Performance
· 17 checks — Lighthouse + waterfall + sustainability rolled into one auditable list.Performance-focused optimization plan with CWV assessment, top offenders, and time estimates
First Contentful Paint First Contentful Paint — how long until the browser renders the first piece of content. Under 1.8s is good.
4.53 s
Largest Contentful Paint Largest Contentful Paint — how long until the largest visible element loads. Under 2.5s is good.
8.43 s
Total Blocking Time Total Blocking Time — total time the main thread was blocked, preventing user input. Under 200ms is good.
624 ms
Cumulative Layout Shift Cumulative Layout Shift — measures visual stability. How much the page layout shifts during loading. Under 0.1 is good.
0.002
Speed Index Speed Index — how quickly content is visually displayed during load. Under 3.4s is good.
6.65 s
Time to Interactive Time to Interactive — how long until the page is fully interactive and responds to user input. Under 3.8s is good.
15.48 s
Page Load Progression
FPage Weight BudgetAction2.7 MB transferred, 53 requestsFIX
Large JavaScript bundles delay interactivity. Split code by route or defer non-critical scripts.
JavaScript bundle is large — code-split routes and lazy-load off-screen components to defer.
Source: web.dev
DThird-Party ImpactAction100% third-party, 0 ms blockingFIX
FJS Execution CostAction3765ms total JS executionFIX
Main Thread Breakdown
| Script | Total | Scripting | Parse/Compile | Party |
|---|---|---|---|---|
| https://www.gstatic.com/recaptcha/releases/gTpTIWhbKpxADzTzkcabhXN4/recaptcha__en.js | 861ms | 720ms | 113ms | 3rd |
| https://www.googletagmanager.com/gtm.js?id=GTM-NBWPCZW | 643ms | 520ms | 90ms | 3rd |
| Unattributable | 485ms | 36ms | 0ms | 3rd |
| https://www.coca-cola.com/es/es | 483ms | 12ms | 6ms | 3rd |
| https://www.coca-cola.com/onexp-theme/a0a44e9273faa9d6b40f7e0ced094dab7c06c127eb83ca95124fe72946943e03/theme.js | 433ms | 6ms | 9ms | 3rd |
| https://www.coca-cola.com/onexp-theme/a0a44e9273faa9d6b40f7e0ced094dab7c06c127eb83ca95124fe72946943e03/splide.esm.js | 279ms | 91ms | 0ms | 3rd |
| https://www.googletagmanager.com/gtm.js?id=GTM-MLD3XV4L>m=4e64h1 | 207ms | 145ms | 61ms | 3rd |
| https://www.coca-cola.com/etc.clientlibs/cep/clientlibs/clientlib-cwr.lc-085b194b52d77cc30f6cc60ab771e406-lc.min.js | 124ms | 99ms | 24ms | 3rd |
| https://www.coca-cola.com/etc.clientlibs/onexp/clientlibs/clientlib-base.lc-7a24a291d40ac2c0290fc699b9f9a90e-lc.min.js | 121ms | 114ms | 6ms | 3rd |
| https://www.coca-cola.com/onexp-theme/a0a44e9273faa9d6b40f7e0ced094dab7c06c127eb83ca95124fe72946943e03/theme.css | 72ms | 0ms | 0ms | 3rd |
Showing top 10 of 11 scripts
FJS BundlesAction17 scripts, 844 KB unusedFIX
Downloaded but never executed on this page.
