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.
8.04 s
Largest Contentful Paint Largest Contentful Paint — how long until the largest visible element loads. Under 2.5s is good.
40.59 s
Total Blocking Time Total Blocking Time — total time the main thread was blocked, preventing user input. Under 200ms is good.
18.30 s
Cumulative Layout Shift Cumulative Layout Shift — measures visual stability. How much the page layout shifts during loading. Under 0.1 is good.
0.316
Speed Index Speed Index — how quickly content is visually displayed during load. Under 3.4s is good.
19.39 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.
80.64 s
Page Load Progression
FPage Weight BudgetAction15.3 MB transferred, 313 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
Convert images to WebP/AVIF and resize to display dimensions to reduce transfer size.
Image bandwidth is high — modern formats (WebP/AVIF) and resizing typically cut it 50%+.
Source: web.dev
Subset fonts to include only used characters, or switch to system font stacks.
Font payload is large — subset to used glyphs only, or fall back to system fonts (zero load time).
Source: web.dev font loading
Remove unused CSS rules with tools like PurgeCSS to reduce stylesheet size.
CSS bundle is large — purge unused styles (PurgeCSS, Tailwind JIT) to reduce CSS payload.
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
DThird-Party ImpactAction100% third-party, 0 ms blockingFIX
FJS Execution CostAction41027ms total JS executionFIX
Main Thread Breakdown
| Script | Total | Scripting | Parse/Compile | Party |
|---|---|---|---|---|
| https://www.amtrak.com/etc/designs/tickets/angular/polyfills.1774901406977.js | 6768ms | 6466ms | 33ms | 3rd |
| https://www.amtrak.com/etc/designs/tickets/angular/main.1774901406977.js | 5874ms | 5109ms | 559ms | 3rd |
| https://www.amtrak.com/assets/67113e0702755c12751663992ad078f3e02f0df9ed7 | 3282ms | 3047ms | 44ms | 3rd |
| https://www.amtrak.com/etc.clientlibs/dotcom/components/core/clientlibs/clientlib-base.1774901406977.js | 3111ms | 1896ms | 632ms | 3rd |
| Unattributable | 3050ms | 589ms | 0ms | 3rd |
| https://www.amtrak.com/home | 2091ms | 86ms | 14ms | 3rd |
| https://www.amtrak.com/-1Udco/FFihU/-gCLi/rQrV/7mOmQkr4GrzrGD/Yy41AxIr/HGB/LCkBwWRUB | 1117ms | 941ms | 90ms | 3rd |
| https://assets.adobedtm.com/da9e17b55e5c/c18507490ba5/32cc4cedcbf0/RC41940fd421d646f888d83db9d6b88450-source.min.js | 988ms | 850ms | 1ms | 3rd |
| https://www.redditstatic.com/ads/pixel.js | 977ms | 942ms | 11ms | 3rd |
| https://cdn.cookielaw.org/scripttemplates/202410.1.0/otBannerSdk.js | 846ms | 556ms | 101ms | 3rd |
Showing top 10 of 58 scripts
FJS BundlesAction110 scripts, 3.4 MB unusedFIX
Downloaded but never executed on this page.
| Script | Size | Unused | Minified | Party |
|---|---|---|---|---|
| https://www.amtrak.com/etc.clientlibs/dotcom/components/core/clientlibs/clientlib-base.1774901406977.js | 880 KB | 583 KB (67%) | ✗ | 3rd |
| https://www.amtrak.com/etc/designs/tickets/angular/main.1774901406977.js | 750 KB | 461 KB (61%) | ✓ | 3rd |
| https://www.amtrak.com/etc/designs/tickets/angular/vendor.1774901406977.js | 587 KB | 185 KB (31%) | ✓ | 3rd |
| https://www.gstatic.com/recaptcha/releases/gTpTIWhbKpxADzTzkcabhXN4/recaptcha__en.js | 0 KB | 110 KB (49%) | ✓ | 3rd |
| https://www.gstatic.com/recaptcha/releases/gTpTIWhbKpxADzTzkcabhXN4/recaptcha__en.js | 362 KB | 110 KB (49%) | ✓ | 3rd |
| https://www.gstatic.com/recaptcha/releases/gTpTIWhbKpxADzTzkcabhXN4/recaptcha__en.js | 362 KB | 110 KB (49%) | ✓ | 3rd |
| https://www.amtrak.com/etc.clientlibs/amtrak-b2c/components/core/clientlib-base.1774901406977.js | 173 KB | 106 KB (62%) | ✗ | 3rd |
| https://www.googletagmanager.com/gtag/js?id=AW-939791797 | 146 KB | 106 KB (73%) | ✓ | 3rd |
| https://www.amtrak.com/etc.clientlibs/clientlibs/granite/jquery-ui.js | 126 KB | 106 KB (84%) | ✗ | 3rd |
| https://www.googletagmanager.com/gtag/js?id=AW-750086794&cx=c>m=4e64h1 | 134 KB | 61 KB (46%) | ✓ | 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 InventoryAction313 resources · 15.3 MB · 3.4 MB savings availableFIX
~3.4 MiB of savings available
| # | Resource | Type | Size | Cache | Unused | 3rd party | Issues |
|---|---|---|---|---|---|---|---|
| — | — | ||||||
| 313 resources | 15.3 MiB | ||||||
FHTTP CachingActionNo cache headersFIX
No Cache-Control header
Adding a Cache-Control header can significantly improve repeat-visit performance.
