Every app adds code.
Reviews, chat, upsells and pop-ups often load their scripts on every page, even where they do nothing.
What we doWe load app code only where it’s used, and list the apps that cost the most speed. You decide which stay.
Speed optimization
Shopify Speed Optimization
Why is your Shopify store slow? We find what slows it down and fix it in your theme.Fixed scope and price, 1–2 weeks. Every change is tested before and after, nothing goes live without your approval, and you get 30 days of support after launch.
No audit needed. You get a short video of what we see and a written quote before you pay.
Speed check · before
PhoneAll five Google PageSpeed checks
- Performance: 33 out of 100
- Accessibility: 87 out of 100
- Best Practices: 73 out of 100
- SEO: 92 out of 100
- Agentic Browsing: 3 of 4 checks passed
- PerformanceImages, app code, leftover code, scripts, fonts, tags, the page holding still.
- AccessibilityAlt text, labels, button names, contrast, heading order, keyboard focus.
- Best PracticesBrowser errors, outdated code, images at the wrong size, insecure files.
- SEOTitles, descriptions, link text, image alt text, robots rules, canonical tags.
- Agentic BrowsingA page structure AI agents can read, clear names, a page that holds still.
01Why it’s slow
Why your Shopify store is slow, in plain words.
Shopify’s own servers are fast. What slows a store down is usually what was added on top: apps, images, theme code and tags. Here is what we look for, and what we do about it.
Uninstalled, still loading.
Removing an app often leaves its code in the theme, still slowing every page.
What we doWe find the leftovers and take them out of the theme.
Desktop images on phones.
Large images, sliders and videos at the top of the page, sent at full size to phones.
What we doRight sizes for phones, and the first screen loads first. The rest waits until it’s needed.
Waiting, then jumping.
Scripts, fonts and tracking tags that load before the page can be used, and parts that move while it loads.
What we doScripts wait until the page works, text shows while fonts load, and the page holds still.
02PageSpeed checks
All five Google PageSpeed checks, not only speed.
PageSpeed Insights grades a page in five areas. Most speed services work on the first one. We fix what the test flags in all five, in your theme.
1Performance
What it checksHow fast the page loads and responds on a test phone, and whether it jumps while loading.
Why it mattersA slow page makes shoppers wait, and a page that jumps makes them tap the wrong thing, most of all on phones.
2Accessibility
What it checksWhether people using a screen reader, a keyboard or zoom can use the store: labels, alt text, contrast, headings.
Why it mattersEvery shopper can find a product and reach the cart. An automated test finds only part of the problems, so we don’t call a store “ADA compliant”.
3Best Practices
What it checksCode health: errors in the browser console, outdated code, images shown at the wrong size.
Why it mattersCode errors can break a button, a slider or an app on some phones and browsers. When one comes from Shopify or an app, we tell you which.
4SEO
What it checksThe basics search engines need: page titles, descriptions, links they can follow, image alt text, robots rules.
Why it mattersSearch engines can read your pages and show them the way you meant. For a full SEO review, see the audit.
5Agentic BrowsingAI agents
What it checksNew in 2026: whether AI agents can read and use the page, from a well-formed accessibility tree to a page that holds still.
Why it mattersAI tools are starting to browse and shop for people. Google marks this check as experimental.
03What we promise
No promised score. Numbers before and after every change.
Google shows two kinds of numbers. The PageSpeed score comes from one simulated visit on a test phone, and it moves between runs. The real-visitor numbers come from people using your store over the last 28 days. We use the score to find what to fix, and judge the work by both.
What we promise
- Each change tested before and after, with the same tool
- Phones first, then desktop
- When real-visitor numbers will show the change (about four weeks)
What we don’t promise
- A PageSpeed score, in any of the five checks
- A load time in seconds
- More sales or a higher conversion rate
- That speed holds after new apps are added
04How it works
A copy of your theme, your approval, then live.
- 1
A first look
Tell us about your store. You get a short video of what we see and a written quote with the price and a date. The date moves if access or approvals come late.
- 2
Before numbers
The work starts with a full speed check of your main pages on phone and desktop. We record the numbers and write the list of changes.
- 3
Work on a copy
We duplicate your live theme and work only on the copy. Apps are removed only with your OK.
- 4
You approve, then live
You preview the faster copy on your own store. We publish it, and the previous theme stays saved, one click away.
- 5
Report and support
Before and after numbers for every change, and 30 days of support: we stay on hand for your questions, and any adjustment to the work we did is included.
