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Performance

· 15 checks — Lighthouse + waterfall + sustainability rolled into one auditable list.
SCORE
68
GRADE
D
FIX
6
REVIEW
2
PASS
5
INFO
2

Performance-focused optimization plan with CWV assessment, top offenders, and time estimates

Mobile Desktop
73
Performance Overall performance score (0–100) based on Core Web Vitals and other metrics. 90+ is good.
94
Accessibility Measures how accessible the page is for users with disabilities. Checks color contrast, ARIA labels, and semantic HTML.
69
Best Practices Checks for modern web development best practices including HTTPS, no console errors, and secure JavaScript.
100
SEO Measures basic SEO optimizations: meta tags, crawlability, link text, and mobile friendliness.

First Contentful Paint First Contentful Paint — how long until the browser renders the first piece of content. Under 1.8s is good.

1.15 s

Largest Contentful Paint Largest Contentful Paint — how long until the largest visible element loads. Under 2.5s is good.

2.21 s

Total Blocking Time Total Blocking Time — total time the main thread was blocked, preventing user input. Under 200ms is good.

207 ms

Cumulative Layout Shift Cumulative Layout Shift — measures visual stability. How much the page layout shifts during loading. Under 0.1 is good.

0.037

Speed Index Speed Index — how quickly content is visually displayed during load. Under 3.4s is good.

2.86 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.

5.28 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 s
Checks
15
5 PASS 2 REVIEW 6 FIX
F
Page Weight Budget
Action
5.0 MB transferred, 106 requests
FIX
5.0 MB transferred, 106 requests
Critical::
Page weighs 13.0 MB (5.0 MB transferred)
Warning::
JavaScript is 2.6 MB — consider code splitting or lazy loading
Large JavaScript bundles delay interactivity. Split code by route or defer non-critical scripts.
Got: 2.6 MB
Warning::
Images are 1.3 MB — compress or use modern formats
Convert images to WebP/AVIF and resize to display dimensions to reduce transfer size.
Got: 1.3 MB
Info::
Fonts are 240 KB — consider subsetting or using system fonts
Subset fonts to include only used characters, or switch to system font stacks.
Got: 240 KB
Warning::
106 HTTP requests — consider bundling or reducing
Each request adds latency. Bundle small files, use sprites, or eliminate unnecessary requests.
Info::
Estimated 1.1 g CO2 per page load
5.0 MB / 2.4 MB budget
5.0 MB transferred
106 requests
1.1 g CO2 per page load
JavaScript 2.6 MiB 52%
Images 1.3 MiB 27%
Other 676.7 KiB 13%
Fonts 240.0 KiB 5%
HTML 109.8 KiB 2%
Other 58.7 KiB 1%
CSS 19.2 KiB 0%
Other 19.1 KiB 0%
Other 1.7 KiB 0%
Other 0 B 0%
0 2.4 MB 4.9 MB
Over budget

Large JavaScript bundles delay interactivity. Split code by route or defer non-critical scripts.

Why this matters

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.

Why this matters

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.

Why this matters

Font payload is large — subset to used glyphs only, or fall back to system fonts (zero load time).

Source: web.dev font loading

Each request adds latency. Bundle small files, use sprites, or eliminate unnecessary requests.

Why this matters

High HTTP request count — bundling, sprite-ing, and HTTP/2 server push can reduce per-request overhead.

