Cumulative Layout Shift caused by plugin

  • Hello there.
    I’ve been trying to optimize my web page for Cumulative Layout Shift for weeks now, and couldn’t figure what’s causing part of my page to move during load, until, by accident, I didn’t turn off Quantcast Choice plugin.

    I’ve used Lighthouse, and I’ve used PageSpeed by Google, GTMetrix also, to inspect and confirm this.

    With plugin switched off, Cumulative Layout Shift 0.005 PageSpeed, 0.02 GTMetrix
    With plugin switched on, CLS for mobile goes to 0.131 PS and 1.32 GTM
    This shift is visible, and it’s happening between header and main content.
    It is not noticeable with high speed internet, but when I used Google Chrome network throttling, I could visually see what is happening.

    Can you please take a look?

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