You can have the best-built brand, the most persuasive copy, and the most beautiful design. If your site takes too long to load, none of that matters: the person never gets to see it.
That’s not opinion. It’s what Google’s Core Web Vitals measure, and it’s what decides whether a visitor becomes a customer or closes the tab before the first fold even loads.
What Core Web Vitals actually mean
Three metrics, no fluff:
- ✦LCP (Largest Contentful Paint): how long it takes for the largest element on the screen (usually an image or headline) to appear. Above 2.5s, Google already considers it poor.
- ✦TBT/INP (blocking time / responsiveness): how long the page stays "frozen" processing JavaScript before it responds to the user’s click.
- ✦CLS (Cumulative Layout Shift): how much elements "jump" around while the page loads, that wrong click because a banner loaded underneath the button.
Google uses these three metrics to decide rankings. But the real reason to care isn’t SEO. It’s real people giving up on waiting.
Why this is about conversion, not technology
One extra second of load time isn’t just "one second." It’s the difference between someone seeing your offer and someone never seeing it at all. A slow site doesn’t just lose Google ranking, it loses the sale before the visitor even forms an opinion about your brand.
Real case: what we changed on our own site
Instead of generic tips, here’s what we actually did on lucianovieira.com when the mobile PageSpeed score dropped to 73/74.
Three real problems, with the same root cause that shows up on almost every site:
- ✦A decorative 2.5MB background video loading every time, even on screens where it never appeared. Fixed by making the video load only when someone scrolls near it, and never on mobile.
- ✦Google’s font blocking the page’s first render for almost 2 seconds, because it was loading the "default" way, without asynchronous loading.
- ✦Images 5 to 7 times larger than they needed to be for the space they were displayed in.
Result: the score went from 73 to 95, between these fixes and a few more fine-tuning passes (image compression, removing a broken call in the code), without removing any feature or changing the site’s look.
The most common mistakes that slow a site down
- ✦A heavy background video or image loading every time, even when hidden.
- ✦Fonts and third-party scripts (analytics, chat, ads) loading before the main content.
- ✦Images at their original camera or design size, never resized to match how they’re actually displayed.
- ✦Tracking scripts (Tag Manager, pixels, ads) stacked up with no control over when they load.
How to know if your site is fast enough
Free tool: PageSpeed Insights, Google’s own. Paste the URL, run the test in "Mobile" mode, and check the number. Below 50 is urgent. Between 50 and 89, there’s room to improve. 90+ is the target.
Conclusion
Strategic design isn’t just about how a brand looks. It’s about what it delivers in the first second of contact. A beautiful site that takes forever to load is the same broken promise as a brand with no strategy behind it: pretty, but it doesn’t work.
If your site has never been through this kind of analysis, or if you already know it’s slow and don’t know where to start, talk to me on WhatsApp and we’ll look at it together.
Graphic designer. I write about brand, form, and craft, what holds an identity together on any surface.