core(driver): wait for critical network requests #11738
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patrickhulce
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connorjclark
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connorjclark
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connorjclark
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Dec 7, 2020
lighthouse-cli/test/smokehouse/test-definitions/tricky-metrics/expectations.js
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connorjclark
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| * Returns a promise that resolves when the network has been idle (after DCL) for | ||
| * `networkQuietThresholdMs` ms and a method to cancel internal network listeners/timeout. | ||
| * @param {LH.Gatherer.FRProtocolSession} session | ||
| * @param {NetworkRecorder} networkMonitor |
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(nit unrelated to PR) any reason this isn't called networkRecorder?
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just an artifact of how it used to be in driver, though honestly networkMonitor does better express it's usage almost everywhere other than for devtoolsLog creation :)
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it always confused me b/c there is no network-monitor file. would be nice to rename one or the other
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| return {promise, cancel: mockCancelFn}; | ||
| }); | ||
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| return Object.assign(mockFn, {waitForCalls: calls}); |
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if these eyes are for preferring {... that won't work for prototype/class properties of the jest mock fn :)
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ah ya I know. I was just eying the rare case where my blanket "use spread!" doesn't work :)
connorjclark
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Summary
Waits for all critical (high priority) network requests to finish before continuing to the CPU idle check. This solves the issue when the entire page is gated on a single XHR but we move on because we're already at network 2-quiet. This also addresses the problem where the LCP image is very large and added via script where we optimistically report the LCP too early.
The net effect here will be Lighthouse taking a little longer for each run and performance scores dipping as more resources and more CPU work is included in our observations. The net effect on popular sites I tried that don't face the failure case was relatively small. The smoketest and URLs in the linked issues illustrate the massive failure cases we're addressing.
Related Issues/PRs
fixes #11180
fixes #10810
fixes #11639