Source: web.dev

D
Third-Party Impact
Action
100% third-party, 0 ms blocking
FIX
100% third-party, 0 ms blocking
Warning::
Third-party code accounts for 100% of page weight (5.0 MiB of 5.0 MiB)
Info::
Third-party blocking time is low (0 ms)
100%
First-party Third-party
D
JS Execution Cost
Action
3414ms total JS execution
FIX
3414ms total JS execution
Warning::
https://st.dynamicyield.com/st?sec=8791140&ref=&sc...: 968ms CPU time
Warning::
https://cdn.dynamicyield.com/api/8791140/api_dynam...: 569ms CPU time
Warning::
https://www.jetblue.com/_next/static/chunks/0_wckr...: 426ms CPU time
Warning::
https://static.jetblue.com/49b10c8ad172622fbc74/di...: 376ms CPU time
Warning::
Unattributable: 361ms CPU time
Warning::
Third-party scripts: 3414ms (100% of total)

Main Thread Breakdown

Script Evaluation 68% Other 14% Script Parsing & Compilation 9% Style & Layout 5%
ScriptTotalScriptingParse/CompileParty
https://st.dynamicyield.com/st?sec=8791140&ref=&scriptVersion=2.83.0&inHead=true&id=0&jsession=vq3whlw5y7ds9wylf5y6i2bsdgoovjym&isSesNew=true&dyid_server=0&ctx=%7B%22type%22%3A%22HOMEPAGE%22%7D&noConsent=true968ms879ms4ms3rd
https://cdn.dynamicyield.com/api/8791140/api_dynamic.js569ms472ms42ms3rd
https://www.jetblue.com/_next/static/chunks/0_wckrpl-en4q.js426ms365ms9ms3rd
https://static.jetblue.com/49b10c8ad172622fbc74/dist/wc-auth-wrapper/wc-auth-wrapper-element.js376ms290ms13ms3rd
Unattributable361ms13ms0ms3rd
https://www.jetblue.com/230ms10ms31ms3rd
https://www.googletagmanager.com/gtm.js?id=GTM-5J92P6SM218ms126ms76ms3rd
https://www.jetblue.com/_next/static/chunks/0nhjsm87u22zm.js92ms59ms28ms3rd
https://sdk.joinsherpa.io/widget.js?appId=spY3MjM0OT&affiliateId=jetblue69ms48ms20ms3rd
https://consent.trustarc.com/asset/notice.js/v/v1.7-172955ms38ms4ms3rd

Showing top 10 of 11 scripts

F
JS Bundles
Action
36 scripts, 1.2 MB unused
FIX
36 scripts, 1.2 MB unused
Warning::
https://static.jetblue.com/49b10c8ad172622fbc74/di...: 293 KB unused (67%)
Consider code splitting or tree shaking to reduce unused code.
Warning::
https://sdk.joinsherpa.io/widget.js?appId=spY3MjM0...: 250 KB unused (38%)
Consider code splitting or tree shaking to reduce unused code.
Warning::
https://www.jetblue.com/_next/static/chunks/0nhjsm...: 197 KB unused (74%)
Consider code splitting or tree shaking to reduce unused code.
Warning::
https://sdk.asapp.com/chat-sdk.js: 81 KB unused (68%)
Consider code splitting or tree shaking to reduce unused code.
Warning::
https://www.googletagmanager.com/gtm.js?id=GTM-5J9...: 74 KB unused (38%)
Consider code splitting or tree shaking to reduce unused code.
Info::
Total unused JavaScript: 1.2 MB
1206 KB unused JavaScript

Downloaded but never executed on this page.

ScriptSizeUnusedMinifiedParty
https://static.jetblue.com/49b10c8ad172622fbc74/dist/wc-auth-wrapper/wc-auth-wrapper-element.js437 KB293 KB (67%)✓3rd
https://sdk.joinsherpa.io/widget.js?appId=spY3MjM0OT&affiliateId=jetblue664 KB250 KB (38%)✓3rd
https://www.jetblue.com/_next/static/chunks/0nhjsm87u22zm.js271 KB197 KB (74%)✓3rd
https://sdk.asapp.com/chat-sdk.js119 KB81 KB (68%)✓3rd
https://www.googletagmanager.com/gtm.js?id=GTM-5J92P6SM193 KB74 KB (38%)✓3rd
https://www.googletagmanager.com/gtm.js?id=GTM-T69MLS2R118 KB68 KB (58%)✓3rd
https://cdn.dynamicyield.com/api/8791140/api_static.js112 KB59 KB (53%)✓3rd
https://edge.fullstory.com/s/fs.js80 KB53 KB (67%)✓3rd
https://js.appboycdn.com/web-sdk/6.3/braze.min.js64 KB45 KB (71%)✓3rd
https://www.jetblue.com/_next/static/chunks/0_wckrpl-en4q.js70 KB23 KB (33%)✓3rd

Consider code splitting or tree shaking to reduce unused code.