CImage OptimizationAction71 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
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 Loading7 fonts (417 KB)PASS
Web fonts
7
417 KB total
Render-blocking
0
of 7
Dominant font-display
swap
Most common across fonts
Font loading timeline
- Convert to woff2 for ~30% smaller file size
- Convert to woff2 for ~30% smaller file size
- Convert to woff2 for ~30% smaller file size
- Convert to woff2 for ~30% smaller file size
- 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 ~102 KB and ~204 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 Waterfall313 requests over 10469msINFO
Third-Party Script CostPer-script blocking time, transfer cost, and cache headersINFO
| Script | Category | Execution | Transfer | Unused | Monthly Cost | Verdict |
|---|---|---|---|---|---|---|
www.amtrak.com www.amtrak.com | Other | 6768ms | 40 KB | 66% | $90/mo | Costly |
www.amtrak.com www.amtrak.com | Other | 5874ms | 750 KB | 61% | $78/mo | Costly |
www.amtrak.com www.amtrak.com | Other | 3282ms | 62 KB | 34% | $44/mo | Costly |
www.amtrak.com www.amtrak.com | Other | 3111ms | 880 KB | 67% | $41/mo | Costly |
Unattributable Unattributable | Other | 3050ms | 0 KB | — | $40/mo | Costly |
www.amtrak.com www.amtrak.com | Other | 2091ms | 46 KB | — | $28/mo | Costly |
www.amtrak.com www.amtrak.com | Other | 1117ms | 0 KB | 19% | $15/mo | Costly |
assets.adobedtm.com assets.adobedtm.com | Other | 988ms | 1 KB | — | $13/mo | Costly |
www.redditstatic.com www.redditstatic.com | Other | 977ms | 19 KB | — | $13/mo | Costly |
OneTrust cdn.cookielaw.org | Consent | 846ms | 112 KB | 53% | $11/mo | Essential |
assets.adobedtm.com assets.adobedtm.com | Other | 843ms | 180 KB | 34% | $11/mo | Costly |
www.amtrak.com www.amtrak.com | Other | 827ms | 155 KB | 18% | $11/mo | Costly |
www.gstatic.com www.gstatic.com | Other | 746ms | 0 KB | 49% | $10/mo | Costly |
Facebook Pixel connect.facebook.net | Advertising | 446ms | 45 KB | — | $6/mo | Costly |
app.link app.link | Other | 413ms | 1 KB | — | $5/mo | Costly |
www.amtrak.com www.amtrak.com | Other | 410ms | 587 KB | 31% | $5/mo | Costly |
Google Tag Manager www.googletagmanager.com | Tag Manager | 397ms | 130 KB | 41% | $5/mo | Costly |
www.amtrak.com www.amtrak.com | Other | 391ms | 9 KB | — | $5/mo | Costly |
assets.adobedtm.com assets.adobedtm.com | Other | 324ms | 2 KB | — | $4/mo | Costly |
www.amtrak.com www.amtrak.com | Other | 321ms | 87 KB | 48% | $4/mo | Costly |
Google Tag Manager www.googletagmanager.com | Tag Manager | 306ms | 147 KB | 37% | $4/mo | Costly |
Google Tag Manager www.googletagmanager.com | Tag Manager | 305ms | 146 KB | 40% | $4/mo | Costly |
Facebook Pixel connect.facebook.net | Advertising | 305ms | 97 KB | 35% | $4/mo | Costly |
Google Tag Manager www.googletagmanager.com | Tag Manager | 303ms | 145 KB | 40% | $4/mo | Costly |
www.amtrak.com www.amtrak.com | Other | 296ms | 34 KB | 59% | $4/mo | Costly |
Google Tag Manager www.googletagmanager.com | Tag Manager | 285ms | 137 KB | 44% | $4/mo | Costly |
Google Tag Manager www.googletagmanager.com | Tag Manager | 267ms | 131 KB | 42% | $4/mo | Costly |
Google Tag Manager www.googletagmanager.com | Tag Manager | 266ms | 137 KB | 44% | $4/mo | Costly |
Google Tag Manager www.googletagmanager.com | Tag Manager | 264ms | 137 KB | 44% | $4/mo | Costly |
Google Tag Manager www.googletagmanager.com | Tag Manager | 260ms | 130 KB | 47% | $3/mo | Costly |
Google Tag Manager www.googletagmanager.com | Tag Manager | 259ms | 130 KB | 44% | $3/mo | Costly |
Google Tag Manager www.googletagmanager.com | Tag Manager | 258ms | 130 KB | 44% | $3/mo | Costly |
Google Tag Manager www.googletagmanager.com | Tag Manager | 257ms | 130 KB | 44% | $3/mo | Costly |
Google Tag Manager www.googletagmanager.com | Tag Manager | 256ms | 130 KB | 44% | $3/mo | Costly |
Google Tag Manager www.googletagmanager.com | Tag Manager | 256ms | 136 KB | 44% | $3/mo | Costly |
