Srovname.cz: 25% More Mobile Conversions from Speed Improvements

Srovname.cz is a Czech price comparison site helping users find the best deals across e-shops.

In 2016, we sped up Srovname.cz's mobile site, increasing mobile conversion rates by a quarter. These aren't just numbers in reports but real money in the bank.

Website speed directly affects company revenue. It's not just a technical tweak but a business necessity. A faster site brings higher conversions, cheaper PPC, better SEO chances, and happier visitors.

Specific Adjustments: Surgical Tweaks Instead of Revolution

We broke down Srovname.cz and focused on low-hanging fruit, such as:

Lean CSS: Fewer Files, Faster Speed
We combined all styles into one file and minimized it. Critical CSS (styles needed for the first screen) was embedded directly into the HTML.
Parallel Processing with Asynchronous JavaScript
The issue was that all JavaScript loaded sequentially, blocking content display. We changed it to asynchronous loading, so important content appears immediately, and less critical scripts load in the background. Users see the page instantly, and interactive elements refine later.
SVG Graphics: Vector Icons Instead of Pixel Images
We converted main icons and components to SVG and embedded them directly into the HTML. The browser didn't need to download dozens of small images separately.

Collaboration with the Srovname.cz team was perfect. Adjustments were smooth and in real-time.

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Measurable Results: Pages Up to 80% Faster

Optimization without measurement is just shooting in the dark. We mainly used WebPageTest.org and the Speed Index metric for measurement back then.

Speed Index (SI) measures how quickly page content gradually displays to the user. The lower the number, the faster the loading. This metric was important in 2016, but today it's outdated—we now use more modern loading speed indicators like Largest Contentful Paint (LCP).

How Did the Optimizations for Srovname.cz Turn Out?

Page	Speed Index Before	Speed Index After	Improvement
Homepage	6,664 ms	1,340 ms	80% faster
Product List	3,654 ms	2,275 ms	38% faster
Product Detail	4,001 ms	1,506 ms	62% faster

Content on mobile now displays in under 1.5 seconds instead of the previous six seconds. That’s a difference users notice at first glance.

Synthetic metrics showed dramatic improvement. But what did the users say?

Conversions: Where True Value Shows

The conversion rate on Srovname.cz indicates how many users click through from the comparison site to the e-shop detail. How did it change after optimization?

Device	Conversion Rate Change
Desktop	+1.3%
Tablet	+4.5%
Mobile	+24.8%

We've achieved nearly a 25% increase in mobile conversion rate, which is fantastic.

Data Source: Google Analytics. Comparing the period from April 14, 2016, to April 13, 2017, with the same period the previous year. Measured on traffic in the high hundreds of thousands. For mobile, it's in the higher tens of thousands.

For Srovname.cz, we had the advantage of minimal other changes on the site at the time, so the impact of speed is seen in its purest form.

What's next? Optimization is not a one-time action

Website speed isn't a goal you achieve once and then forget. As every website evolves, speed tends to degrade.

Speed should be part of your business processes, or you're paying unnecessarily.

The PageSpeed.ONE team can assist you with automated monitoring, expert oversight, training, or high-level services like assessing the impact of speed on business.

The optimization of Srovname.cz showed that website speed is not a technical gimmick but a business advantage. Especially on mobile: faster site = more money.