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.
3.51 s
Largest Contentful Paint Largest Contentful Paint — how long until the largest visible element loads. Under 2.5s is good.
5.01 s
Total Blocking Time Total Blocking Time — total time the main thread was blocked, preventing user input. Under 200ms is good.
187 ms
Cumulative Layout Shift Cumulative Layout Shift — measures visual stability. How much the page layout shifts during loading. Under 0.1 is good.
0.000
Speed Index Speed Index — how quickly content is visually displayed during load. Under 3.4s is good.
3.51 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.
7.70 s
Page Load Progression
DThird-Party ImpactAction100% third-party, 0 ms blockingFIX
DJS Execution CostAction2661ms total JS executionFIX
Main Thread Breakdown
| Script | Total | Scripting | Parse/Compile | Party |
|---|---|---|---|---|
| https://www.univision.com/ | 1138ms | 180ms | 150ms | 3rd |
| https://www.univision.com/_next/static/chunks/e411b54cb40b88f8.js | 681ms | 617ms | 15ms | 3rd |
| Unattributable | 403ms | 20ms | 0ms | 3rd |
| https://www.googletagmanager.com/gtm.js?id=GTM-TDVV9BR | 254ms | 138ms | 45ms | 3rd |
| https://www.univision.com/_next/static/chunks/f66e73477f7b75d1.js | 185ms | 141ms | 7ms | 3rd |
DPage Weight InventoryAction84 resources · 1.9 MB · 193 KB savings availableFIX
~192.9 KiB of savings available
| # | Resource | Type | Size | Cache | Unused | 3rd party | Issues |
|---|---|---|---|---|---|---|---|
| — | — | ||||||
| 84 resources | 1.9 MiB | ||||||
CPage Weight BudgetAction1.9 MB transferred, 84 requestsREVIEW
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
CJS BundlesAction34 scripts, 193 KB unusedREVIEW
Downloaded but never executed on this page.
| Script | Size | Unused | Minified | Party |
|---|---|---|---|---|
| https://www.googletagmanager.com/gtm.js?id=GTM-TDVV9BR | 173 KB | 78 KB (45%) | ✓ | 3rd |
| https://www.univision.com/_next/static/chunks/13e106ad54dd5156.js | 54 KB | 42 KB (78%) | ✓ | 3rd |
| https://www.univision.com/_next/static/chunks/eaf56f1960f9d66e.js | 30 KB | 29 KB (99%) | ✓ | 3rd |
| https://www.univision.com/_next/static/chunks/2f30b84bf5cdd492.js | 30 KB | 24 KB (80%) | ✓ | 3rd |
| https://www.univision.com/_next/static/chunks/d4c8575498c5b558.js | 29 KB | 21 KB (72%) | ✓ | 3rd |
| https://www.univision.com/_next/static/chunks/3346108d583de672.js | 5 KB | — | ✓ | 3rd |
| https://www.univision.com/_next/static/chunks/8f8fe458b1f9d22e.js | 3 KB | — | ✓ | 3rd |
| https://www.univision.com/_next/static/chunks/f66e73477f7b75d1.js | 29 KB | — | ✓ | 3rd |
| https://www.univision.com/_next/static/chunks/turbopack-8536c157bf3aa3a2.js | 4 KB | — | ✓ | 3rd |
| https://www.univision.com/_next/static/chunks/f70b998379950ef2.js | 1 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
BHTTP CachingprivateREVIEW
private
| Directive | Value | Meaning |
|---|---|---|
| private | — | Only browser cache, not CDN/proxy |
A+Text CompressionAll text resources are compressedPASS
AImage Optimization15 images, 0 KB saveablePASS
A+Font Loading3 fonts (72 KB)PASS
Web fonts
3
72 KB total
Render-blocking
0
of 3
Dominant font-display
swap
Most common across fonts
Font loading timeline
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)
A+Resource CachingAll resources properly cachedPASS
A+Critical Rendering PathNo render-blocking resourcesPASS
A+Resource Hints35 hints, 0 missing preconnectsPASS
Current Resource Hints
35 resource hints configured
A+Render-Blocking ResourcesNo render-blocking resources detectedPASS
A+Third-Party ResourcesNo third-party resources detectedPASS
A+Green HostingWhether the site is served from green-energy infrastructurePASS
Green Hosting
This site is hosted on green energy infrastructure
Provider: Google Cloud
Network Waterfall84 requests over 1416msINFO
Third-Party Script CostPer-script blocking time, transfer cost, and cache headersINFO
| Script | Category | Execution | Transfer | Unused | Monthly Cost | Verdict |
|---|---|---|---|---|---|---|
www.univision.com www.univision.com | Other | 1138ms | 245 KB | — | €12/mo | Costly |
www.univision.com www.univision.com | Other | 681ms | 64 KB | — | €7/mo | Costly |
Unattributable Unattributable | Other | 403ms | 0 KB | — | €4/mo | Costly |
Google Tag Manager www.googletagmanager.com | Tag Manager | 254ms | 173 KB | 45% | €3/mo | Costly |
www.univision.com www.univision.com | Other | 185ms | 29 KB | — | €2/mo | Optional |
These scripts may cost more than they're worth
- www.univision.com adds 1138ms and costs ~€12/month
- www.univision.com adds 681ms and costs ~€7/month
- Unattributable adds 403ms and costs ~€4/month
- Google Tag Manager adds 254ms and costs ~€3/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.univision.com takes 1138ms 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.univision.com takes 681ms 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 403ms 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 254ms 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