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.
7.23 s
Largest Contentful Paint Largest Contentful Paint — how long until the largest visible element loads. Under 2.5s is good.
17.78 s
Total Blocking Time Total Blocking Time — total time the main thread was blocked, preventing user input. Under 200ms is good.
1.49 s
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.
8.34 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.
17.97 s
Page Load Progression
DThird-Party ImpactAction63% third-party, 0 ms blockingFIX
FJS Execution CostAction5905ms total JS executionFIX
Main Thread Breakdown
| Script | Total | Scripting | Parse/Compile | Party |
|---|---|---|---|---|
| Unattributable | 1081ms | 301ms | 0ms | 3rd |
| https://s.lngtdv.com/prebid/serverfault/prebid10.29.0.1776283749.min.js | 751ms | 616ms | 54ms | 3rd |
| https://serverfault.com/ | 646ms | 81ms | 19ms | 1st |
| https://pagead2.googlesyndication.com/pagead/managed/js/gpt/m202604160201/pubads_impl.js | 608ms | 518ms | 77ms | 3rd |
| https://cdn.cookielaw.org/consent/b7645c37-9f82-4dfb-b719-2b5d032b2a75/OtAutoBlock.js | 558ms | 351ms | 202ms | 3rd |
| https://serverfault.com/cdn-cgi/challenge-platform/scripts/jsd/main.js | 328ms | 301ms | 4ms | 1st |
| https://www.googletagmanager.com/gtag/js?id=G-S812YQPLT2 | 328ms | 260ms | 59ms | 3rd |
| https://cdn.cookielaw.org/scripttemplates/202602.1.0/otBannerSdk.js | 257ms | 112ms | 70ms | 3rd |
| https://s.lngtdv.com/serverfault/default.1776784667.js | 183ms | 137ms | 40ms | 3rd |
| https://serverfault.com/Content/Js/islands/signup-modal.en.js?v=f64ec881ea96 | 179ms | 154ms | 3ms | 1st |
Showing top 10 of 20 scripts
FJS BundlesAction31 scripts, 627 KB unusedFIX
Downloaded but never executed on this page.
| Script | Size | Unused | Minified | Party |
|---|---|---|---|---|
| https://pagead2.googlesyndication.com/pagead/managed/js/gpt/m202604160201/pubads_impl.js | 188 KB | 106 KB (56%) | ✓ | 3rd |
| https://serverfault.com/Content/Js/full-anon.en.js?v=037e97b07fca | 129 KB | 94 KB (73%) | ✓ | 1st |
| https://cdn.cookielaw.org/scripttemplates/202602.1.0/otBannerSdk.js | 129 KB | 78 KB (61%) | ✓ | 3rd |
| https://s.lngtdv.com/prebid/serverfault/prebid10.29.0.1776283749.min.js | 162 KB | 75 KB (47%) | ✓ | 3rd |
| https://accounts.google.com/gsi/client | 96 KB | 72 KB (75%) | ✓ | 3rd |
| https://www.googletagmanager.com/gtag/js?id=G-S812YQPLT2 | 0 KB | 62 KB (40%) | ✓ | 3rd |
| https://www.googletagmanager.com/gtag/js?id=G-S812YQPLT2 | 154 KB | 62 KB (40%) | ✓ | 3rd |
| https://serverfault.com/Content/Js/webpack-chunks/svelte.en.js?v=f773033c4e0b | 32 KB | 32 KB (99%) | ✓ | 1st |
| https://s.lngtdv.com/serverfault/default.1776784667.js | 71 KB | 25 KB (35%) | ✓ | 3rd |
| https://serverfault.com/Content/Js/third-party/npm/@stackoverflow/stacks/dist/js/stacks.min.js?v=c7bcc7a1b4fd | 30 KB | 20 KB (67%) | ✓ | 1st |
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 InventoryAction99 resources · 2.0 MB · 627 KB savings availableFIX
~626.6 KiB of savings available
| # | Resource | Type | Size | Cache | Unused | 3rd party | Issues |
|---|---|---|---|---|---|---|---|
| — | — | ||||||
| 99 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, 99 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
BImage Optimization18 images, 0 KB saveableREVIEW
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
A+Text CompressionAll text resources are compressedPASS
A+Font LoadingNo web fonts (system fonts)PASS
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
A+Green HostingWhether the site is served from green-energy infrastructurePASS
Green Hosting
This site is hosted on green energy infrastructure
Provider: Cloudflare
Network Waterfall99 requests over 3288msINFO
Third-Party Script CostPer-script blocking time, transfer cost, and cache headersINFO
| Script | Category | Execution | Transfer | Unused | Monthly Cost | Verdict |
|---|---|---|---|---|---|---|
Unattributable Unattributable | Other | 1081ms | 0 KB | — | $14/mo | Costly |
s.lngtdv.com s.lngtdv.com | Other | 751ms | 162 KB | 47% | $10/mo | Costly |
pagead2.googlesyndication.com pagead2.googlesyndication.com | Other | 608ms | 188 KB | 56% | $8/mo | Costly |
OneTrust cdn.cookielaw.org | Consent | 558ms | 156 KB | — | $7/mo | Essential |
Google Tag Manager www.googletagmanager.com | Tag Manager | 328ms | 0 KB | 40% | $4/mo | Costly |
OneTrust cdn.cookielaw.org | Consent | 257ms | 129 KB | 61% | $3/mo | Essential |
s.lngtdv.com s.lngtdv.com | Other | 183ms | 71 KB | 35% | $2/mo | Optional |
pagead2.googlesyndication.com pagead2.googlesyndication.com | Other | 119ms | 34 KB | — | $2/mo | Optional |
ajax.googleapis.com ajax.googleapis.com | Other | 109ms | 30 KB | — | $1/mo | Optional |
cdn.id5-sync.com cdn.id5-sync.com | Other | 93ms | 30 KB | — | $1/mo | Optional |
accounts.google.com accounts.google.com | Other | 79ms | 96 KB | 75% | $1/mo | Optional |
OneTrust cdn.cookielaw.org | Consent | 65ms | 9 KB | — | $1/mo | Essential |
ep2.adtrafficquality.google ep2.adtrafficquality.google | Other | 64ms | 8 KB | — | $1/mo | Optional |
These scripts may cost more than they're worth
- Unattributable adds 1081ms and costs ~$14/month
- s.lngtdv.com adds 751ms and costs ~$10/month
- pagead2.googlesyndication.com adds 608ms and costs ~$8/month
- Google Tag Manager adds 328ms and costs ~$4/month
73% 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
Unattributable takes 1081ms 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
s.lngtdv.com takes 751ms 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
pagead2.googlesyndication.com takes 608ms 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
56% of pagead2.googlesyndication.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
Google Tag Manager takes 328ms 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
61% of OneTrust'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
75% of accounts.google.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