Why is my desktop page CLS poor and how can it be fixed?

Technical Q&A
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Topic summary

A user reports a sudden decline in Core Web Vitals’ Cumulative Layout Shift (CLS) scores for desktop pages starting March 25th, while mobile pages remain in the “Good” range.

Key concerns:

  • Identifying the root cause of poor desktop CLS
  • Potential negative impact on Google search rankings
  • Whether the issue stems from their Shopify theme (Responsive 1.2.7) and if the theme developer is addressing it

Current status:

  • Screenshots were shared but appear corrupted/unreadable in the thread
  • Another user has offered to analyze the site directly if the store URL is provided
  • No diagnosis or solution has been identified yet

The discussion remains open, awaiting further technical investigation to pinpoint layout shift causes and determine appropriate fixes.

Summarized with AI on November 20. AI used: claude-sonnet-4-5-20250929.
1

I am receiving a poor CLS for all of my Desktop pages. This seems to have started on March 25th (see attached screenshots) . Luckily the mobile pages all rank “Good” but should I be worried about the desktop version ranking poorly?

  1. how do I determine what could be causing it?

  2. Will this negatively impact my google search ranking?

  3. Is this something that shopify/theme developer is/will be working on a fix for?

The theme I am using is Responsive 7.2.1

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image 1.jpg964×796 42.1 KB

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2

@Maya9
Hii, Can You Please Share the Store URL I Will Check Your Website Score and Provide proper Solution for how to improve Your Score.