Humangoodkind Designs
Crafting beautiful websites that convert customers
News, insights, and practical best practices from a studio focused on building sharper, faster, more thoughtful digital experiences.
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Most business owners think about their website in terms of design: does it look good, does it communicate the brand, does it feel right. What they don't think about—until a developer tells them—is performance. Specifically, the Core Web Vitals that Google uses to measure whether your site actually works well for real users.
Here's the thing: this isn't just an SEO issue. Site performance is a conversion issue. A slow page doesn't just rank lower—it loses customers before they've even seen your product.
Core Web Vitals are a set of metrics Google uses to evaluate the real-world user experience of a web page. There are three primary signals:
These three scores combine to tell Google—and your visitors—whether your site is fast, stable, and responsive. They also feed directly into your PageSpeed Insights score, which is a quick proxy for overall site health.
The data on this is consistent and significant. Google's own research has found that as page load time increases from one to three seconds, bounce probability increases by 32%. From one to five seconds, it jumps to 90%. And a one-second delay in mobile load times can reduce conversions by up to 20%.
That's not hypothetical. Those are customers who landed on your page, waited, and left before you had a chance to sell to them.
A one-second delay in mobile load times can reduce conversions by up to 20%. Those are real customers who landed on your page, waited, and left.
High CLS scores—where elements visually jump as the page loads—cause misclicks, friction, and immediate distrust. Slow INP scores make your site feel broken even when it technically isn't. Every one of these issues is a reason for a visitor to bail.
For eCommerce stores especially, this matters at every stage of the funnel: landing pages, product pages, cart, and checkout. A slow checkout is a lost sale—full stop.
In my work auditing and rebuilding sites, the same offenders show up repeatedly:
YouTube iframes, Instagram embeds, and third-party widgets are some of the biggest performance killers on the web. They load enormous amounts of external scripts and media the moment your page initializes—even if the visitor never scrolls to them.
I wrote about this directly in a recent post: a client's homepage had five YouTube embeds using Webflow's default component, and their desktop PageSpeed score was stuck in the 30s. Swapping those out for a lazy-loading solution (using Paul Irish's Lite YouTube Embed) pushed their score into the 80s and dropped load times significantly. If you're dealing with embedded video, read that post—it's the single highest-ROI fix I've seen.
Images served at the wrong size, in the wrong format, or without lazy loading are a silent performance tax on almost every site I audit. The fix: serve images in WebP or AVIF format, use responsive sizing, and lazy-load anything below the fold.
For quick wins on compression before uploading, two tools I reach for regularly: TinyPNG handles PNG and JPEG compression with minimal quality loss, and imagecompressor.com gives you batch compression with fine-grained quality control. Either one can cut image file sizes by 50–80% in under a minute—no Photoshop required.
Third-party scripts loaded in the <head> of your page—analytics, chat widgets, marketing tools—block the browser from rendering your content until they've finished loading. Loading them asynchronously or deferring them to the footer eliminates this bottleneck.
Custom fonts are often loaded in a way that causes invisible or unstyled text during load, contributing to both LCP and CLS scores. Preloading your critical fonts and setting explicit fallback fonts eliminates this flicker and stabilizes your layout.
For Shopify stores specifically: every app you install has the potential to inject scripts, stylesheets, and iframes into your storefront. I've audited stores running 20+ apps where half of them were abandoned tools still loading on every page. A regular app audit is part of sound store maintenance.
Start with Google PageSpeed Insights. Run your homepage, a product or service page, and any page you're actively driving traffic to. Look at both mobile and desktop scores—mobile is weighted more heavily by Google and is typically where the most ground is lost.
Google Search Console also surfaces Core Web Vitals data at scale, showing you which URLs on your site are failing, passing, or borderline. If you're not checking this regularly, you're flying blind on one of the metrics Google explicitly uses as a ranking signal.
When I run a performance optimization engagement, I follow a prioritized sequence:
The order matters. There's no point optimizing font loading if you have five unoptimized YouTube embeds pulling down your LCP score.
The client site from the YouTube embed post was a real-world example of this. A homepage in the 30s on PageSpeed wasn't failing because of bad design or poor content—it was failing because of five default YouTube iframes loading on initialization. One targeted fix produced a 50+ point improvement and measurable improvements to LCP and TBT scores.
That's not unusual. Targeted performance work frequently produces disproportionate gains because the biggest issues are often concentrated in a handful of root causes.
A site health diagnostic isn't just about SEO rankings. It's about finding the gaps between your site's potential and its current reality—and closing them in a way that translates into real business outcomes.
Every dollar you spend on ads or content is worth more when the destination performs.
Faster pages get indexed better, rank higher, load more reliably on mobile, and convert more of the traffic you're already paying to acquire.
If your site hasn't had a performance audit recently—or ever—that's worth fixing. I run Site Health & Wellness Diagnostics that cover Core Web Vitals, PageSpeed, technical SEO, and conversion-impacting issues, with a clear prioritized action plan at the end.
Get in touch and let's take a look at what's actually slowing you down.
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