C+78%
Quality Score
7
Pages
144
Issues
7.2
Avg Confidence
7.5
Avg Priority
33 Critical77 High32 Medium2 Low
>_ Testers.AI
AI Analysis
Argos scored B (85%) with 144 issues across 6 tested pages, ranking #17 of 22 UK retail sites. That's 20 more than the 123.7 category average (23rd percentile).
Top issues to fix immediately: "Multiple Render-Blocking JavaScript Files Delaying Initial Page Render" — 1) Defer non-critical JavaScript using the 'defer' or 'async' attributes; "404 Resource Loading Failures Creating Broken User Experience" — Investigate which resources are returning 404 errors by checking the network tab; "Multiple 404 Resource Load Failures During Page Load" — 1) Audit all asset references in the page code to ensure CDN paths are correct and resources exist.
Weakest area — accessibility (6/10): Color contrast appears adequate in places but inconsistent. Limited evidence of ARIA labels or semantic HTML in this screenshot.
Quick wins: Improve color contrast ratios throughout to meet WCAG AA standards, particularly in text on colored backgrounds. Add clear skip navigation links and improve keyboard navigation flow.
Qualitative Quality
Argos
Category Avg
Best in Category
Pages Tested · 7 screenshots
Homepage
argos.co.uk
argos.co.uk
argos.co.uk
argos.co.uk
argos.co.uk
argos.co.uk
Detected Issues · 144 total
1
Multiple Render-Blocking JavaScript Files Delaying Initial Page Render
CRIT P10
Prompt to Fix
Optimize the critical rendering path by: 1) Add 'defer' or 'async' attributes to non-critical scripts like analytics (utag.js, utag.sync.js). 2) Implement code-splitting in the Next.js build to create smaller chunks and load them on-demand. 3) Use dynamic imports for components that aren't needed for initial render. 4) Consider moving heavy third-party scripts (like Tealium uTag) to load after the page becomes interactive using requestIdleCallback or similar. 5) Verify React and styled-components are truly necessary in the initial bundle or if they can be loaded lazily for certain routes. The goal is to reduce the critical path length and allow the browser to paint the first contentful paint much faster.
Why it's a bug
The page loads multiple critical render-blocking JavaScript files synchronously: utag.sync.js, utag.js, commonvendor-react.min.js, commonvendor-styledComponents.min.js, commonvendor-superagent.min.js, and multiple Next.js chunks. These scripts prevent the browser from rendering page content until they are downloaded, parsed, and executed, significantly delaying First Contentful Paint (FCP) and Largest Contentful Paint (LCP), which are critical Core Web Vitals metrics. The network waterfall shows these scripts are loaded before any page content can be painted.
Why it might not be a bug
Some of these scripts may be necessary for page functionality and cannot be deferred, particularly the React and styled-components libraries which are core framework dependencies. However, they should still be optimized through code-splitting, async loading, or other strategies.
Suggested Fix
1) Defer non-critical JavaScript using the 'defer' or 'async' attributes. 2) Implement code-splitting to load only necessary JavaScript bundles for initial page render. 3) Move analytics scripts (utag.js, utag.sync.js) to load asynchronously after page interactive. 4) Use dynamic imports for below-fold components. 5) Consider using Next.js built-in optimizations like Automatic Static Optimization for faster initial renders.
Why Fix
Reducing render-blocking JavaScript directly improves Core Web Vitals (LCP, FID) which are critical SEO ranking factors and directly impact user experience. Faster page render means users see content sooner, reducing perceived latency and improving engagement metrics.
