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.
6.02 s
Largest Contentful Paint Largest Contentful Paint — how long until the largest visible element loads. Under 2.5s is good.
6.65 s
Total Blocking Time Total Blocking Time — total time the main thread was blocked, preventing user input. Under 200ms is good.
867 ms
Cumulative Layout Shift Cumulative Layout Shift — measures visual stability. How much the page layout shifts during loading. Under 0.1 is good.
0.342
Speed Index Speed Index — how quickly content is visually displayed during load. Under 3.4s is good.
10.21 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.
24.93 s
Page Load Progression
FPage Weight BudgetAction3.9 MB transferred, 168 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
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 CostAction6903ms total JS executionFIX
Main Thread Breakdown
| Script | Total | Scripting | Parse/Compile | Party |
|---|---|---|---|---|
| https://www.cdn-net.com/cc.js?sid=7400bfc633aece5a&ts=1776814996056&namespace=advc | 2255ms | 1284ms | 8ms | 3rd |
| Unattributable | 1628ms | 472ms | 0ms | 3rd |
| https://cache.vtrcdn.com/orion/react/client/ebd9cdf8ad449637.chunk.js | 1032ms | 966ms | 1ms | 3rd |
| https://www.viator.com/ | 780ms | 49ms | 6ms | 3rd |
| https://dd.viator.com/tags.js | 250ms | 218ms | 8ms | 3rd |
| https://siteintercept.qualtrics.com/dxjsmodule/12.1a2b7192fd54e87d3971.chunk.js?Q_CLIENTVERSION=2.46.0&Q_CLIENTTYPE=web&Q_BRANDID=www.viator.com | 205ms | 169ms | 11ms | 3rd |
| https://cache.vtrcdn.com/orion/react/client/f30fa5f2393bd5a4.js | 160ms | 126ms | 3ms | 3rd |
| https://beacon.riskified.com/?shop=tripadvisor&sid=6ce8eab9-f21a-48cb-83bd-310a4637ab22 | 138ms | 123ms | 6ms | 3rd |
| https://fbauth.viator.com/__/auth/iframe.js | 119ms | 85ms | 25ms | 3rd |
| https://apis.google.com/_/scs/abc-static/_/js/k=gapi.lb.en.HLcjcliCxoY.O/m=gapi_iframes/rt=j/sv=1/d=1/ed=1/rs=AHpOoo-EKlLcELGvY6Qdg_kTBmN3Ra8MLw/cb=gapi.loaded_0?le=scs | 82ms | 70ms | 11ms | 3rd |
Showing top 10 of 14 scripts
FJS BundlesAction70 scripts, 762 KB unusedFIX
Downloaded but never executed on this page.
| Script | Size | Unused | Minified | Party |
|---|---|---|---|---|
| https://cache.vtrcdn.com/orion/react/client/72fa6320c627611c.chunk.js | 725 KB | 353 KB (49%) | ✓ | 3rd |
| https://cache.vtrcdn.com/orion/react/client/c7c4a925e5123c14.chunk.js | 158 KB | 102 KB (65%) | ✓ | 3rd |
| https://accounts.google.com/gsi/client | 96 KB | 71 KB (75%) | ✓ | 3rd |
| https://fbauth.viator.com/__/auth/iframe.js | 90 KB | 55 KB (61%) | ✓ | 3rd |
| https://cache.vtrcdn.com/orion/react/client/778520d260ee7a97.chunk.js | 50 KB | 32 KB (66%) | ✓ | 3rd |
| https://cache.vtrcdn.com/orion/react/client/ebd9cdf8ad449637.chunk.js | 78 KB | 30 KB (49%) | ✓ | 3rd |
| https://cache.vtrcdn.com/orion/react/client/9387e69ea3756c05.chunk.js | 47 KB | 26 KB (56%) | ✓ | 3rd |
| https://cache.vtrcdn.com/orion/react/client/166993d704b277b8.js | 34 KB | 25 KB (76%) | ✓ | 3rd |
| https://cache.vtrcdn.com/orion/react/client/6992d6c266adc33a.chunk.js | 36 KB | 24 KB (66%) | ✓ | 3rd |
| https://siteintercept.qualtrics.com/dxjsmodule/CoreModule.js?Q_CLIENTVERSION=2.46.0&Q_CLIENTTYPE=web&Q_BRANDID=tripadvisor | 31 KB | 23 KB (74%) | ✓ | 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 InventoryAction168 resources · 3.9 MB · 762 KB savings availableFIX
~761.5 KiB of savings available
| # | Resource | Type | Size | Cache | Unused | 3rd party | Issues |
|---|---|---|---|---|---|---|---|
| — | — | ||||||
| 168 resources | 3.9 MiB | ||||||
FHTTP CachingActionNo cache headersFIX
No Cache-Control header
Adding a Cache-Control header can significantly improve repeat-visit performance.
