Performance
· 15 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.
574 ms
Largest Contentful Paint Largest Contentful Paint — how long until the largest visible element loads. Under 2.5s is good.
1.26 s
Total Blocking Time Total Blocking Time — total time the main thread was blocked, preventing user input. Under 200ms is good.
0 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.
1.14 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.
1.26 s
Page Load Progression
DThird-Party ImpactAction100% third-party, 0 ms blockingFIX
DPage Weight InventoryAction112 resources · 2.0 MB · 280 KB savings availableFIX
~280.2 KiB of savings available
| # | Resource | Type | Size | Cache | Unused | 3rd party | Issues |
|---|---|---|---|---|---|---|---|
| — | — | ||||||
| 112 resources | 2.0 MiB | ||||||
FHTTP CachingActionNo cache headersFIX
No Cache-Control header
Adding a Cache-Control header can significantly improve repeat-visit performance.
CPage Weight BudgetAction2.0 MB transferred, 112 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
Each request adds latency. Bundle small files, use sprites, or eliminate unnecessary requests.
High HTTP request count — bundling, sprite-ing, and HTTP/2 server push can reduce per-request overhead.
Source: web.dev
BImage Optimization40 images, 0 KB saveableREVIEW
CJS Execution CostAction1252ms total JS executionREVIEW
Main Thread Breakdown
| Script | Total | Scripting | Parse/Compile | Party |
|---|---|---|---|---|
| https://static-cdn.spot.im/production/social/tags/v5.26.0/launcher/691-bundle.js | 520ms | 452ms | 7ms | 3rd |
| https://www.jalopnik.com/ | 174ms | 6ms | 1ms | 3rd |
| https://static-cdn.spot.im/production/social/tags/v5.26.0/launcher/696-bundle.js | 160ms | 19ms | 0ms | 3rd |
| Unattributable | 151ms | 17ms | 0ms | 3rd |
| https://eu-us-cdn.consentmanager.net/delivery/customdata/bV8xLndfMTM0MzQ5LnJfR0RQUi5sX2VuLmRfNTIzNDIueF80Mi52LnAudF81MjM0Mi54dF8yNTc2.js | 65ms | 53ms | 2ms | 3rd |
| https://www.googletagmanager.com/gtag/js?id=G-DX2L97ME2L | 64ms | 54ms | 10ms | 3rd |
| https://static-cdn.spot.im/production/social/tags/v5.26.0/launcher/entry-bundle.js | 62ms | 58ms | 1ms | 3rd |
| https://scripts.mediavine.com/tags/3.44.10-iiqNewBrowsers/wrapper.min.js?bust=-1713469737 | 56ms | 39ms | 14ms | 3rd |
CJS BundlesAction41 scripts, 280 KB unusedREVIEW
Downloaded but never executed on this page.
| Script | Size | Unused | Minified | Party |
|---|---|---|---|---|
| https://www.googletagmanager.com/gtag/js?id=G-DX2L97ME2L | 160 KB | 62 KB (39%) | ✓ | 3rd |
| https://static-cdn.spot.im/production/social/tags/v5.26.0/launcher/691-bundle.js | 101 KB | 54 KB (54%) | ✓ | 3rd |
| https://scripts.mediavine.com/tags/3.44.10-iiqNewBrowsers/wrapper.min.js?bust=-1713469737 | 78 KB | 40 KB (52%) | ✓ | 3rd |
| https://static-cdn.spot.im/production/social/tags/v5.26.0/launcher/296-bundle.js | 55 KB | 37 KB (69%) | ✓ | 3rd |
| https://eu-us-cdn.consentmanager.net/delivery/js/cmp_final.min.js?t=2026-4-21 | 101 KB | 35 KB (35%) | ✓ | 3rd |
| https://sdk.mrf.io/statics/marfeel-sdk.js?id=3544 | 58 KB | 30 KB (51%) | ✓ | 3rd |
| https://static-cdn.spot.im/production/social/tags/v5.26.0/launcher/467-bundle.js | 30 KB | 22 KB (73%) | ✓ | 3rd |
| https://eu-us.consentmanager.net/delivery/cmp.php?__cmpcc=2&__cmpfcc=1&id=134349&o=1776815568&h=https%3A%2F%2Fwww.jalopnik.com%2F&&cmpsetcc=FR-NONE&l=en&odw=0&dlt=1&l=en&lp=EN-US&cmpsetcc=FR-NONE | 3 KB | — | ✓ | 3rd |
| https://static-cdn.spot.im/production/social/tags/v5.26.0/launcher/696-bundle.js | 7 KB | — | ✓ | 3rd |
| https://launcher.spot.im/spot/sp_7mUJW9YQ | 19 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
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 Loading3 fonts (49 KB)PASS
Web fonts
3
49 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 HintsNo optimization neededPASS
Network Waterfall112 requests over 2604msINFO
Third-Party Script CostPer-script blocking time, transfer cost, and cache headersINFO
| Script | Category | Execution | Transfer | Unused | Monthly Cost | Verdict |
|---|---|---|---|---|---|---|
static-cdn.spot.im static-cdn.spot.im | Other | 520ms | 101 KB | 54% | $9/mo | Costly |
www.jalopnik.com www.jalopnik.com | Other | 174ms | 21 KB | — | $3/mo | Optional |
static-cdn.spot.im static-cdn.spot.im | Other | 160ms | 7 KB | — | $3/mo | Optional |
Unattributable Unattributable | Other | 151ms | 0 KB | — | $3/mo | Optional |
eu-us-cdn.consentmanager.net eu-us-cdn.consentmanager.net | Other | 65ms | 26 KB | — | $1/mo | Optional |
Google Tag Manager www.googletagmanager.com | Tag Manager | 64ms | 160 KB | 39% | $1/mo | Optional |
static-cdn.spot.im static-cdn.spot.im | Other | 62ms | 15 KB | — | $1/mo | Optional |
scripts.mediavine.com scripts.mediavine.com | Other | 56ms | 78 KB | 52% | $1/mo | Optional |
These scripts may cost more than they're worth
- static-cdn.spot.im adds 520ms and costs ~$9/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
static-cdn.spot.im takes 520ms 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
54% of static-cdn.spot.im'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
52% of scripts.mediavine.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