SnapSiteScan verdict
Your site is slow on desktop only
When desktop scores worse than mobile, the cause is almost never device speed — it is that the desktop layout loads heavier assets, larger images or extra modules the mobile view never requests.
Ownership
Front-end development
This is a front-end and design problem. The desktop breakpoint is quietly shipping content that the mobile breakpoint hides or skips.
What happens if you do nothing?
Desktop visitors are usually the higher-intent ones — researchers, buyers and business users — so the slower experience lands on the traffic most likely to convert.
Do this first
- 1
Compare what each layout actually downloads
Run both scans and diff the request lists. The extra files in the desktop run are your entire problem, and they are usually only three or four items.
- 2
Treat background video and sliders as optional
Desktop-only hero media is the most common single cause. A poster image with the video loaded on interaction keeps the design and removes the delay.
- 3
Load desktop-only components on demand
Mega-menus, maps and comparison widgets should be requested when the breakpoint applies, not shipped to everyone.
- 4
Size images to the container, not to the screen
A wide layout does not justify an uncompressed original; it justifies a correctly sized, modern-format file.
How do you know this verdict is yours?
- Desktop score noticeably lower than mobile in the same scan.
- Large hero media, background video or sliders that only render on wide screens.
- Extra widgets, mega-menus or maps rendered at desktop breakpoints only.
- Total page weight is higher on desktop than on mobile.
Not worth your time given this verdict
- Mobile optimisation, which is already passing.
- Hosting upgrades — mobile is served by the same server and performs better.
- Micro-tuning shared code paths before the desktop-only assets are dealt with.
Deprioritising a finding is a prioritisation call, not a claim that it never matters.
When to stop
When should you stop working on this?
Stop when the desktop scan requests no heavy asset the mobile scan does not, and both scores sit in the same band.
Send this to your team
The message that ends the discussion
Desktop is slower than mobile, which means the desktop layout is loading extra assets — likely the hero media or a desktop-only widget. Frontend fix, not hosting.
Quick answer
Why does my site score worse on desktop than on mobile?
When desktop scores worse than mobile, the cause is almost never device speed — it is that the desktop layout loads heavier assets, larger images or extra modules the mobile view never requests. This is a front-end and design problem. The desktop breakpoint is quietly shipping content that the mobile breakpoint hides or skips.
- Owner
- Front-end development
- First action
- Compare what each layout actually downloads
What to do next: Run both scans and diff the request lists. The extra files in the desktop run are your entire problem, and they are usually only three or four items.
Not sure which verdict is yours?
Run a scan and SnapSiteScan will name the dominant cause, the owner and the first action for your page — using the same model as this page.
Scan your siteThe other verdicts
- Your server is the bottleneckHosting or backend
- JavaScript is your bottleneckFront-end development
- Images are your bottleneckContent or design
- CSS is blocking your renderingFront-end development
- Web fonts are delaying your pageFront-end development
- Third-party scripts dominate your pageMarketing or analytics
- Your site is already fast enoughNo one — this is finished
- There is nothing measurable left to fixNo one — this is finished
- Your site is slow on mobile onlyFront-end development