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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:

      • 220920_BiDcNP_CCX
    • 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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    Core Web Vitals

    This page details results from metrics that Google has deemed Core Web Vitals . For more information about these metrics and their significance, check out our Core Web Vitals Guide.

    Observed Web Vitals Metrics (Collected in this WPT test run)

    Largest Contentful Paint

    6.55S

    Cumulative Layout Shift

    0.019

    Total Blocking Time

    2.65S

    Real-World Usage Metrics

    Compare this WebPageTest run with browser-collected performance data for this site.

    (Collected anonymously by Chrome browser | Full Report)

    Largest Contentful Paint (LCP)

    5.63S (poor)

    At 75th percentile of visits.

    • 33%
    • 25%
    • 42%

    .93S better than this WPT test run's first view (6.55S). Why?

    Cumulative Layout Shift (CLS)

    0.91 (poor)

    At 75th percentile of visits.

    • 15%
    • 1%
    • 84%

    0.891 worse than this WPT test run's first view (0.019). Why?

    First Input Delay (FID)

    .02S (good)

    At 75th percentile of visits.

    • 91%
    • 6%
    • 4%

    Field metric only, no WPT test run data.

    Note: Why can real browser usage metrics vary from test run metrics?

    Variance between your test run and real world usage is expected because a WebPageTest run uses a specific connection speed, and real world data spans all connection speeds. To closely match the p75 user in WebPageTest, try rerunning your test using a different connection speed.

    Largest Contentful Paint (6553ms)

    View as Filmstrip - View Video - About Largest Contentful Paint (LCP)

    4500ms
    6600ms
    7400ms

    LCP Event Summary

    See full details

    Time6553ms
    Size64940px²
    Typeimage
    Element TypeIMG
    Srchttps://cdn.cnn.com/cnnnext/dam/assets/170515101540-01-john-cornyn-file-large-169.jpg
    Outer HTML<img class="media__image media__image--responsive" alt="Senator John Cornyn(C) (R-TX) speaks to the media as Senate Majority Leader Mitch McConnell(R) ,R-KY, and John Thune(2nd-L), R-SD, and John Barrasso ,R-PA, look on after a policy luncheon on Capitol Hill in Washington, DC on September 27, 2016. / AFP / YURI GRIPAS (Photo credit should read YURI GRIPAS/AFP/Getty Images)" data-src-mini="//cdn.cnn.com/cnnnext/dam/assets/170515101540-01-john-cornyn-file-small-169.jpg" data-src-xsmall="//cdn.cnn.com/cnnnext/dam/assets/170515101540-01-john-cornyn-file-medium-plus-169.jpg" data-src-small="//cdn.cnn.com/cnnnext/dam/assets/170515101540-01-john-cornyn-file-large-169.jpg" data-src-medium="//cdn.cnn.com/cnnnext/dam/assets/170515101540-01-john-cornyn-file-exlarge-169.jpg" data-src-large="//cdn.cnn.com/cnnnext/dam/assets/170515101540-01-john-cornyn-file-super-169.jpg" data-src-full16x9="//cdn.cnn.com/cnnnext/dam/assets/170515101540-01-john-cornyn-file-full-169.jpg" data-src-mini1x1="//cdn.cnn.com/cnnnext/dam/assets/170515101540-01-john-cornyn-file-small-11.jpg" data-demand-load="loaded" data-eq-pts="mini: 0, xsmall: 221, small: 308, medium: 461, large: 781" src="//cdn.cnn.com/cnnnext/dam/assets/170515101540-01-john-cornyn-file-large-169.jpg" data-eq-state="mini xsmall small" data-src="//cdn.cnn.com/cnnnext/dam/assets/170515101540-01-john-cornyn-file-large-169.jpg" pinger-seen="true">...

