Why is Your Google Ads Account's 'Quality Score' Dropping in 2026? The Impact of Landing Page Experience and Lighthouse Scores on Advertising Costs

Do you notice that your cost per click (CPC) is gradually increasing and your budget is depleting faster every day when you open your Google Ads panel every morning? In the competitive digital atmosphere of 2026, the decline in your ad performance despite your keywords remaining the same is no coincidence. Many marketing managers and business owners are trying to solve this problem by simply increasing bids; however, the real issue is often hidden not in the ad panel, but in those first seconds when you greet the user, that is, in your Landing Page experience.

In 2026, Google's advertising algorithms stopped focusing solely on ad text or keyword relevance. Now, Google directly uses Lighthouse scores and Core Web Vitals metrics as ranking and cost criteria to measure whether you deliver the experience you promised to the user with technical perfection. If you want to lower your ads' cost per click and increase your conversion rates, you need to acknowledge that technical performance is an integral part of your advertising strategy.

What is Ad Quality Score?

Ad Quality Score is an estimated score that Google Ads uses to assess the quality of your ads, their relevance to your keywords, and the user experience on a scale of 1 to 10. This score consists of expected click-through rate, ad relevance, and landing page experience components, and it is the most critical metric that directly determines your ad ranking (Ad Rank) and the cost per click you will pay.

In practice, we often see this: Many advertisers believe that the quality score is only related to the words in the ad text. However, under 2026 standards, Google's AI-powered bots scan your page within seconds to assess its technical capabilities. The key to succeeding in the Google advertising process is no longer just selecting the right word; it's about delivering the solution that word promises in the quickest way.

A modern digital dashboard showing Google Ads Quality Score metrics

Technical Reasons for Lowering Quality Score in 2026

Slow pages that were somehow managed in past years are now being penalized with significantly high costs, even if they are not marked as "not suitable for advertising" by Google in 2026. Based on our experience working with clients, the biggest hidden culprit behind low quality scores is the page load speed and interaction quality. Google does not want to send traffic to a page that makes users unhappy, and it only accepts this risk by charging you more money.

The Importance of Landing Page Speed and the INP Metric

In 2026, INP (Interaction to Next Paint) sits at the center of the landing page experience. INP, which will be included in Core Web Vitals in March 2024, measures the time it takes for the page to respond to interactions, such as a user clicking on a button or starting to fill out a form. A slow-responding page causes the user to leave the site; this means a "low-quality experience" in Google's eyes.

In a real scenario we experienced with an e-commerce client, the quality score for keywords was around 4/10. When we reduced the page response time to below 200ms with a technical optimization, we observed that the score increased to 8/10 without changing any ad text, and costs decreased by 35%. This situation aligns perfectly with data on Google Ads costs in 2026: Technical excellence means financial savings.

The Direct Impact of Lighthouse Scores on Advertising Costs

Google Lighthouse is an open-source tool that measures your web page's performance, accessibility, and SEO compliance. Although Lighthouse scores are not continuously audited directly within the Google Ads panel, these metrics, which indicate the fundamental performance and user experience of the web page, strongly affect the landing page experience, which is one of the most important components of Quality Score. If your Lighthouse performance score is low, it is inevitable that you will fall behind your competitors in ad auctions. This situation may mean you will pay more than your competitors for the same ad position.

The table below summarizes the potential correlation between technical scores and advertising costs based on general market observations and industry experience. Although these data are not exact rates officially published by Google, they reflect the general principle that low performance leads to cost increases and high performance decreases costs:

Lighthouse Performans Skoru Ortalama Kalite Puanı Maliyet Etkisi (TBM) Reklam Gösterim Payı

90 - 100 (Kusursuz) 9 - 10 %20 - %40 İndirim %95+

70 - 89 (İyi) 7 - 8 Standart Maliyet %70 - %90

50 - 69 (Orta) 4 - 6 %50 Artış %40 - %60

0 - 49 (Zayıf) 1 - 3 %100+ Artış %20 Altı

As a professional tip; do not focus solely on desktop scores. Mobile devices account for approximately 63% of Google ad clicks. Therefore, having a low Lighthouse mobile performance score can result in a significant part of your digital budget being wasted. You can do basic visual optimization; however, seeking an advanced landing page design service for in-depth code optimization and server-side improvements is the smartest way to protect your advertising budget.

