Why is Your Google Ads Account's 'Quality Score' Dropping in 2026? The Impact of Landing Page Experience and Lighthouse Scores on Ad 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 each morning? In the competitive digital atmosphere of 2026, it's no coincidence that your ad performance is declining while your keywords remain the same. Many marketing managers and business owners are trying to solve this problem by simply increasing their bids; however, the real issue is often hidden not in the ad panel but in those first seconds when you greet the user, namely in your Landing Page experience.

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

What is the Ad Quality Score?

The Ad Quality Score is an estimated score between 1 and 10 that Google Ads assigns based on the quality of your ads, their relevance to your keywords, and user experience. This score consists of components such as expected click-through rate, ad relevance, and landing page experience, and it is the most critical metric that directly determines your ad rank and the cost per click you will pay.

In practice, we often see this: Many advertisers mistakenly think of the quality score as merely related to the words in the ad text. However, by 2026 standards, Google's AI-powered bots scan your page within seconds, measuring its technical capacity. The key to succeeding in the Google advertising process is no longer just about choosing the right word, but delivering the solution that word promises as quickly as possible.

A modern digital dashboard showing Google Ads Quality Score metrics

Technical Reasons for Lowering the Quality Score in 2026

In previous years, slow pages were somehow managed, but in 2026, they are penalized with very high costs even if they are not marked by Google as "not suitable for advertising." Based on our experience working with clients, the biggest hidden culprit behind a low-quality score is often the page loading speed and interaction quality. Google does not want to send traffic to a page that makes users unhappy and only accepts that risk by taking more money from you.

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 how quickly the page responds to user interactions, such as clicking a button or starting to fill out a form when the user clicks on your page. A slow-responding page leads to user abandonment; this signifies a "low-quality experience" in Google's eyes.

In a real scenario with one of our e-commerce clients; the quality score of the keywords was at 4/10 levels. When we reduced the page response time to below 200ms with just a technical optimization, we observed that the score increased to 8/10 without making any changes to the ad text, and costs decreased by 35%. This situation exactly aligns with the Google Ads costs 2026 data: Technical excellence equals financial savings.

The Direct Impact of Lighthouse Scores on Ad Costs

Google Lighthouse is an open-source tool that measures the performance, accessibility, and SEO compliance of your web page. Although Lighthouse scores are not continuously monitored in the Google Ads panel, these metrics, which show the fundamental performance and user experience of the web page, have a strong impact on landing page experience, one of the essential components of Quality Score. If your Lighthouse performance score is low, it is inevitable that you will lag behind your competitors in ad auctions. This can mean that you have to 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. While these data are not the exact rates officially published by Google, they reflect the general principle that low performance leads to cost increases, and high performance lowers 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; don't focus solely on desktop scores. Mobile devices account for about 63% of Google ad clicks. Therefore, if your Lighthouse mobile performance score is low, it may cause a significant portion of your digital budget to go to waste. You can perform basic visual optimization; however, obtaining 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 the quality score does not happen overnight, but with the right strategies, you can achieve noticeable reductions in your costs within a few weeks. Here are the golden rules you should implement 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 directly describes CRM features rather than a general homepage.
• Visual Optimization and Next-Gen Formats: Using JPEG or PNG in 2026 is a big mistake. Convert all visuals on your page to AVIF or WebP format. This will improve your LCP (Largest Contentful Paint) score, creating positive momentum in your Google Search Console data.
• Reduce Unnecessary JavaScript Load: Third-party tracking codes and heavy libraries hinder page interaction speed. Optimize script loading using async and defer attributes.
• Accessibility and Readability: Google Ads bots do not just look at speed; they also analyze whether the page is usable by everyone (text contrast, button sizes, etc.). A high accessibility score positively reflects on the quality score indirectly.

"The quality score is not just a number; it is an efficiency report presented to you by Google. Trying to increase the budget without correcting this report is akin to trying to fill a leaky pool with water."

In a project we conducted with an industry-leading firm, we raised 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 expense of 100,000 TL increased by 45%. This success is evidence of how vital it is to work with the right Google ad 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). Page opening speeds over this duration can adversely affect user experience, lowering your Google Ads performance.
• Lighthouse is a Guide: Check your performance score after each update; low scores pose a risk of cost increase.
• User Focus: Google's algorithm closely monitors how long the user spends on the page and their engagement (not bounce rate, but engagement rate).
• Mobile Priority: Always conduct your optimization based on the lowest-spec mobile devices.
• Continuous Monitoring: Quality score is dynamic; your score can decrease when competitors boost their site speeds.

Frequently Asked Questions

Why might my quality score have suddenly dropped?

There could be several reasons for this: An update to your website may have slowed down page speed, competitor ads may have become more relevant than yours, or your ad texts may have become outdated (ad fatigue) over time. Additionally, an update in Google’s 2026 algorithms may have increased the weight of technical criteria.

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

Generally, a 20% improvement in technical scores can contribute 1-2 points to your quality score. This can lead to savings of 15% to 25% in the CPC you pay for the same position in ad auctions.

Does a low-quality score prevent my ad from being shown at all?

Yes, if your quality score is 1 or 2, Google may decide that your ad's relevance is very low and place it in the "rarely shown" category. In this case, no matter how high your bid is, you cannot surpass well-scoring competitors.

Does hosting performance affect the quality score?

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

Is landing page speed sufficient on its own?

Speed is a very important foundation, but it is not sufficient on its own. The content of the page must fulfill the promise made in the ad and include a clear call to action (CTA). If a user quickly enters the page but leaves without finding what they are searching for, this negatively impacts the quality score.

Conclusion: Stay One Step Ahead of the Competition in 2026

In the world of Google Ads, 2026 has become a period where not just those who put money on the table win, but those who provide the fastest and most accurate experience to users. You should set your Lighthouse scores as a primary KPI (Key Performance Indicator) to raise your quality score and permanently lower your advertising costs. Advertising with a weakly structured website is akin to carrying water in a bucket with holes.

As 212 Medya, with our years of industry experience, we not only manage ads; we optimize the technical architecture behind your ads to ensure you get value for every penny. If you need a professional partner at every stage, from the technical analysis of your website to the structuring of your advertising strategy, our team is ready to offer you tailor-made solutions. Start planning your strategy with us today for higher quality scores and lower-cost conversions.

You can strengthen your presence in the digital world and elevate your Google Ads performance by contacting our expert team and requesting a performance audit tailored for your business. Don’t fall behind the competition, set the rules of the digital space with 212 Medya.