SIREN
Start a project
Shopify development

Shopify builds and optimisation that put speed and conversion first

Theme vs headless trade-offs, app-bloat speed impact, real Lighthouse deltas.

Request a store audit

Pain points

Where you lose money

App bloat is killing conversion

Every app injects scripts and external calls that slow the storefront, conflict inside the theme, and crowd the UI. Brands add tools reactively, reviews, loyalty, upsell, support, until the store carries overlapping systems and technical debt nobody owns. The damage shows up as falling mobile conversion long before anyone blames the apps.

Shopify's gaps force app dependency

Shopify lacks a lot of basic features, so owners bolt on third-party apps for vital functions, and the moment those critical apps load, LCP and INP plunge. You're trapped between missing features and the speed cost of adding them back.

The theme is doing too much

Page builders and heavy themes stack render-blocking CSS and JavaScript. A visually rich theme that scores under 60 on mobile Lighthouse loses the paid traffic you're paying to send it.

No one owns performance

Speed gets treated as a developer nicety, not a revenue line. Without a budget for it, every marketing gain leaks back out at a slow product page and a checkout that stalls on mobile.

Benchmarks

The numbers

MetricValueSource
Average cart abandonment (all devices)70.22%Baymard Institute (avg of 50 studies) (2026)
Mobile cart abandonment80.02%Baymard Institute (2026)
Desktop cart abandonment66.41%Baymard Institute (2026)

Channel mix

What we'd run

App & speed auditfoundation

We audit every installed app for script weight and overlapping function, remove or replace what's dragging you down, and move critical logic into the theme, LCP and INP first, because every channel multiplies off the store's speed.

Theme vs headless decisionfoundation

We measure your current Core Web Vitals and checkout conversion, then go headless (Hydrogen/Next.js) only when the theme is genuinely the ceiling, not as a default upsell.

Checkout & conversionprimary

Shopify's checkout is largely fixed, so the wins are upstream: product-page speed, trust, and reducing friction before the buyer hits a checkout that seven in ten already abandon.

Paid-to-store alignmentcompounding

We make sure the paid traffic you buy lands on fast pages. Spending on ads that dump into a slow storefront is the single biggest silent leak in most stores.

Engagement

What's included

Engagements start with a paid audit of installed apps, store speed, and checkout conversion, then a fixed-scope build or a monthly retainer, no open-ended hours.

FAQ

Will removing apps break my store?

We map every app's function first, replace the critical ones with native theme code or a lighter alternative, and stage changes so nothing goes dark. Most stores run 15-25 apps and genuinely need only a handful.

Do we actually need to go headless?

Usually not until you're past the point where the theme is the real bottleneck. Headless buys speed and design freedom but adds build and maintenance cost. We decide from your measured Core Web Vitals, not a pitch.

How fast will speed fixes show up?

App and theme fixes can move conversion within days, because they change how your existing traffic converts, no waiting on an algorithm.

Who owns the store and the code?

You do, always. On final payment, all theme code, app configuration, and account access transfer to you in full.

Get started

Request a store audit