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WebPageTest Pro Experiment

Experiment Results

Experiments Applied:

  • Find/Replace Text

    This experiment will find and replace occurrences of text in the page, with the option of using regular expressions, capturing parentheses, and flags as well

    Assets/Instructions:

    • <link[^>]*rel="preload"[^>]*>
    • on
  • Experiment More

Experiment Impact (Notable changes between experiment and control)

Start RenderFirst Contentful PaintSpeed IndexLargest Contentful PaintCumulative Layout ShiftTotal Blocking TimeVisual CompleteFully LoadedRender-Blocking Requests
5.7sFasterExperiment:4.5sControl:10.2s5.72sFasterExperiment:4.43sControl:10.15s6.05sFasterExperiment:5.27sControl:11.32s5.84sFasterExperiment:5.82sControl:11.66s0.332BetterExperiment:0.086Control:0.4180.24sFasterExperiment:3.46sControl:3.7s6.1sFasterExperiment:17.2sControl:23.3s6.17sFasterExperiment:17.46sControl:23.63s4MoreExperiment:8Control:4

Filmstrip Comparison (Experiment vs. Control)

Adjust Filmstrip Settings
Filmstrip Options
Thumbnail Size
Thumbnail Interval
Comparison Endpoint
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Download filmstrip image...

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)