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High INP on mobile (> 200 ms)
Interactions take over 200 ms to update the UI, hurting perceived speed and INP.
What it means
Interactions take over 200 ms to update the UI, hurting perceived speed and INP.
Why it happens on Shopify
Heavy third-party handlers on every interaction.
How to check if you have this issue
Record mobile menu opening, variant selection and cart actions. Locate long tasks around slow interactions and compare with available field data, not just a Lighthouse score.
How to fix it: precise steps
Reduce or split identified blocking work, avoid repeated computation and defer nonessential tasks. Keep immediate visual feedback and retest the complete interaction, including cart errors.
How to confirm it is fixed
Repeat the same checks as in the verification step after deploy. SEO effects can take days to weeks depending on crawl budget.
Impact on SEO and conversion
High-impact issues often hurt perceived performance or SEO consistency; fixes gradually improve rankings and conversion.
Related issues
Sources and editorial context
Teo Comyn · Updated
Technical references consulted for this revision. Illustrative examples are not measured client results. Check the current documentation and your store before applying a change.
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