Control Page

Does not contain Standard YouTube Embed

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  • First tested: 2021-04-18T23:53:34.597Z UTC
  • Last tested: 2021-06-25T08:55:58.317Z UTC
  • Times tested to date: 100
Aggregate Average Score
99 Mobile
100 Desktop

Test Page

Contains Standard YouTube Embed

Page: [Test Layout] Standard YouTube Embed  

  • First tested: 2021-05-24T15:35:36.108Z UTC
  • Last tested: 2021-06-25T09:01:37.701Z UTC
  • Times tested to date: 45
Aggregate Average Score
70 Mobile
96 Desktop

Aggregate Difference

  • Mobile: 29 points (30.7% slower)
  • Desktop: 4 points (4% slower)

Test Method

Results are cumulated and averaged over the time period between the first tested and last tested dates. I send automated daily* requests to the PSI API for both mobile and desktop strategies, add the latest result for each strategy to its corresponding existing tally, then divide the tally by the number of times the test was performed, and round it to the nearest integer.

Formula: result ≈ Σ[day results] / times tested to date where ‘≈’ means rounded to nearest integer

* Additional tests are occasionally performed between the scheduled daily runs, so the times tested to date rubric will most likely not correspond to the number of days between first tested and last tested.

Embed Code Used

As provided by YouTube in “Share” panel:

<iframe width="560" height="315" src="https://www.youtube.com/embed/aTafZRecy2k" title="YouTube video player" frameborder="0" allow="accelerometer; autoplay; clipboard-write; encrypted-media; gyroscope; picture-in-picture" allowfullscreen></iframe>

Potential Solutions

Never load YouTube embeds by default. Find mechanisms to either lazy-load your YouTube video, or load it on demand, only when the user has clicked “Play” on a placeholder.

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