www.amtrak.com www.amtrak.com | Other | 243ms | 173 KB | 62% | $3/mo | Costly |
Google Tag Manager www.googletagmanager.com | Tag Manager | 239ms | 134 KB | 46% | $3/mo | Costly |
Google Tag Manager www.googletagmanager.com | Tag Manager | 235ms | 134 KB | 46% | $3/mo | Costly |
Google Tag Manager www.googletagmanager.com | Tag Manager | 228ms | 134 KB | 46% | $3/mo | Costly |
Google Tag Manager www.googletagmanager.com | Tag Manager | 227ms | 134 KB | 46% | $3/mo | Costly |
resources.digital-cloud-west.medallia.com resources.digital-cloud-west.medallia.com | Other | 216ms | 83 KB | 69% | $3/mo | Costly |
s.pinimg.com s.pinimg.com | Other | 214ms | 28 KB | 78% | $3/mo | Costly |
www.amtrak.com www.amtrak.com | Other | 183ms | 126 KB | 84% | $2/mo | Optional |
Google Tag Manager www.googletagmanager.com | Tag Manager | 173ms | 131 KB | 46% | $2/mo | Optional |
Google Tag Manager www.googletagmanager.com | Tag Manager | 168ms | 130 KB | 46% | $2/mo | Optional |
sc-static.net sc-static.net | Other | 165ms | 25 KB | — | $2/mo | Optional |
assets.adobedtm.com assets.adobedtm.com | Other | 164ms | 1 KB | — | $2/mo | Optional |
Google Tag Manager www.googletagmanager.com | Tag Manager | 161ms | 145 KB | 42% | $2/mo | Optional |
Google Tag Manager www.googletagmanager.com | Tag Manager | 156ms | 146 KB | 73% | $2/mo | Optional |
cdn.decibelinsight.net cdn.decibelinsight.net | Other | 144ms | 64 KB | — | $2/mo | Optional |
www.amtrak.com www.amtrak.com | Other | 129ms | 234 KB | — | $2/mo | Optional |
assets.adobedtm.com assets.adobedtm.com | Other | 128ms | 1 KB | — | $2/mo | Optional |
64854_1825202523.js 64854_1825202523.js | Other | 115ms | 0 KB | — | $2/mo | Optional |
www.amtrak.com www.amtrak.com | Other | 81ms | 32 KB | — | $1/mo | Optional |
Twitter/X Pixel static.ads-twitter.com | Advertising | 81ms | 13 KB | — | $1/mo | Optional |
OneTrust cdn.cookielaw.org | Consent | 77ms | 9 KB | — | $1/mo | Essential |
www.amtrak.com www.amtrak.com | Other | 71ms | 18 KB | — | $1/mo | Optional |
assets.adobedtm.com assets.adobedtm.com | Other | 66ms | 1 KB | — | $1/mo | Optional |
These scripts may cost more than they're worth
- www.amtrak.com adds 6768ms and costs ~$90/month
- www.amtrak.com adds 5874ms and costs ~$78/month
- www.amtrak.com adds 3282ms and costs ~$44/month
- www.amtrak.com adds 3111ms and costs ~$41/month
- Unattributable adds 3050ms and costs ~$40/month
- www.amtrak.com adds 2091ms and costs ~$28/month
- www.amtrak.com adds 1117ms and costs ~$15/month
- assets.adobedtm.com adds 988ms and costs ~$13/month
- www.redditstatic.com adds 977ms and costs ~$13/month
- assets.adobedtm.com adds 843ms and costs ~$11/month
- www.amtrak.com adds 827ms and costs ~$11/month
- www.gstatic.com adds 746ms and costs ~$10/month
- Facebook Pixel adds 446ms and costs ~$6/month
- app.link adds 413ms and costs ~$5/month
- www.amtrak.com adds 410ms and costs ~$5/month
- Google Tag Manager adds 397ms and costs ~$5/month
- www.amtrak.com adds 391ms and costs ~$5/month
- assets.adobedtm.com adds 324ms and costs ~$4/month
- www.amtrak.com adds 321ms and costs ~$4/month
- Google Tag Manager adds 306ms and costs ~$4/month
- Google Tag Manager adds 305ms and costs ~$4/month
- Facebook Pixel adds 305ms and costs ~$4/month
- Google Tag Manager adds 303ms and costs ~$4/month
- www.amtrak.com adds 296ms and costs ~$4/month
- Google Tag Manager adds 285ms and costs ~$4/month
- Google Tag Manager adds 267ms and costs ~$4/month
- Google Tag Manager adds 266ms and costs ~$4/month
- Google Tag Manager adds 264ms and costs ~$4/month
- Google Tag Manager adds 260ms and costs ~$3/month
- Google Tag Manager adds 259ms and costs ~$3/month
- Google Tag Manager adds 258ms and costs ~$3/month
- Google Tag Manager adds 257ms and costs ~$3/month
- Google Tag Manager adds 256ms and costs ~$3/month
- Google Tag Manager adds 256ms and costs ~$3/month
- www.amtrak.com adds 243ms and costs ~$3/month
- Google Tag Manager adds 239ms and costs ~$3/month
