We ran 51 Duda sites through WebSpeed and the same pattern came back on nearly every one. It is not what the speed guides tell you to look for — Duda's stylesheets are fine. What holds the page back is everything that runs while it is still drawing.
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Stored audits — the original page against the same page served through WebSpeed, on mobile and desktop. Not a demo build: these are the sites as they ship.
Real Google Lighthouse audits, original vs. WebSpeed Fast. The ring is the mobile PageSpeed after; “faster” is the Speed-Index ratio; “lighter” and CO₂ (≈0.15 g/MB per visit, Sustainable Web Design v4) come from the measured byte reduction. SEO / conversion / bounce are projections from the measured LCP improvement, not guarantees. Scores are per-page; yours will differ.
* Core Web Vitals are a Google ranking signal; the biggest lift is leaving the “Poor” zone (score < 50), scaled here by device search share.
** Akamai / SOASTA (2017): a 100 ms delay cost 7% of conversions across ~10 billion retail visits; scaled here to the measured improvement.
*** Akamai / SOASTA (2017): a two-second delay raised bounce rate by 103%; scaled to the measured improvement, site-specific.
Measured, not assumed — this is what our filter logs recorded across the Duda sites we have audited, ranked by how many of them had something to fix.
Measured across 51 Duda audits · snapshot 2026-07-28
94%of sites
Inline scripts sitting in the body execute as the browser works through the markup, so rendering stops each time one runs. On a phone that is the difference between a page that paints and one that stalls half-drawn.
96%of sites
The image the visitor is actually waiting for is fetched at the same priority as everything else on the page, so it queues behind assets that are nowhere near the viewport yet.
636fixes on 49 sites
Our highest-volume correction on this platform: preconnect and prefetch hints for origins the page doesn't end up needing. Each one spends connection budget that the resources on the critical path could have had.
454fixes on 42 sites
Duda sites lean on CSS background images, and those load whether or not anyone scrolls to them. Images also arrive without declared dimensions, so text jumps as each one lands.
Each one is independent and can be switched off for your domain — nothing here is all-or-nothing.
Inline body scripts and parser-blocking files are held until rendering is done, then run in order. Same behaviour, out of the way of the first paint.
The hero image — or the CSS background standing in for one — is preloaded at high priority, so the content that defines the page arrives first.
Resource hints that point at origins the page never uses are dropped, and the ones that matter are added.
Background images and images below the fold load as they approach the viewport instead of competing with the first screen.
Every image gets its true aspect ratio in the markup, so the browser reserves the right box before the file arrives.
Core Web Vitals have been a confirmed Google ranking signal since 2021. The biggest win is leaving the "Poor" band, where faster competitors get preferred.
— Google Search CentralConversion tracks load time closely — on Akamai’s retail numbers a delay of just 100 ms cost 7% of conversions. Shaving seconds is the cheapest funnel work available.
— Akamai / SOASTA, 2017Close a two-second gap and bounce rate roughly halves — Akamai measured those same two seconds raising it by 103%. A page that paints early keeps the visit a slow one loses outright.
— Akamai / SOASTA, 2017Transfer weight maps to emissions at roughly 0.15 g of CO₂ per MB. Cutting bytes is the one optimization that shows up on a sustainability report.
— Sustainable Web Design v4Each figure links to the page that publishes it. The studies measure what delay costs; read here as what speed returns. Industry benchmarks, not a guarantee for a specific site — the per-site numbers are the audits above, and yours is a free check away.
The advice written for Duda is the advice written for every platform: compress your images, limit your fonts, cut down on widgets. Our own numbers moved the argument somewhere else entirely.
Duda’s CSS delivery is good. Stylesheets blocked the first paint on 10% of the sites we audited. The equivalent figure on WordPress is 80%. Whatever else is true, the platform is not shipping you a render-blocking head, and any guide that starts there is solving a problem your site probably doesn’t have.
What we found instead is a different bottleneck with the same effect: the page is busy while it should be drawing. Inline scripts execute mid-render, resource hints spend connection budget on origins that go unused, the hero image waits its turn behind assets nobody can see yet, and background images load whether or not anyone scrolls to them.
None of that is visible in the editor, and none of it is a mistake anyone made. It is what falls out of a template that has to work for every layout, widget and breakpoint the builder supports — plus the widgets you added.
Duda lets you inject your own code into the page. That’s genuinely useful, and it is also the wrong shape of tool for this job.
Adding code is not the operation that speeds a page up. The operations that matter here are deferring, reordering and dropping things the platform already emits — and that markup belongs to the builder. You can’t defer a script the template inlined, or remove a resource hint you didn’t write. So the advice ends where every guide about hosted builders ends: file a feature request, or rebuild the site somewhere you control.
A reverse proxy changes where the work happens instead. Your Duda site keeps serving the page it always did; WebSpeed receives that page, rewrites its critical path, and hands the result to the visitor. Nothing inside the builder changes, so there is nothing for a platform update to undo and nothing for your team to relearn.
Of the 49 Duda sites we had measured by 28 July 2026, 48 produced a before/after we could verify. On those, the median gain was +4.5 points on mobile and +5.5 on desktop — the phone, which is the harder of the two, improves slightly less.
We count a site as a gain only when mobile goes up and desktop doesn’t fall. By that rule 65% of the 48 came out ahead. The other side of the same number: on 25% the mobile score went down. We publish it because an average is not a forecast — and because a page that gains on desktop while losing on mobile isn’t a win worth selling, whatever the average says.
It takes about a minute and needs nothing but the URL:
The range above is what we saw across other people’s Duda sites, not a promise about yours. That is the reason the check is free.
No — that is the point. WebSpeed runs in front of your existing site. You keep the builder, the editor, the hosting and your workflow; only what the browser receives changes.
Yes. We never modify the site inside the platform. Your team keeps editing in Duda exactly as before, and every publish flows through unchanged.
Yes, and that is the common case for Duda. Because there is nothing to install per site, adding a client is a DNS-level change rather than a project. Run a free audit on a couple of client sites first — in our batch of 48 verified measurements, two in three came out ahead on mobile without losing desktop, so seeing your own range matters more than any average.
Our measurements agree with them on the part they control: stylesheets blocked the first paint on only 10% of the sites we audited, where on WordPress it is one of the two most common. What is left is everything layered on top — scripts running during render, eager backgrounds, an unprioritised first screen. That is where the gains in the audits below come from.
You point your domain at WebSpeed and carry on working in Duda. Nothing is installed and nothing inside the site is configured — the page Duda publishes is the page we receive, and what changes is the order and priority in which the browser gets it. The four bottlenecks above are what our filter logs recorded most often across the 51 Duda sites we audited; the free check tells you which of them your own page actually has.
No. The usual route is the proxy: traffic is routed through WebSpeed with a DNS change and nothing is installed anywhere. If you would rather not route traffic through us, there is an on-site integration we set up together with your developer instead. Same optimizations either way.
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