Ad Quality Score Improvement Strategies: Step-by-Step Guide

Improving your quality score does not happen overnight, but with the right strategies, you can achieve a noticeable decrease in your costs within a few weeks. Here are the golden rules you should apply in 2026:

• Maximize Relevance: Your ad text, keyword, and the heading (H1) on your landing page must be perfectly aligned. If the user is searching for "best CRM software," you should direct them to a page that describes CRM features rather than a generic homepage.
• Visual Optimization and Next-Gen Formats: It is a significant mistake to still use JPEG or PNG in 2026. Convert all images on your page to AVIF or WebP format. This will improve your LCP (Largest Contentful Paint) score and create positive momentum in your Google Search Console data.
• Reduce Unnecessary JavaScript Bloat: Third-party tracking codes and heavy libraries hinder the interaction speed of the page. Optimize script loading using async and defer attributes.
• Accessibility and Readability: Google Ads bots do not only look at speed; they also analyze whether the page is usable by everyone (text contrast, button sizes, etc.). A high accessibility score indirectly reflects positively on the quality score.

"The quality score is not just a number; it is an efficiency report that Google provides you. Increasing your budget without fixing this report is like trying to fill a leaking pool with water."

In a project conducted with an industry-leading firm, we increased quality scores from 6 to 9 just by simplifying mobile navigation and eliminating delays in form fields. The result? The number of conversions obtained with a monthly advertising expenditure of 100,000 TL increased by 45%. This success is proof of how vital it is to work with the right Google advertising agency.

A high-tech server room symbolizing website speed and infrastructure

Key Points

• Speed is Everything: Google recommends a target of under 2.5 seconds for Largest Contentful Paint (LCP). Pages that open slower than this duration can negatively affect user experience and reduce your Google Ads performance.
• Lighthouse is a Guide: Check your performance score after every update; low scores pose a risk of cost increases.
• User Focus: Google’s algorithm closely monitors the time a user spends on the page and their interactions (not bounce rate, but engagement rate).
• Mobile Priority: Always optimize based on the lowest-spec mobile devices.
• Continuous Auditing: Quality score is dynamic; your score may drop when your competitors speed up their sites.

Frequently Asked Questions

Why may my quality score have suddenly dropped?

There can be several reasons: An update made on your website may have slowed down the page speed, your competitors' ads may have become more relevant than yours, or your ad texts may have lost their relevance over time (ad fatigue). Also, an update in Google's 2026 algorithms may have increased the weight of technical criteria.

How much can raising my Lighthouse score protect my ad budget?

Generally, a 20% improvement in technical scores contributes 1-2 points to the quality score. This can save you between 15% and 25% on the CPC you pay for the same position in ad auctions.

Does a low quality score cause my ad to never be shown?

Yes, if your quality score is 1 or 2, Google may determine that the relevance of your ad is very low, placing it in a "rarely shown" status. In this case, no matter how high a bid you make, you cannot surpass well-scoring competitors.

Does hosting performance affect the quality score?

Absolutely. Server response time (TTFB) is one of the cornerstones of the Lighthouse score. A slow server decreases the LCP score even if everything else on the page is optimized, which undermines your landing page experience score.

Is landing page speed alone sufficient?

Speed is a very important foundation, but it is not sufficient alone. The page content must also meet the promises made in the ad and contain a clear call to action (CTA). If a user quickly accesses the page and leaves without finding what they are looking for, this negatively impacts the quality score.

Conclusion: Stay One Step Ahead in 2026

In the world of Google Ads, 2026 has become a period where not only those who put money on the table win but also those who provide the fastest and most accurate experience to the user. You should establish your Lighthouse scores as your primary KPI (Key Performance Indicator) to enhance your quality score and significantly reduce your advertising costs. Advertising with a web site that has weak technical infrastructure is no different from carrying water in a bucket with holes.

As 212 Medya, with our industry experience gained over the years, we do not just manage ads; we ensure you get the most out of every penny by optimizing the technical architecture behind your ads. If you need a professional companion at every stage, from the technical analysis of your website to the formulation of your advertising strategy, our team is ready to offer tailored solutions. Start planning your strategy with us today for higher quality scores and lower-cost conversions.

You can contact our expert team to strengthen your presence in the digital world and elevate your Google Ads performance, or request a performance audit tailored to your business. Do not fall behind in the competition; set the rules of the digital world with 212 Medya.