| Script | Size | Unused | Minified | Party |
|---|---|---|---|---|
| https://www.gstatic.com/recaptcha/releases/gTpTIWhbKpxADzTzkcabhXN4/recaptcha__en.js | 362 KB | 177 KB (49%) | ✓ | 3rd |
| https://www.gstatic.com/recaptcha/releases/gTpTIWhbKpxADzTzkcabhXN4/recaptcha__en.js | 0 KB | 177 KB (49%) | ✓ | 3rd |
| https://www.gstatic.com/recaptcha/releases/gTpTIWhbKpxADzTzkcabhXN4/recaptcha__en.js | 362 KB | 177 KB (49%) | ✓ | 3rd |
| https://www.googletagmanager.com/gtm.js?id=GTM-MLD3XV4L>m=4e64h1 | 161 KB | 88 KB (55%) | ✓ | 3rd |
| https://www.coca-cola.com/onexp-theme/a0a44e9273faa9d6b40f7e0ced094dab7c06c127eb83ca95124fe72946943e03/theme.js | 100 KB | 73 KB (73%) | ✓ | 3rd |
| https://www.googletagmanager.com/gtm.js?id=GTM-NBWPCZW | 207 KB | 70 KB (34%) | ✓ | 3rd |
| https://cdn.global.gcds.coke.com/emea/sdk/latest.js?v6 | 73 KB | 52 KB (72%) | ✓ | 3rd |
| https://www.coca-cola.com/etc.clientlibs/cep/clientlibs/clientlib-cwr.lc-085b194b52d77cc30f6cc60ab771e406-lc.min.js | 53 KB | 30 KB (57%) | ✓ | 3rd |
| https://www.coca-cola.com/etc.clientlibs/core/wcm/components/commons/site/clientlibs/container.lc-0a6aff292f5cc42142779cde92054524-lc.min.js | 1 KB | — | ✓ | 3rd |
| https://www.coca-cola.com/etc.clientlibs/onexp/clientlibs/clientlib-base.lc-7a24a291d40ac2c0290fc699b9f9a90e-lc.min.js | 13 KB | — | ✗ | 3rd |
Consider code splitting or tree shaking to reduce unused code.
This bundle has high unused code — code-split or tree-shake to ship only what executes.
Source: web.dev / Lighthouse coverage
Consider code splitting or tree shaking to reduce unused code.
This bundle has high unused code — code-split or tree-shake to ship only what executes.
Source: web.dev / Lighthouse coverage
Consider code splitting or tree shaking to reduce unused code.
This bundle has high unused code — code-split or tree-shake to ship only what executes.
Source: web.dev / Lighthouse coverage
Consider code splitting or tree shaking to reduce unused code.
This bundle has high unused code — code-split or tree-shake to ship only what executes.
Source: web.dev / Lighthouse coverage
Consider code splitting or tree shaking to reduce unused code.
This bundle has high unused code — code-split or tree-shake to ship only what executes.
Source: web.dev / Lighthouse coverage
FPage Weight InventoryAction53 resources · 2.7 MB · 844 KB savings availableFIX
~844.3 KiB of savings available
| # | Resource | Type | Size | Cache | Unused | 3rd party | Issues |
|---|---|---|---|---|---|---|---|
| — | — | ||||||
| 53 resources | 2.7 MiB | ||||||
FHTTP CachingActionNo cache headersFIX
No Cache-Control header
Adding a Cache-Control header can significantly improve repeat-visit performance.
BImage Optimization20 images, 0 KB saveableREVIEW
Set explicit width and height to prevent CLS.
Performance issues directly impact user engagement and conversion rates.
Set explicit width and height to prevent CLS.
Image without explicit width/height — browser can't reserve space; CLS jumps when image loads.
Source: web.dev / Core Web Vitals
Set explicit width and height to prevent CLS.
Image without explicit width/height — browser can't reserve space; CLS jumps when image loads.
Source: web.dev / Core Web Vitals
CGreen HostingActionWhether the site is served from green-energy infrastructureREVIEW
Green Hosting
No green hosting detected
A+Text CompressionAll text resources are compressedPASS
A+Font Loading4 fonts (175 KB)PASS
Web fonts
4
175 KB total
Render-blocking
0
of 4
Dominant font-display
swap
Most common across fonts
Font loading timeline
- Convert to woff2 for ~30% smaller file size
Optimization checklist
- Preload critical fonts (priority=high)
- Use woff2 format for all fonts
- Set font-display to swap, optional, or fallback
- Subset large fonts (≤100 KB each)
Fixing the unchecked items could save ~6 KB and ~12 ms
A+Resource CachingAll resources properly cachedPASS
A+Critical Rendering PathNo render-blocking resourcesPASS
A+Resource HintsNo optimization neededPASS
A+Render-Blocking ResourcesNo render-blocking resources detectedPASS
A+Third-Party ResourcesNo third-party resources detectedPASS
Network Waterfall53 requests over 1998msINFO
Third-Party Script CostPer-script blocking time, transfer cost, and cache headersINFO
| Script | Category | Execution | Transfer | Unused | Monthly Cost | Verdict |
