Site speed is a powerful—and often overlooked—driver of revenue. A fast-loading website is much more than a nice-to-have: Loading speed directly affects site performance, user experience, and conversion rates.
Shoppers don’t wait for a slow website; they leave your site, and you leave potential revenue on the table. According to Google, 53% of site visits result in a bounce when pages take more than three seconds to load.
This article explains the factors that affect site speed and how to get the most, speed-wise, out of your ecommerce store.
What is site speed?
Site speed refers to how quickly your website and elements like images, text, and navigation load, including how fast multiple webpages become interactive for users. It supports a smoother user experience, supports ranking visibility, and keeps customers from bouncing (leaving your site) too early.
Core Web Vitals are a set of performance metrics that use real user data and performance monitoring to determine how your website behaves under actual traffic conditions. For example:
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Largest Contentful Paint (LCP). Measures when the main content, such as a hero image or headline, loads. An ideal LCP is 2.5 seconds or less.
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Cumulative Layout Shift (CLS). Measures visual stability, specifically how little a page’s content shifts or jumps as it loads. A good score is 0.1 or less.
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Interaction to Next Paint (INP). Measures responsiveness, specifically how quickly a page responds when someone clicks, taps, or types. Aim for 200 milliseconds or less.
These can be measured with a variety of tools, including Google PageSpeed Insights, Chrome DevTools, and Google Search Console.
What affects site speed?
Several factors influence web performance. These include:
Large images and media
High-resolution images and videos increase request volume, the number of files a browser must load; this slows page speed. Compressing or resizing these files is one of the easiest ways to improve webpage load times.
Bloated code
The larger your code files, the more data a server has to transfer to a browser. Unnecessary code, such as excessive JavaScript and unused CSS files (which control your site’s visual design), creates excess drag on a website, reducing site performance.
Third-party apps
Every app you add comes with scripts (small pieces of code that tell your website to perform specific functions when the page loads) that connect to external servers. Too many apps increase the number of network calls and decrease website speed.
Lillian Tung, cofounder of the body hair care brand Fur, warns ecommerce entrepreneurs not to install dozens of apps they don’t use.
“You don’t want your marketing tech stack to be enormous,” she says on an episode of the Shopify Masters podcast. “That’s going to slow down your site. You don’t want to have 50 apps plugged that you’re no longer using.”
Hosting and infrastructure
Choose a hosting provider with built-in caching (which saves files locally so returning visitors don’t have to download them again), a content delivery network (CDN) that serves from locations geographically close to your audience to reduce latency, and publishes performance guarantees.
Why site speed matters for ecommerce
Although site speed isn’t as glaring as a broken checkout button, it influences factors such as conversion rates, user experience, and search rankings, all of which are important for a successful ecommerce store. Here’s more on why site speed matters:
Improved conversion rates
When pages load quickly, customers stay engaged. Small delays increase waiting time and reduce conversions. Even a 0.1-second improvement to site speed can have positive effects on conversion, increasing retail consumer spend by nearly 10%, according to a Deloitte report. Choosing reliable infrastructure, such as built-in caching, a CDN, and high uptime (the gold standard is 99.999%, which means your site would only be down for five minutes annually).
Better user experience
A fast website feels professional and trustworthy. When visitors can navigate without friction, they view more content and complete more purchases.
Steve Bauer, vice president of ecommerce at furniture company Arhaus, saw significant engagement improvements after migrating to Shopify, which he attributes partly to increased site speed.
“When we first migrated, we saw a lot of gains in engagement metrics on our site,” he says in a Shopify case study. “We saw huge improvements in site speed and the way that images were displaying on the site. That was a huge win for us.”
Improved SEO rankings
Search engines like Google prioritize website performance. Faster sites help search engine crawlers analyze content more efficiently, improving search engine optimization (SEO) and search rankings. A slow page increases bounce rate, signaling poor quality to search engines.
How to improve site speed
- Optimize images
- Minimize code
- Enable lazy loading
- Use Shopify’s built-in performance features
- Monitor performance regularly
Improving site speed doesn’t require advanced development knowledge. Focus on these high-impact techniques:
Optimize images
Reduce image file sizes, either when downloading them from an image editor or by using a lossless compression tool, and use web-optimized formats like WebP. Smaller files mean fewer requests and help pages load quickly. There are Shopify apps that can automate this.
Shopify also optimizes images automatically through built-in file compression and a content delivery network (CDN), which serves your site from the server nearest to each visitor. This improves performance globally but won’t fully compensate for very large images or unsupported file types, so it helps to resize images and use efficient file types (such as JPEG or WebP) before uploading them.
Minimize code
Review your installed apps and assess which ones you still use and which you can remove. Every script adds latency, the waiting time before data begins loading.
Raquel Acosta of pottery company Glaze Me Pretty emphasizes keeping her tech stack lean to protect web performance.
“I’m mindful about not bloating [my site] with apps because I want it to be fast, and I know sometimes installing apps for the sake of it can slow down sites,” she says. “So I try to be lean and only install things that I think are essential and are going to improve the user experience.”
After removing the unused app, check your theme for any leftover code snippets, as some apps might leave behind leftover theme files. Remove these, so they aren’t being loaded every time.
Review resource-heavy features, such as bulky animations, unnecessary plug-ins, and other unused third-party scripts, like tracking pixels or chat widgets. This reduces what your site has to load and improves speed.
Enable lazy loading
Lazy loading delays the loading of below-the-fold images and media until a user scrolls to them, improving initial page load speed. Many Shopify themes include it by default, but you can also use an app such as SEOWILL or hire a developer to add it to your site.
Use Shopify’s built-in performance features
Shopify’s built-in features improve site performance without manual configuration. To get the most out of them, use a fast-loading theme and avoid overriding default settings. These include:
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CDN delivery for global locations
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Image compression
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Browser caching
You can also use Shopify’s Web Performance Reports to track Core Web Vitals and monitor performance metrics over time.
Monitor performance regularly
Use performance monitoring tools to test website speed. Common options include:
Run a speed test and review the report. Anything under two seconds is considered excellent (ecommerce sites should aim for less than 2.5 seconds), while anything over three seconds needs improvement. These tools also help determine which factors are slowing your website.
Site speed trade-offs
While most merchants aim to improve website speed, some intentionally trade it for branding. Graza Olive Oil cofounder Andrew Benin placed a massive 24-megabyte video on the brand’s homepage. He acknowledges it slows load time, but says he felt the visual storytelling justified the decision.
“We did a lot of no-nos when we created our site,” he says. “That video on our homepage means our load times can be slow, but we felt that this was how we were going to get the kind of visual we wanted. It’s got a CTA that maybe a lot of people won’t click on, but we figured that the people who do click on it probably have a high intention of purchase.”
This example shows that site speed should support business goals, not dictate them.
Site speed FAQ
What is a good site speed?
A good page load time is typically under three seconds. Strong core web vitals scores indicate healthy website performance.
What is the best way to improve site speed?
Start by optimizing images, reducing apps, and using Shopify’s built-in performance features. Regular performance monitoring helps identify issues.
How do I test my website speed?
Use a speed testtool like Google PageSpeed Insights. Enter your URL, run the test, and review the performance metrics. Aim for a two-second load time or less.
