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.
1.81 s
Largest Contentful Paint Largest Contentful Paint — how long until the largest visible element loads. Under 2.5s is good.
8.01 s
Total Blocking Time Total Blocking Time — total time the main thread was blocked, preventing user input. Under 200ms is good.
581 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.
3.42 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.
8.01 s
Page Load Progression
375 ms 750 ms 1.1 s
1.5 s
1.9 s 2.2 s 2.6 s 3.0 sDThird-Party ImpactAction84% third-party, 0 ms blockingFIX
DHTTP CachingActionno-store (uncacheable)FIX
no-store, must-revalidate
| Directive | Value | Meaning |
|---|---|---|
| no-store | — | Never cache this response |
| must-revalidate | — | Must recheck with server after expiry |
CJS Execution CostAction1360ms total JS executionREVIEW
Main Thread Breakdown
| Script | Total | Scripting | Parse/Compile | Party |
|---|---|---|---|---|
| https://www.googletagmanager.com/gtag/js?id=G-TB9LD0R9B6&cx=c>m=4e64h1 | 508ms | 380ms | 65ms | 3rd |
| Unattributable | 469ms | 8ms | 0ms | 3rd |
| https://www.googletagmanager.com/gtm.js?id=GTM-TN5D87V | 312ms | 255ms | 55ms | 3rd |
| https://aad.org/ | 71ms | 12ms | 3ms | 1st |
BJS Bundles5 scripts, 120 KB unusedREVIEW
Downloaded but never executed on this page.
| Script | Size | Unused | Minified | Party |
|---|---|---|---|---|
| https://www.googletagmanager.com/gtm.js?id=GTM-TN5D87V | 149 KB | 64 KB (43%) | ✓ | 3rd |
| https://www.googletagmanager.com/gtag/js?id=G-TB9LD0R9B6&cx=c>m=4e64h1 | 171 KB | 56 KB (33%) | ✓ | 3rd |
| https://assets.aad.org/js/RegModal.js?am2026.1 | 1 KB | — | ✓ | 3rd |
| https://assets.aad.org/js/main.js?cb=20191115 | 11 KB | — | ✗ | 3rd |
| https://googleads.g.doubleclick.net/pagead/viewthroughconversion/11481519194/?random=1776813135554&cv=11&fst=1776813135554&bg=ffffff&guid=ON&async=1&en=gtag.config>m=45je64h1v888719910z89123674680za20gzb9123674680zd9123674680xec&gcd=13l3l3l3l1l1&dma=0&tag_exp=0~115938465~115938468~117266400~117512542&u_w=412&u_h=823&url=https%3A%2F%2Faad.org%2F&rcb=17&frm=0&tiba=American%20Academy%20of%20Dermatology&hn=www.googleadservices.com&npa=0&pscdl=noapi&auid=1979208099.1776813135&uaa=&uab=64&uafvl=Not-A.Brand%3B24.0.0.0%7CChromium%3B146.0.7680.164&uamb=1&uam=moto%20g%20power%20(2022)&uap=Android&uapv=11.0&uaw=0&data=event%3Dgtag.config&rfmt=3&fmt=4 | 2 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
CGreen HostingActionWhether the site is served from green-energy infrastructureREVIEW
Green Hosting
No green hosting detected
APage Weight Budget851 KB transferred, 19 requestsPASS
A+Text CompressionAll text resources are compressedPASS
AImage Optimization4 images, 0 KB saveablePASS
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
APage Weight Inventory19 resources · 851 KB · 120 KB savings availablePASS
~119.9 KiB of savings available
| # | Resource | Type | Size | Cache | Unused | 3rd party | Issues |
|---|---|---|---|---|---|---|---|
| — | — | ||||||
| 19 resources | 851.5 KiB | ||||||
A+Render-Blocking ResourcesNo render-blocking resources detectedPASS
A+Third-Party ResourcesNo third-party resources detectedPASS
Network Waterfall19 requests over 679msINFO
Third-Party Script CostPer-script blocking time, transfer cost, and cache headersINFO
| Script | Category | Execution | Transfer | Unused | Monthly Cost | Verdict |
|---|---|---|---|---|---|---|
Google Tag Manager www.googletagmanager.com | Tag Manager | 508ms | 171 KB | 33% | $7/mo | Costly |
Unattributable Unattributable | Other | 469ms | 0 KB | — | $6/mo | Costly |
Google Tag Manager www.googletagmanager.com | Tag Manager | 312ms | 149 KB | 43% | $4/mo | Costly |
These scripts may cost more than they're worth
- Google Tag Manager adds 508ms and costs ~$7/month
- Unattributable adds 469ms and costs ~$6/month
- Google Tag Manager adds 312ms and costs ~$4/month
95% 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
Google Tag Manager takes 508ms 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 469ms 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 312ms 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