|---|---|---|---|---|---|---|
www.gstatic.com www.gstatic.com | Other | 861ms | 0 KB | 49% | €9/mo | Costly |
Google Tag Manager www.googletagmanager.com | Tag Manager | 643ms | 207 KB | 34% | €7/mo | Costly |
Unattributable Unattributable | Other | 485ms | 0 KB | — | €5/mo | Costly |
www.coca-cola.com www.coca-cola.com | Other | 483ms | 23 KB | — | €5/mo | Costly |
www.coca-cola.com www.coca-cola.com | Other | 433ms | 100 KB | 73% | €5/mo | Costly |
www.coca-cola.com www.coca-cola.com | Other | 279ms | 17 KB | — | €3/mo | Costly |
Google Tag Manager www.googletagmanager.com | Tag Manager | 207ms | 161 KB | 55% | €2/mo | Costly |
www.coca-cola.com www.coca-cola.com | Other | 124ms | 53 KB | 57% | €1/mo | Optional |
www.coca-cola.com www.coca-cola.com | Other | 121ms | 13 KB | — | €1/mo | Optional |
www.coca-cola.com www.coca-cola.com | Other | 72ms | 83 KB | — | €1/mo | Optional |
cdn.global.gcds.coke.com cdn.global.gcds.coke.com | Other | 57ms | 73 KB | 72% | €1/mo | Optional |
These scripts may cost more than they're worth
- www.gstatic.com adds 861ms and costs ~€9/month
- Google Tag Manager adds 643ms and costs ~€7/month
- Unattributable adds 485ms and costs ~€5/month
- www.coca-cola.com adds 483ms and costs ~€5/month
- www.coca-cola.com adds 433ms and costs ~€5/month
- www.coca-cola.com adds 279ms and costs ~€3/month
- Google Tag Manager adds 207ms and costs ~€2/month
100% of JavaScript execution time is spent on third-party scripts. Consider auditing which scripts are essential.
When third-party JS execution time exceeds your own, performance gains from frontend work are capped by code you don't own.
Learn more ▾ ▴
Every millisecond of third-party JS competes with your own for main-thread time. If their share is bigger than yours, optimization on your code base barely moves the needle. Audit, defer, or remove third-parties before further frontend optimization. Use Lighthouse's third-party audit to identify the worst offenders.
Source: web.dev
www.gstatic.com takes 861ms of CPU time. Consider loading it asynchronously or replacing it with a lighter alternative.
This script has high main-thread execution time — optimize hot paths or defer.
Source: web.dev
Google Tag Manager takes 643ms of CPU time. Consider loading it asynchronously or replacing it with a lighter alternative.
This script has high main-thread execution time — optimize hot paths or defer.
Source: web.dev
Unattributable takes 485ms of CPU time. Consider loading it asynchronously or replacing it with a lighter alternative.
This script has high main-thread execution time — optimize hot paths or defer.
Source: web.dev
www.coca-cola.com takes 483ms of CPU time. Consider loading it asynchronously or replacing it with a lighter alternative.
This script has high main-thread execution time — optimize hot paths or defer.
Source: web.dev
www.coca-cola.com takes 433ms of CPU time. Consider loading it asynchronously or replacing it with a lighter alternative.
This script has high main-thread execution time — optimize hot paths or defer.
Source: web.dev
73% of www.coca-cola.com's code is unused. The script may be loading features you don't use.
Bundle has high unused-code ratio — tree-shaking and route-splitting recover the wasted bytes.
Source: web.dev
www.coca-cola.com takes 279ms of CPU time. Consider loading it asynchronously or replacing it with a lighter alternative.
This script has high main-thread execution time — optimize hot paths or defer.
Source: web.dev
Google Tag Manager takes 207ms of CPU time. Consider loading it asynchronously or replacing it with a lighter alternative.
This script has high main-thread execution time — optimize hot paths or defer.
Source: web.dev
55% of Google Tag Manager's code is unused. The script may be loading features you don't use.
Bundle has high unused-code ratio — tree-shaking and route-splitting recover the wasted bytes.
Source: web.dev
57% of www.coca-cola.com's code is unused. The script may be loading features you don't use.
Bundle has high unused-code ratio — tree-shaking and route-splitting recover the wasted bytes.
Source: web.dev
72% of cdn.global.gcds.coke.com's code is unused. The script may be loading features you don't use.
Bundle has high unused-code ratio — tree-shaking and route-splitting recover the wasted bytes.
Source: web.dev