppeteer = require('puppeteer') async function getPerformanceMetrics(page) { const { metrics } = await page._client.send('Performance.getMetrics') return metrics.reduce((acc, i) => ({ ...acc, [i.name]: i.value }), {}) } async function waitForFMP(page) { let doneMet = null while (true) { const data = await getPe
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