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Incapsula -script affects Google-pagespeed

  • 1.  Incapsula -script affects Google-pagespeed

    Posted 16 days ago

    As we`re working on optimisation our website for Pagespeed score, we`ve found that Incapsula-javascript slows down our pagespeed score (screenshot attached). That`s fine for Desktop-score, but negatively affect on Mobile-pagespeed.
    Sometimes Incapsula-script doesn`t load when page loads, in that case Pagespeed-score showing higher results than when Incapsula-script is being loaded.

    Below is the screenshot of Mobile-pagespeed without Incapsula-script (sometimes it doesn`t load along with page-assets)

    Here`s the Mobile-pagespeed with Incapsula-script:

    So, I assume that script negatively affect on Pagespeed-score and I wonder if we could avoid loading that script? What is its purpose? Is it necessary to make Incapsula work correctly? Could we at least turn it off for mobile pages only?


    Yevhen Marynych

  • 2.  RE: Incapsula -script affects Google-pagespeed

    Imperva Employee
    Posted 2 hours ago

    That script is part of the Client Classification process.  

    See for details on Client Classification.

    There are some changes you can make in the GUI, but the best thing to do is reach out to support with details about when you want to turn it off.  


    Jim Burtoft (Prm)
    State College PA