05Price
One fixed price, set before the work starts.
The price is in your written quote. No hourly billing.
No audit needed
Speed optimization
The speed fixes your store needs, made in your theme and tested before and after.
from $1,900USD, fixed in your quote
The price depends on your store: the theme and its design, how many apps are installed, the content on each page, outside scripts and tracking tags, a page builder, how many pages need work and which checks need fixing. The results depend on the same things.
What you get
- All five Google PageSpeed checks, not only speed
- A written list of changes from the speed check, before anything is edited
- Done in 1–2 weeks, on a date set in your quote
- Work on a copy, live only after your approval
- Numbers before and after every change, on phone and desktop
- 30 days of support after launch
- Paid before the work starts, one fixed price
Full refund if you cancel before the start date.
Full terms →20% offHad a CartWhy audit? Order fixes within 30 days of receiving the report and get 20% off the optimization. Any audit, any optimization.
More than speed?
Full store optimization covers conversion, speed, SEO and AI search, from $3,900.
You work with Vojislav, the founder of CartWhy: 10 years on Shopify and 500+ stores.
Read his story →06Limits
What’s not included, and when speed fixes aren’t the answer.
If one of these fits your store, we say so before you pay.
Quoted separately
- A redesign or a new theme
- Rebuilding an app’s feature in custom code
- New photos or video
- Paid apps and their subscriptions
- A full accessibility (ADA or WCAG) review
- Conversion fixes, or SEO and AI search beyond the PageSpeed checks
When speed fixes aren’t the answer
- The slow part is Shopify’s checkout, which no theme change reaches
- A theme too old or too edited to fix well
- A store that hasn’t launched yet
07In clients’ words
What clients say about my work.
He showed strong technical expertise and worked in a structured, professional manner, focusing on real performance issues rather than superficial score improvements.
Store owner, Turkey
He’s fast, extremely knowledgeable, and genuinely understands how to squeeze the best performance out of a website without compromising design.
Store owner, United States
He was extremely thorough and professional in his work. He did exactly what he said he would.
Store owner, United States
08Questions
Before you ask.
Do I need an audit first?
No. Speed fixes can start on their own: you get a short video of what we see and a written quote. If you want the whole store checked, conversion, SEO and AI search too, start with the full store audit.
Will you guarantee a PageSpeed score?
No. The score comes from one simulated visit and moves between runs, so a promise about it says little. We test every change before and after with the same tool and show you the numbers.
Why does my score change every time I test?
Each test is one simulated visit, and network and server timing differ a little on every run. Compare several runs, and look at the real-visitor numbers next to the score.
When will the real-visitor numbers change?
Google’s real-visitor numbers cover the last 28 days, so a change shows fully about four weeks after launch. Stores with few visitors may have no real-visitor numbers at all.
Will you make my store ADA compliant?
Nobody can promise that from an automated test, and we don’t. We fix what the PageSpeed accessibility check flags in your theme. A full accessibility review is a separate job, quoted on its own.
What is Agentic Browsing?
A PageSpeed check Google added in 2026. It looks at whether AI agents can read and use a page: a well-formed accessibility tree and a page that holds still while it loads. Google marks it as experimental, so treat it as a direction, not a grade.
Will my store look different?
No. Speed fixes change how pages load, not how they look. If a fix would change anything you can see, we show it to you first.
Do I have to remove apps?
Only if you want to. We list the apps that cost the most speed and what each one does for you, and you decide which go.
Can you speed up checkout?
Shopify runs the checkout, and no theme change reaches it. We work on the pages before it: home, collections, product pages and the cart.
Will it stay fast when I add apps?
New apps add their own code, so speed can drop again. Changes made after launch are not part of the 30 days of support. For steady care every month, there is maintenance.
What happens to my live store during the work?
Nothing, until you approve. We work on an unpublished copy of your theme, and your previous theme stays saved after launch. Products, orders, pages and prices work as usual. Please pause theme changes until we finish. If one can’t wait, make it on both themes, or ask us and we’ll quote it.
Do you need access to my store?
Yes, a collaborator account. You can remove it at any time, and we ask you to remove it after the 30 days of support.
How do I pay, and what if I change my mind?
One fixed price, paid before the work starts. If you cancel before the start date, you get a full refund. Once the work has started, the fee is not refunded.
Fix the why.
Tell us what feels slow. You’ll get a reply within 1 business day, then a short video of what we see and a written quote.
Want the whole store checked? Start with the full store audit →