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WebPageTest Pro Experiment

Experiment Results

Experiments Applied:

  • Add HTML to end of head

    This experiment adds arbitrary HTML text to the end of the head of the tested website.

    Assets/Instructions:

    • <link rel="preload" as="image" href="https://cdn.cnn.com/cnnnext/dam/assets/221005162545-02-luhansk-ukraine-advance-large-tease.jpg">
  • Experiment More

Experiment Impact (Notable changes between experiment and control)

Start RenderFirst Contentful PaintSpeed IndexLargest Contentful PaintTotal Blocking TimeVisual CompleteFully LoadedPage Weight
1.68sFasterExperiment:8.84sControl:10.52s1.74sFasterExperiment:8.79sControl:10.53s3.45sFasterExperiment:9.56sControl:13s4.57sFasterExperiment:9.93sControl:14.49s4.76sSlowerExperiment:14.25sControl:9.48s4.48sFasterExperiment:9.94sControl:14.42s3.41sFasterExperiment:59.05sControl:62.46s74KBLighterExperiment:6228KBControl:6301KB

Note: The metric comparisons above exclude differences in response time that exist between the median experiment and control runs of this experiment. View this comparison with TTFB differences included.

Filmstrip Comparison (Experiment vs. Control)

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Filmstrip key:

  • Visual change
  • Visual change + Layout Shift
  • Largest Contentful Paint
  • Largest Contentful Paint + Layout Shift
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Waterfall Opacity (Adjust the transparency of each run's waterfall)