Case study: technical SEO and CWV = +70% of organic traffic
Organic traffic has been growing for a year now due to quality, not tricks. The key reason is the technical optimization of the site and stable Core Web Vitals. In this case study, WonderWeb shows how a comprehensive approach to SEO optimization and performance work resulted in +70% of organic sessions and a significant increase in conversions without expanding the advertising budget.
Page metrics, including Core Web Vitals, affect the overall user experience.
Improving the speed and stability of the interface correlates with better visibility in search.
Google Search Central, 2023
🚀 Background and goals
The client is an online store in the mid-range segment with seasonal peaks in demand. Problems: slow loading, CLS spikes on mobile, duplicate pages due to filters and incorrect canonicals, bloated JavaScript, and lack of a clear redirect map. The goal was to return stable organic growth through technical improvements and CWV prioritization.
We relied on a full cycle: technical audit, implementation plan, development, and quality control. The task was performed cross-functionally: SEO specialists, front-end, back-end, and content. For new modules and edits, we engaged a development team using the approach of individual solutions without templates. If you also need a team that takes responsibility for the result, we advise you to contact WonderWeb website development and SEO promotion.
🧩 Technical strategy and work plan
Indexing framework and clean URLs
First, we normalized the indexing. We set up canons for pagination and filters, closed garbage parameters. We aligned sitemap.xml to the real structure and unified 3xx chains. This reduced the number of pages in the index coverage by 18% without losing relevant traffic.
JS/CSS and rendering optimization
We broke down gangs, introduced conditional loading of widgets, and postponed non-critical scripts. Critical styles are inline. We switched some elements to CSS animations and reduced the number of DOM nodes in product card templates. The result is a significant reduction in the time to interaction and more stable rendering.
Media and caching
We enabled WebP/AVIF, implemented srcset and lazy-loading adaptive images. We optimized the cache for catalog pages and cards. After the implementation, network costs decreased and repeat visits became noticeably faster 🙂.
📊 Core Web Vitals: before and after metrics
We measured progress on mobile templates. Control period: 90 days before and 90 days after the main implementation.
| Results | Before | Became |
|---|---|---|
| LCP | 4,8 с | 2,2 с |
| CLS | 0,25 | 0,05 |
| INP | 380 ms | 180 ms |
We achieved the LCP improvement by optimizing the critical rendering path, prioritizing hero images, and removing blocking scripts. Layout offsets decreased after reserved containers for banners and icons. INP was reduced by debouncing events and simplifying the logic on the client.
What it did for search
6 weeks after the release, we saw an acceleration in the indexing of new pages and better stability of positions for commercial queries. This is a classic effect: technical optimization of the site improves the quality of crawling, which enhances the result of SEO promotion without additional risks.
📈 Results: traffic and conversions
Comprehensive changes have had a measurable effect. Here are the key metrics in the organic channel section.
- Traffic and visibility. +70% of organic sessions, +55% of clicks on non-branded keys, +22% of impressions in the top 10.
- Monetization. 32% increase in conversions on mobile. The average time to first interaction decreased by 41%, which reduced the outflow from the catalog.
- Session quality. Bounce rate decreased by 19%, pages per session increased by 14%.
It is important that we did not change prices or increase advertising budgets. To maintain demand, we additionally tested synergies with paid traffic. If you are looking for a controlled expansion of your reach, take a closer look at Google ADS contextual advertising or smm promotion, and for quick promotions, use META ADS targeted advertising.
Content and internal linking
We worked with metadata templates, fixed duplicate H1s, and simplified breadcrumbs. We made deeper linking of categories. Thanks to this, long-tail pages gained relevance faster when promoting the site in dynamic niches.
🛠️ How we organized the process
Implementation schedule
We divided the work into sprints of 2 weeks each. At the beginning, we started with an audit and prioritization of tasks by their impact on CWV and indexing. Then we went in parallel: front-end optimization and fixing indexing errors. At the end of each sprint, we performed measurements, regression tests, and backlog updates.
Quality control and metrics
For checks, we used user scenarios on mobile, monitored the stability of product card templates and categories. An important detail: we recorded not only average values but also the 75th percentile. This is closer to the real experience of visitors.
What we advise business owners
Focus on practical benefits. SEO optimization works best when the technical base is strong and the content matches the search intent. If you don’t have an internal team, delegate the full cycle in one go – WonderWeb has 20+ specialists and more than 150 completed projects. We will cover strategy, development, analysis, and support.
Need a customized roadmap for your stack and niche? Order an audit and further SEO promotion. To redesign or implement a new catalog, contact website design.
Case summary
Technical optimization of the site plus work with Core Web Vitals can increase organic traffic without increasing advertising costs. In our case, this is +70% of organic sessions and a significant increase in conversions on mobile. A systematic approach to website promotion wins in the long run because it improves both the user experience and search signals.
Ready for the next step? Let WonderWeb handle the technical side of SEO and focus on the product. We will take care of stable metrics and predictable growth 💡.
Holiday attention bonus. On the eve of Black Friday, Cyber Monday and Christmas sales, seize the moment. Fast-loading pages win during peak traffic. Visit the WonderWeb website to learn more about seasonal opportunities for SEO promotion and comprehensive upgrades. More heat, less load, higher rankings – sounds like the perfect gift for your business.
What Core Web Vitals indicators were improved in the case study?
Within 90 days, LCP decreased from 4.8 seconds to 2.2 seconds, CLS from 0.25 to 0.05, and INP from 380 ms to 180 ms. The improvement was achieved by optimizing rendering, media, and scripts.
What is the real impact of technical optimization on traffic and conversions?
+70% of organic sessions and +32% of conversions on mobile after the major releases. Additionally, we see +55% of clicks on non-branded queries and -19% of bounces.
What key technical steps did the WonderWeb team take?
Indexing normalization (cannons, sitemaps, redirects), JS bundle splitting and deferred loading, critical CSS inline, WebP/AVIF, lazy-loading, media space reservation to reduce CLS.
How long did the changes take and how did you organize the process?
The work was carried out in sprints of 2 weeks with parallel frontend and indexing tracks. Control measurements were taken 90 days before and 90 days after the releases.
What is the difference between WonderWeb’s approach and template solutions?
We implement a full cycle from strategy to support, provide individual solutions without templates, and rely on a team of 20+ specialists with 150+ projects. This allows us to align technology, content, and business goals.
