Performance
· 27 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.
3.67 s
Largest Contentful Paint Largest Contentful Paint — how long until the largest visible element loads. Under 2.5s is good.
10.12 s
Total Blocking Time Total Blocking Time — total time the main thread was blocked, preventing user input. Under 200ms is good.
868 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.
5.47 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.
12.09 s
Page Load Progression
DThird-Party ImpactAction100% third-party, 0 ms blockingFIX
DJS Execution CostAction3034ms total JS executionFIX
Main Thread Breakdown
| Script | Total | Scripting | Parse/Compile | Party |
|---|---|---|---|---|
| https://vercel.com/_next/static/immutable/chunks/2613ojn1riu09.js | 1498ms | 1341ms | 26ms | 3rd |
| Unattributable | 471ms | 20ms | 0ms | 1st |
| https://vercel.com/login?next=%2Fsso-api%3Furl%3Dhttps%253A%252F%252Ftravel-itinerary-fljaat4j5-alterlavi100-2079.vercel.app%252F%26nonce%3D0a8688d8cd9e7d9c819568645fdfeb91f22b08e1ee831c92c653a0913696ba72 | 440ms | 222ms | 39ms | 3rd |
| https://vercel.com/_next/static/immutable/chunks/2edrk-2rsv80r.js | 150ms | 140ms | 2ms | 3rd |
| https://vercel.com/_next/static/immutable/chunks/0ezlgp2-j0_2m.js | 145ms | 133ms | 9ms | 3rd |
| https://vercel.com/_stream/external/cdn.sift.com/s.js | 140ms | 125ms | 4ms | 3rd |
| https://vercel.com/_next/static/immutable/chunks/2f0i_nrfelq8q.js | 117ms | 94ms | 11ms | 3rd |
| https://vercel.com/_next/static/immutable/chunks/1yz4juxqdadjx.css | 73ms | 0ms | 0ms | 3rd |
DJS BundlesAction89 scripts, 330 KB unusedFIX
Downloaded but never executed on this page.
| Script | Size | Unused | Minified | Party |
|---|---|---|---|---|
| https://accounts.google.com/gsi/client | 100 KB | 76 KB (76%) | ✓ | 3rd |
| https://vercel.com/_next/static/immutable/chunks/1ljva5st7dbco.js | 43 KB | 43 KB (100%) | ✓ | 3rd |
| https://vercel.com/_next/static/immutable/chunks/2y3phnsli5ol3.js | 56 KB | 39 KB (71%) | ✓ | 3rd |
| https://vercel.com/_next/static/immutable/chunks/1966ac9cp3_ed.js | 48 KB | 38 KB (84%) | ✓ | 3rd |
| https://vercel.com/_next/static/immutable/chunks/0ezlgp2-j0_2m.js | 47 KB | 28 KB (59%) | ✓ | 3rd |
| https://vercel.com/_next/static/immutable/chunks/454ldg3hxfogb.js | 64 KB | 27 KB (44%) | ✓ | 3rd |
| https://vercel.com/_next/static/immutable/chunks/1w9mx23ld0_rs.js | 36 KB | 27 KB (75%) | ✓ | 3rd |
| https://vercel.com/_next/static/immutable/chunks/2613ojn1riu09.js | 83 KB | 26 KB (32%) | ✓ | 3rd |
| https://vercel.com/_next/static/immutable/chunks/165tic2ofoshr.js | 29 KB | 26 KB (89%) | ✓ | 3rd |
| https://vercel.com/_next/static/immutable/chunks/0kzvtj3ji3_q2.js | 15 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
DPage Weight InventoryAction129 resources · 2.1 MB · 330 KB savings availableFIX
~330.1 KiB of savings available
| # | Resource | Type | Size | Cache | Unused | 3rd party | Issues |
|---|---|---|---|---|---|---|---|
| — | — | ||||||
| 129 resources | 2.1 MiB | ||||||
DHTTP CachingActionno-store (uncacheable)FIX
no-store, max-age=0
| Directive | Value | Meaning |
|---|---|---|
| no-store | — | Never cache this response |
| max-age | 0 | Cache for 0 seconds |
CPage Weight BudgetAction2.1 MB transferred, 129 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
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
BImage Optimization7 images, 0 KB saveableREVIEW
BHTTP/3 (QUIC)HTTP/3 not advertisedREVIEW
CDocument CompressionActionDocument response served uncompressedREVIEW
BAsset Compression1 of 1 asset host serve text uncompressedREVIEW
BServer-Timing ObservabilityNo Server-Timing header foundREVIEW
BJavaScript Blocking1 JS blocking issue(s) detectedREVIEW
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 (123 KB)PASS
Web fonts
3
123 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 Hints18 hints, 0 missing preconnectsPASS
Current Resource Hints
18 resource hints configured
A+LCP Image PreloadLCP preload audit not availablePASS
A+Main HTML Cache-ControlMain HTML uses no-store -- correct for sensitive/dynamic contentPASS
A+Server Response Intelligence1 server-response signal(s) detectedPASS
A+Render-Blocking ResourcesNo render-blocking resources detectedPASS
A+Third-Party ResourcesNo third-party resources detectedPASS
ACSS Performance Depth1 CSS depth issue(s) detectedPASS
Network Waterfall129 requests over 1961msINFO
Third-Party Script CostPer-script blocking time, transfer cost, and cache headersINFO
| Script | Category | Execution | Transfer | Unused | Monthly Cost | Verdict |
|---|---|---|---|---|---|---|
vercel.com vercel.com | Other | 1498ms | 83 KB | 32% | $20/mo | Costly |
vercel.com vercel.com | Other | 440ms | 30 KB | — | $6/mo | Costly |
vercel.com vercel.com | Other | 150ms | 12 KB | — | $2/mo | Optional |
vercel.com vercel.com | Other | 145ms | 47 KB | 59% | $2/mo | Optional |
vercel.com vercel.com | Other | 140ms | 22 KB | — | $2/mo | Optional |
vercel.com vercel.com | Other | 117ms | 47 KB | — | $2/mo | Optional |
vercel.com vercel.com | Other | 73ms | 136 KB | — | $1/mo | Optional |
These scripts may cost more than they're worth
- vercel.com adds 1498ms and costs ~$20/month
- vercel.com adds 440ms and costs ~$6/month
84% 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
vercel.com takes 1498ms 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
vercel.com takes 440ms 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 vercel.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
Image Optimization6 images, 4 KB total, 0 KB wastedINFO
Image Optimization Audit
Total Images
6
Total Size
4 KB