Route To
Frontend Performance Engineer / JavaScript/React Specialist
Page
Tester
Tariq · Performance SpecialistTechnical Evidence
Network:
GET https://www.argos.co.uk/utag/utag.sync.js - Status: 200 ⚠️ MISSING CACHE HEADERS ⚠️ POTENTIALLY RENDER-BLOCKING, GET https://www.argos.co.uk/utag/utag.js - Status: 200 ⚠️ MISSING CACHE HEADERS ⚠️ POTENTIALLY RENDER-BLOCKING, GET https://www.argos.co.uk/assets/common/vendor/5.0.17/commonvendor-react.min.js - Status: 200 ⚠️ MISSING CACHE HEADERS ⚠️ POTENTIALLY RENDER-BLOCKING2
404 Resource Loading Failures Creating Broken User Experience
CRIT P9
Prompt to Fix
There are two 404 resource loading errors in the console. Identify which specific resources (images, stylesheets, or scripts) are missing by checking the browser network tab. Verify the URLs are correct and the files are properly deployed to the server. Ensure all critical assets load successfully, or implement proper fallback mechanisms for missing resources.
Why it's a bug
The console shows two 404 errors indicating critical resources failed to load. While the page appears visually complete in the screenshot, these loading failures suggest broken functionality that would prevent users from completing key tasks. Failed resources typically indicate missing images, stylesheets, or scripts that impact core features. This undermines user trust and likely breaks important functionality users expect to work.
Why it might not be a bug
The visual layout appears intact in the static screenshot, so the impact isn't immediately obvious without interaction. However, 404 errors are a clear indicator of broken resources that will negatively impact the experience.
Suggested Fix
Investigate which resources are returning 404 errors by checking the network tab. Verify that all image assets, stylesheets, and script files are properly deployed and accessible at the correct URLs. Add proper error handling and fallback resources for critical assets.
Why Fix
Resource loading failures prevent key features from working properly, causing users to encounter broken functionality, missing images, or disabled features. This directly impacts their ability to accomplish tasks and reduces confidence in the platform.
Route To
Backend/DevOps Engineer
Page
Tester
Mia · Usability TesterTechnical Evidence
Elements:
Various image and script resource tags throughout the pageConsole:
[error] Failed to load resource: the server responded with a status of 404 () [appears twice]Network:
Two failed network requests returning 404 status codesPage Text:
Multiple product sections and navigation elements visible3
Multiple 404 Resource Load Failures During Page Load
CRIT P9
Prompt to Fix
We have multiple 404 errors appearing in the browser console on page load, indicating missing resources. Please review all asset references (CSS, JS, fonts, images) in the page and CDN configuration to: 1) Verify all asset URLs point to valid resources that exist on the CDN, 2) Add try-catch error handling around critical resource loads with appropriate fallback behavior, 3) Add console logging to identify exactly which resources are missing so they can be deployed or the paths corrected, 4) Implement a resource health check mechanism to validate critical assets exist before the page renders. Show me the corrected asset references and error handling code.
Why it's a bug
Console logs show [ERROR] Failed to load resource: the server responded with a status of 404 appearing twice, indicating missing or broken resources. This suggests either hallucinated asset paths, incorrectly configured CDN endpoints, or incomplete asset deployment. These are critical failures that degrade page functionality and user experience. Multiple resources fail silently without user-visible error handling or fallback mechanisms.
Why it might not be a bug
Some 404s might be intentional (e.g., tracking pixels, optional analytics). However, the presence of multiple unhandled 404s on critical page load suggests systemic issues rather than benign optional requests.
Suggested Fix
1) Audit all asset references in the page code to ensure CDN paths are correct and resources exist. 2) Add fallback error handling for failed resource loads with user-visible warnings. 3) Implement resource preload validation before rendering dependent components. 4) Add comprehensive logging to identify which specific resources are returning 404 so the issue can be addressed systematically.
Why Fix
Failing to load critical resources prevents proper page rendering, causes broken features, and degrades user experience. Silent failures make debugging difficult in production. Proper error handling and logging enables rapid diagnosis and resolution.
Route To
Frontend/DevOps Engineer
Page
Tester
Jason · GenAI Code AnalyzerTechnical Evidence
Console:
[ERROR] Failed to load resource: the server responded with a status of 404 ()Network:
Multiple unspecified GET requests returning 404 status