Shopify Speed Optimization Services

Ask what they'll measure, and where. A good specialist starts from field data: Core Web Vitals from real visitors, as reported in Google Search Console or the real-user section of PageSpeed Insights. A proposal built around moving a lab score from 40 to 90 is a proposal to pass a test, not to speed up your store.

Expect a cost for every app and tag. The audit should list each app and third-party tag that loads on the storefront, how much script it adds, and whether anyone still uses it. It's common to find an app nobody on the team can explain, still loading on every page.

Check which templates they'll test. Paid and organic traffic usually lands on product and collection pages, and those are often heavier than the homepage. Ask for results per template, tested on a mid-range phone over mobile data, because that's the shopper who notices a slow page first.

Ask how they'll keep the apps working. Deferring a script is easy; deferring it without breaking reviews, subscriptions or tracking takes care. The specialist should work on a duplicate theme, say which changes need your sign-off, and hand over a list of every change made.

Red flags. Guaranteed scores. A "speed booster" app offered as the fix, because adding an app rarely solves an app problem. Lazy-loading everything, including the hero image, which makes the main loading metric worse. An audit that still reports First Input Delay, which INP replaced in 2024. And a recommendation to change themes before anyone has measured the current one.

Agree the handover. Speed decays as apps and campaigns get added. Ask for the baseline numbers, the templates tested and a short list of what to check after each new install, so your team can spot a regression without paying for another audit.

Shopify page speed optimization rarely starts with the theme. The weight usually comes from what's been added on top of it.

Apps that inject scripts. Reviews, upsells, popups, chat and loyalty apps each load their own JavaScript, often on every page, even where they show nothing. A handful of them can outweigh the theme's own code.

Oversized hero images and video. A 4MB banner or an autoplay background video is often the largest thing on the page, and usually the element that Largest Contentful Paint (LCP, how long the main content takes to appear) is timing. Shopify's CDN serves modern formats such as WebP automatically, but only resizes images when the theme requests sensible widths.

Fonts, sliders and forgotten tags. Three font families in four weights, loaded before any text can render. A carousel library loaded site-wide for one homepage slider. Ad pixels, heatmaps and test tools added for a campaign and never removed, all competing for the browser's main thread, which slows Interaction to Next Paint (INP, how quickly the page responds to a tap).

Judge results on field data. PageSpeed Insights shows two sets of numbers. The lab score is one simulated load on a throttled phone; it moves between runs and says nothing about your actual shoppers. Field data covers real Chrome visitors over the previous 28 days, and it's what Google's ranking systems use.

The targets are LCP of 2.5 seconds or less, INP of 200 milliseconds or less and Cumulative Layout Shift (CLS, how much the layout jumps) of 0.1 or less, at the 75th percentile of visits. A store can score 45 in the lab and still pass all three in the field. Judge the project on field data a month after the changes ship, not on the score the day they go live.

Speed work splits into three kinds of engagement. Typical ranges:

Most engagements start with the audit and pick from the rest based on what it finds: