Support » Plugin: Jetpack - WP Security, Backup, Speed, & Growth » Jetpack slowdown the website speed and increase core web vitals score

  • Resolved prgroup



    My site speed was 94 on mobile and 98 on desktop and core web vitals were fine expect speed index as per page speed insights, i was using WP-Rocket before installing jetpack.

    I installed jetpack basically for the related post feature, which is the best as compared to the others additionally i thought it will increase my website speed as well.

    But i see my pagespeed has decreased with core we vitals issue as well.

    Can you please help me out, how can correct my web vitals issue and speed up my web.


    The page I need help with: [log in to see the link]

Viewing 6 replies - 1 through 6 (of 6 total)
  • Plugin Support MadHatter



    Jetpack does include quite a few features – Depending on the settings you’ve activated and the new elements you added to your site thanks to Jetpack, an impact on your site’s performance could be expected. For example, if you’ve added Like buttons, Related Posts, a few widgets, sharing buttons, and infinite scroll, that will indeed increase your site’s loading time.

    Currently, I see that you have 14 of the total Jetpack features active.

    As with any other plugin, when enabling settings, the decision rests in which feature is worth the performance affect it could bring to your site. In general, any features that use images or call resources from third-party services (like the sharing buttons or the Facebook and Twitter widgets) will have an effect on your site speed.

    If you feel that Jetpack features are making your site slower, but don’t know what particular feature is to blame, you can always log into your wp-admin dashboard and head to Jetpack > Settings and deactivate each module, one at a time, until you can pinpoint the performance dip on a specific module. You could then decide whether that feature is worth the impact it has on your site’s speed.

    Another test that could really help (but one that should be done in off-peak times as far as your visitors are concerned) would be to deactivate all other plugins except for Jetpack to see if it truly is the cause for the load, or if another plugin is directly conflicting with Jetpack and causing load issues itself, triggering higher load for Jetpack functions to begin with.

    Please let me know the results of this troubleshooting and we can go from there. Thanks!

    Thread Starter prgroup


    Hi There,

    firstly, thank you so much for your quick guidance and help, it helped me in getting the close results.

    however, there is one problem I’m left with, Image elements do not have explicit width and height, not sure why it’s showing the related posts images in this issue. on both Mobile and Desktop.

    would request you to take a look at the PageSpeed-Insight report for this URL and help me out, please.
    check this page for instance:

    Thank you, really appreciate your help and support!


    Plugin Contributor Stef


    Hello @prgroup,

    Thanks for the follow-up – I’m glad our latest recommendations have helped you already in some capacity.

    Could you tell me more about the image problem you reported?

    I checked your site (specifically the images on and if I check them through the browser Inspector tool I can see their width and height:

    Could you also tell me more about the following?

    not sure why it’s showing the related posts images in this issue. on both Mobile and Desktop.

    I am not sure I get what you mean here 🙂

    As for the page speed checks, I did check your site URL again and I’d recommend trying enabling again our Site Accelerator and Lazy Images feature to see if they can help you improve the performance in that sense.

    Thread Starter prgroup


    Hi @erania-pinnera,

    Thank you for your response!

    Enabling the Enable site accelerator and Enable Lazy Loading for images, decreased the performance by few points. so I think I should keep it disabled.

    The problem of the image, what I’m referring to is:

    If you look at the PageSpeed Insights report for the above URL, under the Diagnostics heading it says…..
    More information about the performance of your application. These numbers don’t directly affect the Performance score.
    Image elements do not have explicit width and height
    Set an explicit width and height on image elements to reduce layout shifts and improve CLS.
    And it refers to the images that appeared in the related post (in falling elements).

    Also from yesterday, I’m seeing this error in my edit post section, I’ve changed/touched anything after installing jetpack and enabling Related posts. Any idea about this?
    Failed to load plugin url:

    Many Thanks!

    • This reply was modified 4 months, 1 week ago by prgroup.
    Plugin Contributor Dan (a11n)


    Hi there

    I’ve opened a Github issue for the image height attribute. You can follow that here:

    Failed to load plugin url:

    This is a known issue, generally caused by a plugin conflict. I’d suggest deactivating all plugins, and then activating them one by one until you find the conflicting plugin.

    Plugin Contributor Dan (a11n)


    Hi @prgroup – in case you missed it, the height attribute will be added to related posts images in Jetpack 9.8 – Keep an eye out for that update early next month.

Viewing 6 replies - 1 through 6 (of 6 total)
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