- Google Tag Manager adds 235ms and costs ~$3/month
- Google Tag Manager adds 228ms and costs ~$3/month
- Google Tag Manager adds 227ms and costs ~$3/month
- resources.digital-cloud-west.medallia.com adds 216ms and costs ~$3/month
- s.pinimg.com adds 214ms 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.amtrak.com takes 6768ms 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
66% of www.amtrak.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.amtrak.com takes 5874ms 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 www.amtrak.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.amtrak.com takes 3282ms 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.amtrak.com takes 3111ms 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
67% of www.amtrak.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
Unattributable takes 3050ms 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.amtrak.com takes 2091ms 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.amtrak.com takes 1117ms 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
assets.adobedtm.com takes 988ms 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.redditstatic.com takes 977ms 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
53% 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
assets.adobedtm.com takes 843ms 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.amtrak.com takes 827ms 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.gstatic.com takes 746ms 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
Facebook Pixel takes 446ms 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
app.link takes 413ms 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.amtrak.com takes 410ms 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 397ms 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.amtrak.com takes 391ms 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
assets.adobedtm.com takes 324ms 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.amtrak.com takes 321ms 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 306ms 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 305ms 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
Facebook Pixel takes 305ms 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 303ms 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.amtrak.com takes 296ms 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
59% of www.amtrak.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 285ms 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 267ms 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 266ms 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 264ms 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 260ms 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 259ms 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 258ms 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 257ms 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 256ms 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 256ms 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.amtrak.com takes 243ms 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
62% of www.amtrak.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 239ms 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 235ms 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 228ms 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 227ms 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
resources.digital-cloud-west.medallia.com takes 216ms 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
69% of resources.digital-cloud-west.medallia.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
s.pinimg.com takes 214ms 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
78% of s.pinimg.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
84% of www.amtrak.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
73% 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