BImage Optimization30 images, 0 KB saveableREVIEW
A+Text CompressionAll text resources are compressedPASS
A+Font Loading6 fonts (74 KB)PASS
Web fonts
6
74 KB total
Render-blocking
0
of 6
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
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: Axis12 Ltd
Network Waterfall168 requests over 6737msINFO
Third-Party Script CostPer-script blocking time, transfer cost, and cache headersINFO
| Script | Category | Execution | Transfer | Unused | Monthly Cost | Verdict |
|---|---|---|---|---|---|---|
www.cdn-net.com www.cdn-net.com | Other | 2255ms | 31 KB | — | $30/mo | Costly |
Unattributable Unattributable | Other | 1628ms | 0 KB | — | $22/mo | Costly |
cache.vtrcdn.com cache.vtrcdn.com | Other | 1032ms | 78 KB | 49% | $14/mo | Costly |
www.viator.com www.viator.com | Other | 780ms | 54 KB | — | $10/mo | Costly |
dd.viator.com dd.viator.com | Other | 250ms | 39 KB | — | $3/mo | Costly |
siteintercept.qualtrics.com siteintercept.qualtrics.com | Other | 205ms | 36 KB | 58% | $3/mo | Costly |
cache.vtrcdn.com cache.vtrcdn.com | Other | 160ms | 22 KB | — | $2/mo | Optional |
beacon.riskified.com beacon.riskified.com | Other | 138ms | 18 KB | — | $2/mo | Optional |
fbauth.viator.com fbauth.viator.com | Other | 119ms | 90 KB | 61% | $2/mo | Optional |
apis.google.com apis.google.com | Other | 82ms | 34 KB | — | $1/mo | Optional |
siteintercept.qualtrics.com siteintercept.qualtrics.com | Other | 73ms | 14 KB | — | $1/mo | Optional |
prod.accdab.net prod.accdab.net | Other | 68ms | 11 KB | — | $1/mo | Optional |
cache.vtrcdn.com cache.vtrcdn.com | Other | 60ms | 36 KB | 66% | $1/mo | Optional |
accounts.google.com accounts.google.com | Other | 53ms | 96 KB | 75% | $1/mo | Optional |
These scripts may cost more than they're worth
- www.cdn-net.com adds 2255ms and costs ~$30/month
- Unattributable adds 1628ms and costs ~$22/month
- cache.vtrcdn.com adds 1032ms and costs ~$14/month
- www.viator.com adds 780ms and costs ~$10/month
- dd.viator.com adds 250ms and costs ~$3/month
- siteintercept.qualtrics.com adds 205ms 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.cdn-net.com takes 2255ms 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 1628ms 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
cache.vtrcdn.com takes 1032ms 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.viator.com takes 780ms 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
dd.viator.com takes 250ms 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
siteintercept.qualtrics.com takes 205ms 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
58% of siteintercept.qualtrics.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
61% of fbauth.viator.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
66% of cache.vtrcdn.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
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