Speed Science | Shopify Site Speed Optimization Agency
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⚡Shopify Speed Optimization

Conversion Focused Speed Optimization for Fast Growing Brands

We optimize speed where it actually impacts user experience and conversions

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Every millisecond of load speed directly impacts revenue.

Improving load speed by just 0.1 seconds results in:

+9.2%

average order value

+8.4%

conversion rates

+6.9%

pages viewed per user

-5.7%

product page bounce rates

For high performance brands, speed isn’t optional.

It’s mission critical

You spend time and money getting traffic, but if your site is slow, you’re losing sales before people even see your product. Customers today expect Amazon-level speed, even from small brands. It’s why the world’s highest performing brands are all optimized to load in under 3 seconds.

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We’re conversion nerds specializing on the one lever that gives you the fastest ROI…

Improving Load Speed

Most “site speed” services focus on technical metrics like page speed scores. Those are nice but they don’t directly move the needle where it matters most: Conversions. Conversion-focused speed optimization is not about chasing a perfect score—it’s about making your store load faster for real people, on real devices, in a way that directly increases sales, add-to-carts, and revenue.

What We Do

Mobile Load Optimization

Over 70% of Shopify traffic comes from mobile. But most themes and apps aren’t built with mobile performance in mind. A slow mobile load means bounces and lost sales, especially on 4G or low-end devices.

Our solution

We strip out bloated scripts, compress media, and re-engineer your website to load ultra smooth and fast on all mobile networks and screen resolutions. The result? Faster browsing, better engagement, and more checkouts.

Add to Cart Function

A delay or glitch when adding to cart creates friction, which destroys conversions. If your cart button feels slow, clunky, or causes a full page reload, customers lose trust and drop off before checkout.

Our Solution

We optimize your cart flow with instant, AJAX-powered cart actions, preload assets, and remove cart-slowing conflicts. The result is a snappy, seamless cart experience that keeps customers moving forward confidently.

Smooth Scroll & Animations

Even with fast page loads, nothing kills user experience like choppy scroll and laggy animations. Especially on mobile, scroll stutter makes your store feel broken, even if everything else looks great.

Our Solution

We identify and eliminate scroll-jank culprits: overactive scripts, poorly optimized animations, and unthrottled events. We make your store feel fluid, responsive, and premium.

Checkout Page Speed

By the time a customer reaches checkout, they’re ready to buy. But if that final step feels slow or unpolished, drop-off rates spike. A slow checkout erodes trust and costs you high-intent sales.

Our Solution

For Shopify Plus stores, we streamline the checkout experience by optimizing custom scripts, fonts, and assets. On all plans, we ensure a fast, frictionless path to purchase—from cart to confirmation.

Product & Collection Pages

These are revenue pages. If they lag due to product sliders, reviews apps, swatches, or mega menus shoppers leave before exploring.

Our Solution

We streamline core product pages to load fast while still delivering full ecommerce functionality, boosting page-to-page flow and conversions.

Global Load Speed

If your store sells internationally but only hosts assets in North America, overseas visitors experience painfully slow load times.

Our Solution

CDN optimization, image localization, and Shopify infrastructure tweaks to ensure fast load times for every customer, no matter where they are.

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Our Optimization Sprint is our complete Shopify speed optimization service, identifying and optimizing all bottlenecks that impact your page loads. Completed, delivered, and pushed to production in two weeks.


■ 01

No contracts

Zero commitment. Our Optimization Sprint is designed to tackle everything in one shot.

■ 02

Zero downtime

No changes are ever made on your live website. All optimization is done in a safe sandbox.

■ 03

Full transparency

You’ll receive a full report of changes made, with before & after performance reports.

■ 04

Low lift, fast delivery

Order, complete our discovery form, and we’ll handle the rest. See results in just two weeks.

Optimization Sprint

For all Shopify plans

$3,995 /once


  • Mobile Page Load Speed: Fastest load times on real-world mobile networks.
  • Add-to-Cart Speed & Smoothness: Instant, glitch-free cart actions that keep users moving.
  • Page Scroll Smoothness: Fluid, responsive browsing without lag or stutter.
  • Checkout Page Load Speed: Streamlined checkout experience for higher completion rates.
  • Third-Party App Bloat Removal: Audit + remove unused or heavy apps dragging down speed.
  • First Contentful Paint (FCP) Optimization: Faster visible load to reduce bounce and improve trust.
  • Homepage Speed Optimization: A fast, mobile-first first impression that loads in seconds.
  • Collection & Product Page Optimization: Lightweight revenue pages with full ecommerce functionality.
  • Global Load Speed Optimization: Fast load times worldwide using CDN and asset localization.
  • Core Web Vitals Tuning: Shopify-specific fixes for LCP, CLS, and TBT.
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Optimization Sprint Plus+

For Shopify Plus plans ONLY

$5,995 /once


Everything in Optimization Sprint plus:

  • Custom Checkout Optimization (checkout.liquid)
  • Shopify Functions / Server-Side Logic Customization
  • Dedicated APIs + High-Volume API Access
  • More Control over International Performance

Shopify Plus gives us deeper access under the hood, including full control over the checkout, faster API limits, and advanced server-side customization. This means we can optimize the parts of your store that are off-limits on lower plans.

For brands that need all the speed they can get, lightning-fast checkouts, and global load speed tuning, we go beyond our core customizations and fully target the infrastructure-level improvements that drive serious revenue at scale.

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📋 Frequently asked questions

What happens after I place my order?

You’ll be redirected to our onboarding screen where we’ll ask a few basic questions, introduce you to your project manager, and we’ll ask for everything we need to get started.

How long will it take?

We complete our Optimization Sprint within 14 days of your project getting started.

How long before my new site speed takes effect?

Site speed changes are immediate once pushed live. You’ll enjoy faster page loads, lower bounce rates, higher conversion rates immediately. Over the next couple of weeks, you should also see your higher ad quality scores resulting in lower ad rates.

Will my website be affected during optimization?

We do 100% of our optimization work offline in a safe sandbox. Your live website is never interrupted. We only push it live when everything is completed, tested, and approved for production.

Will you help publish the live website after it’s optimized?

Yes, Shopify makes this part really simple. We’ll leave your old version of the website as a backup, and then publish the new version live.

How long will the new faster speed last for?

If your site does not go through any major changes, your site speed should not slow down once optimized. Your speed will only be affected if you add new large elements, install new apps, or go through a redesign that replaces the optimized code and files.

What if I’m not happy with the results?

If you’re unhappy with the results for any reason, we’ll provide a full refund.

📮 Get in touch

Contact us using the form below or book a call to chat.






    Speed Science | Shopify Site Speed Optimization Agency

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