    LCP: 6553 ms

    Start Render
    First Contentful Paint
    Largest Contentful Paint
    Layout Shift
    DOM Interactive
    DOM Content Loaded
    On Load
    Document Complete
    Render Blocking Resource Insecure Request 3xx response4xx+ response
     Doesn't Belong to Main Doc 
    Step_1 1: https://experiments.webpagetest.org/politics 2: https://experiments.webpagetest.org/.a/bundles/header.dd8c4e05ddf038b0337a.bundle.js 3: https://experiments.webpagetest.org/.a/2.301.8/js/cnn-header-second-react.min.js 4: https://experiments.webpagetest.org/optimizelyjs/131788053.js 5: https://experiments.webpagetest.org/.a/2.301.8/js/cnn-footer-lib-react.min.js 6: https://c.amazon-adsystem.com/aax2/apstag.js 7: https://cdn.cookielaw.org/scripttemplates/otSDKStub.js 8: https://www.i.cdn.cnn.com/.a/fonts/cnn/3.9.0/cnnsans-regular.woff2 9: https://www.googletagservices.com/tag/js/gpt.js 10: https://www.i.cdn.cnn.com/.a/fonts/cnn/3.9.0/cnnsans-lightit.woff2 11: https://www.i.cdn.cnn.com/.a/fonts/cnn/3.9.0/cnnsans-italic.woff2 12: https://www.i.cdn.cnn.com/.a/fonts/icons/2.4.10/cnn-icons.woff2 13: https://www.i.cdn.cnn.com/.a/fonts/cnn/3.9.0/cnnsans-condensed.woff2 14: https://www.i.cdn.cnn.com/.a/fonts/cnn/3.9.0/cnnsans-condensedmedium.woff2 15: https://amplify.outbrain.com/cp/obtp.js 16: https://cdn.cnn.com/ads/cnn/cnn_politics_landing.json 17: https://lightning.cnn.com/launch/7be62238e4c3/97fa00444124/launch-2878c87af5e3.min.js 18: https://adservice.google.com/adsid/integrator.js?domain=us.cnn.com 19: https://assets.bounceexchange.com/tag/css/creatives-base-styles.96663738.min.css 20: https://cdn.cnn.com/cnnnext/dam/assets/170515101540-01-john-cornyn-file-large-169.jpg 21: https://cdn.cnn.com/cnnnext/dam/assets/220911212435-mar-a-lago-0815-file-large-tease.jpg 22: https://cdn.cnn.com/cnnnext/dam/assets/220919113824-lofgren-cheney-split-large-tease.jpg 23: https://ib.adnxs.com/getuid?https://umto.cnn.com/user-sync?zwmc=$UID&domain=cnn.com 24: https://umto.cnn.com/user-sync?goiz=61b1079fb145486eb12a43a13fa3bb6b&domain=cnn.com 25: https://t.co/i/adsct?bci=3&eci=2&event_id=6fec5102-645f-4a38-beec-b9cb3246ef35&events=%5B%5B%22pageview%22%2C%7B%7D%5D%5D&integration=advertiser&p_id=Twitter&p_user_id=0&pl_id=e570a2cc-07e6-4e02-ad0d-3f7aafdabe4b&tw_document_href=https%3A%2F%2Fus.cnn.com%2Fpolitics&tw_iframe_status=0&tw_order_quantity=0&tw_sale_amount=0&txn_id=nyutn&type=javascript&version=2.3.27 26: https://umto.cnn.com/user-sync?ifyr=L8ABQ4VN-N-HTVY&domain=cnn.com 27: https://bea4.v.fwmrm.net/ad/u?mode=echo&cr=https://umto.cnn.com/user-sync%3Fbea4%3D%23%7Buser.id%7D%26domain%3Dcnn.com 28: https://eq97f.publishers.tremorhub.com/pubsync/verify?redir=https://umto.cnn.com/user-sync?goiz=%5Btvid%5D%26domain=cnn.com 29: https://cdn.cookielaw.org/logos/static/poweredBy_ot_logo.svg 30: https://analytics.twitter.com/i/adsct?bci=3&eci=2&event_id=6fec5102-645f-4a38-beec-b9cb3246ef35&events=%5B%5B%22pageview%22%2C%7B%7D%5D%5D&integration=advertiser&p_id=Twitter&p_user_id=0&pl_id=e570a2cc-07e6-4e02-ad0d-3f7aafdabe4b&tw_document_href=https%3A%2F%2Fus.cnn.com%2Fpolitics&tw_iframe_status=0&tw_order_quantity=0&tw_sale_amount=0&txn_id=nyutn&type=javascript&version=2.3.27 31: https://ad-delivery.net/px.gif?ch=2 32: https://ad-delivery.net/px.gif?ch=1&e=0.5035278575892745 33: https://ad.doubleclick.net/favicon.ico?ad=300x250&ad_box_=1&adnet=1&showad=1&size=250x250 34: https://umto.cnn.com/user-sync?ifyr=L8ABQ4VN-N-HTVY&domain=cnn.com 35: https://static.yieldmo.com/partner.min.html?partners=n%2Cyh%2Cb%2Clm%2Ceb%2Ca9%2Cl%2Ce%2Cg%2Ci%2Cdv360%2Ceps%2Ct%2Cs%2Cc%2Cpub%2Ca%2Cr%2Caa%2Cid5%2Ch%2Cd%2Cf&gdpr=0 36: https://ssp.behave.com/sync?tp_id=2&tp_uid=ad2d2d32-7e75-4ba1-9950-b59ab4f91574 37: https://a125375509.cdn.optimizely.com/client_storage/a125375509.html 38: https://widgets.outbrain.com/widgetOBUserSync/obUserSync.html 39: https://assets.bounceexchange.com/assets/bounce/local_storage_frame16.min.html 40: https://c4e0a7724a4f6e973e99d3d359b0deaa.safeframe.googlesyndication.com/safeframe/1-0-38/html/container.html