TechStart: E-Commerce Website Development in the USA
Bytecode partnered with TechStart, a fast-growing retail brand, to design and build a scalable Shopify platform that increased sales and improved SEO visibility.
Read case studyShopify speed optimization for Core Web Vitals
Your store does not need another surface-level score report. We audit what slows real shoppers down, then fix theme code, apps, LCP images, fonts, and INP issues that hurt Core Web Vitals.
up Top Rated on Upwork
148+ projects delivered
US & Canada · 24h replies
What you get
Shopify speed optimization, done properly
Shopify speed optimization is not one toggle. A slow Shopify store is usually a mix of app scripts, heavy theme code, oversized LCP images, font loading, tracking tags, and JavaScript that blocks taps and clicks.
Bytecode reviews your store against Core Web Vitals and real-user constraints. Start with the free Shopify speed and SEO audit. If the fixes make sense, we can implement them cleanly in your theme without breaking checkout, analytics, or merchandising.
App and script audit
We review third-party apps, pixels, tag managers, and theme scripts to find what loads too early or runs too often. You get a clear keep, defer, replace, or remove plan.
Theme code cleanup
We reduce unused Liquid, CSS, and JavaScript where it affects real pages. The work is done with care so product pages, carts, tracking, and promotions keep working.
LCP image fixes
We tune hero, product, and collection images that usually drive Largest Contentful Paint. That can include sizing, preloading, lazy loading rules, and format cleanup.
Font loading improvements
We review font files, weights, display behavior, and loading order. The goal is faster rendering without changing your brand system unless you approve it.
INP and interaction fixes
We look for JavaScript that delays taps, menu opens, variant changes, filters, and add-to-cart actions. Then we reduce main-thread work where it matters.
Core Web Vitals tracking
We compare lab tools with field data where available. You get before-and-after notes so you can see what changed and what still needs attention.
How it works
From first call to launch
01
Start with audit
Send your store URL through the free audit at free audit and we will review speed, SEO basics, and visible technical risks.
02
Prioritize fixes
We separate high-impact work from cosmetic score chasing, so you know what is worth doing first.
03
Implement safely
We make changes in theme code and app configuration with a focus on preserving checkout, analytics, and merchandising workflows.
04
Measure results
We review the affected templates after deployment and explain what changed in plain language.
Why Bytecode
Why teams pick us for Shopify speed optimization
Senior developer attention
Bytecode is led by Tapabrata Goswami, founder and lead developer. He is Top Rated on Upwork, with 148+ projects delivered and 98% client satisfaction.
Deep Shopify code knowledge
Speed work often crosses Liquid, JavaScript, CSS, SEO, analytics, and app behavior. Bytecode handles Shopify, Shopify Plus, WooCommerce, React, Next.js, Node.js, Laravel, and PHP work.
New York based
Bytecode is based in New York and serves clients across the US and Canada. We reply to inquiries within 24 hours.
Case study results · 90 days
3.1×Online sales
−52%Mobile checkout abandonment
+212%Organic impressions
1.4sAverage page load
FAQ
Questions, answered
What does your Shopify speed optimization service include?
We audit apps, scripts, theme code, images, fonts, tracking tags, and key templates. Then we identify the work most likely to improve Core Web Vitals. If you want us to implement the fixes, we can handle the code and configuration changes.
Do you guarantee that my store will pass Core Web Vitals?
No. We do not guarantee scores, rankings, traffic, or revenue. Core Web Vitals depend on real-user data, devices, networks, apps, theme code, and page templates. We focus on practical fixes that improve the conditions Google measures.
Which Core Web Vitals do you work on?
As of 2026, Core Web Vitals focus on LCP, INP, and CLS. LCP relates to the main content loading. INP relates to responsiveness after user input. CLS relates to unexpected layout shifts.
Why is my Shopify store slow if my theme is modern?
A modern theme can still be slowed down by app scripts, pixels, large media, unused JavaScript, render-blocking CSS, and font loading. Product pages and collection pages often collect extra code over time. A proper audit shows what is actually affecting shoppers.
Can you work with our current Shopify apps?
Yes. We review the apps you already use and explain the speed tradeoffs. Some apps can be configured better, loaded later, or limited to certain templates. If removal is the best option, we will say that clearly.
How do we start?
Start with the free Shopify speed and SEO audit at free audit. Share your store URL and any known issues, such as slow product pages or poor mobile scores. Bytecode replies to inquiries within 24 hours.
Related reading
Guides from our blog
Shopify Speed Optimization: A Practical Checklist to Pass Core Web Vitals
An engineer's prioritized checklist for speeding up a Shopify store: apps, theme code, LCP images, fonts, INP and layout shift, plus how to measure Core Web Vitals with real field data.
Read article
Mobile Checkout Abandonment: 7 Fixes That Actually Move the Needle
Most mobile checkout advice is generic. Here are seven specific, high-leverage fixes we've used on real DTC storefronts to cut mobile cart abandonment — ranked roughly by impact per hour of engineering time.
Read article
The Shopify Technical SEO Checklist: What Actually Moves Rankings
Duplicate product URLs, filter pages, structured data, redirects and Shopify Markets hreflang: a practical technical SEO checklist that separates what Shopify controls from what your theme and apps control.
Read article
Taking on new projects
Start with a free Shopify speed audit
Send your store URL and we will review the biggest speed and Core Web Vitals issues before you commit to implementation.