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WebPageTest Pro Experiment

  • ExperimentSettings: motog4Chromev1054GVirginia USA
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    • First View only
    • Test runs: 3
    • Connectivity: 9000/9000 Kbps, 170ms Latency
    • Custom Metrics

    Experiment Info:

    • Mimic Pre-rendered HTML

      This experiment mimics server-generated HTML by swapping the initial HTML with the fully rendered HTML from this test run. Note: this will very likely break site behavior, but is potentially useful for comparing early metrics and assessing whether moving logic to the server is worth the effort.

      Assets/Instructions:

      • 220919_AiDcKA_E68
    • Disable Scripts

      This experiment makes all scripts (inline and external) unrecognizable as javascript by the browser in order to demonstrate whether the site will still be usable if JavaScript fails to properly run.

      Assets/Instructions:

    Related Links: Original (Control Run), Original Test

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    Experiment Results

    Experiments Applied:

    • Mimic Pre-rendered HTML

      This experiment mimics server-generated HTML by swapping the initial HTML with the fully rendered HTML from this test run. Note: this will very likely break site behavior, but is potentially useful for comparing early metrics and assessing whether moving logic to the server is worth the effort.

      Assets/Instructions:

      • 220919_AiDcKA_E68
    • Disable Scripts

      This experiment makes all scripts (inline and external) unrecognizable as javascript by the browser in order to demonstrate whether the site will still be usable if JavaScript fails to properly run.

      Assets/Instructions:

    • Experiment More

    Links:

    Experiment Impact (Notable changes between experiment and control)

    Start RenderFirst Contentful PaintSpeed IndexLargest Contentful PaintCumulative Layout ShiftTotal Blocking TimePage WeightBlocking Requests
    1.4sSlowerExperiment:2.4sControl:1s1.15sSlowerExperiment:2.1sControl:0.95s6.66sFasterExperiment:2.56sControl:9.22s8.67sFasterExperiment:3.39sControl:12.05s0.003BetterExperiment:0.001Control:0.0034.06sFasterExperiment:0sControl:4.06s3021KBLighterExperiment:2224KBControl:5245KB1MoreExperiment:1Control:0

    Note: This experiment had a 0.65s difference in response time between the median experiment and control runs, which can make other metric changes seem more significant than they really are. To examine the variability of response times in all test runs, you can plot full results. Or, you can view this comparison with TTFB removed from relevant metric comparisons.

    Remaining Opportunities

    Here's how your overall opportunities look after this experiment:

    Jump to Opportunities by Category:

    Is it Quick? Not bad...

    This site took little time to connect and deliver initial code. It began rendering content with little delay. There were no render-blocking requests. The largest content rendered a little late.

    • Opportunities 7
    • Tips 7
    • Pro Experiments 10

    Is it Usable? Needs Improvement.

    This site had minor layout shifts. It took little time to become interactive. It had 3 accessibility issues, 2 critical. Some HTML was generated after delivery, potentially delaying usability.

    • Opportunities 3
    • Tips 3
    • Pro Experiments 3

    Is it Resilient? Not bad...

    This site had no render-blocking 3rd party requests that could be a single point of failure. It had no security issues. Some HTML was generated after delivery, which can cause fragility.

    • Opportunities 1
    • Tips 1
    • Pro Experiments 3

    Filmstrip Comparison (Experiment vs. Control)

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

    Filmstrip key:

    • Visual change
    • Visual change + Layout Shift
    • Largest Contentful Paint
    • Largest Contentful Paint + Layout Shift
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    2: Original (Control Run)Test Run Details

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    Waterfall Opacity (Adjust the transparency of each run's waterfall)