Performance issue on Theme (false positive)

Hey,

I have a performance issue with Interactivity on the client Store.

The major problem is that this number keeps increasing daily (without changing the code) or modifying the Theme(Theme editor).

When I click interactivity to see reports in Says FID(First input Delay) , my understanding is that interactivity == First input delay, When I’m checking the website in Google PageSpeed first input delay in perfect on both desktop and mobile …

Can someone please explain what the problem is and how I can fix it?

https://my-day.ge - Store Address

roll back recent changes and ab-test.

Possibly related, per pagespeed.web.dev: “FID was removed as a Core Web Vital in March 2024, replaced with INP”

https://web.dev/blog/inp-cwv

If the number keeps going up and IF shopify is using that under the hood this could indicate the dashboard JUST hasn’t been updated so is measuring a metric that returns an amount that is increasing the average.

Aside: if you paid for some “performance optimization” service and speed reports by a third party web service always return good there’s always a chance you got scam code messing with the offsite reports you see that just detects when that site tries to load your website.

This could be a glitch in Shopify calculating the metrics.

At the end of the day, it’s Google, not Shopify who ranks your site and I’d rather trust what Google PageSpeed shows.

Unless it’s a result of “optimization” as Paul mentioned in his aside, which I doubt it is in your case.

Hey guys,

Thanks for your response.

Based on PageSpeed (Google), both FID and INP are good (Mobile/Desktop).

It’s all my code and it’s as clean as possible. I can say that it’s one of the fastest websites I’m working on.

I have other stores where the actual performance (from users’ perspective) is significantly slower, and Shopify gives them a 35ms interactivity score.

I agree, Tim. What matters for ranking is Google, and the “actual speed” real user experience, they are good. But this number has doubled in a week and increases every day, which is scary. What if this metric really means something? :slightly_smiling_face:

Try asking in slack https://shopifypartners.slack.com/archives/C0146D65A5C – some real people from Shopify are there.

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