Why this matters

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.

Why this matters

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.

Why this matters

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.

Why this matters

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.

Why this matters

This bundle has high unused code — code-split or tree-shake to ship only what executes.

Source: web.dev / Lighthouse coverage

F
Page Weight Inventory
Action
106 resources · 5.0 MB · 1.2 MB savings available
FIX
106 resources · 5.0 MB · 1.2 MB savings available
Warning::
Page weight 4.0 MB over 1MB target
Got: 5.0 MB Expected: ≤ 1 MB
Info::
~1.2 MB of savings available
Warning::
105 third-party resources (100% of weight)
Info::
5 resources over 200KB
106 resources · 5.0 MiB · 105 third-party 4.0 MiB over 1MB target
JavaScript 54% · 2.7 MiB
Image 27% · 1.4 MiB
Document 8% · 388.4 KiB
Other 7% · 346.9 KiB
Font 5% · 240.0 KiB
CSS 0% · 19.2 KiB

~1.2 MiB of savings available

Remove unused JavaScript: 1.2 MiB
F
HTTP Caching
Action
No cache headers
FIX
No cache headers
Warning::
No Cache-Control header found
Browsers will use heuristic caching, which can be unpredictable. Set explicit cache headers.

No Cache-Control header

Adding a Cache-Control header can significantly improve repeat-visit performance.

B
Image Optimization
27 images, 0 KB saveable
REVIEW
27 images, 0 KB saveable
Info::
All images are well-optimized
27 images 1.3 MB
0 oversized -0 KB
13 legacy format
0 missing dimensions CLS risk
C
Green Hosting
Action
Whether the site is served from green-energy infrastructure
REVIEW

Green Hosting

No green hosting detected

A+
Text Compression
All text resources are compressed
PASS
All text resources are compressed
Info::
All text resources are compressed
All text resources are properly compressed.
A+
Font Loading
5 fonts (240 KB)
PASS
5 fonts (240 KB)
Info::
5 font(s) use font-display: swap (FOUT risk but functional)

Web fonts

5

240 KB total

Render-blocking

0

of 5

Dominant font-display

swap

Most common across fonts

Font loading timeline
Transfer FOIT (block) FOUT (swap)
0 ms 500 ms 1.0 s 1.5 s 2.0 s 2.5 s FCP 1.2 s LCP 2.2 shttps://www.jetblue.com/_next/static/media/klarheit_book-s.p.0mkqyv87c5ss8.woff2klarheit_book-s.p.0mkqy... https://www.jetblue.com/_next/static/media/klarheit_book-s.p.0mkqyv87c5ss8.woff2 — 41.5 KiB — 9 ms — font-display: swaphttps://www.jetblue.com/_next/static/media/klarheit_semi-s.p.0aw9gf1e7~8aq.woff2klarheit_semi-s.p.0aw9g... https://www.jetblue.com/_next/static/media/klarheit_semi-s.p.0aw9gf1e7~8aq.woff2 — 41.0 KiB — 41 ms — font-display: swaphttps://www.jetblue.com/_next/static/media/klarheit_xbold-s.p.149-m-o3~0rpb.woff2klarheit_xbold-s.p.149-... https://www.jetblue.com/_next/static/media/klarheit_xbold-s.p.149-m-o3~0rpb.woff2 — 40.2 KiB — 28 ms — font-display: swaphttps://consent.trustarc.com/get?name=ESKlarheitGrotesk-Bk.woffget https://consent.trustarc.com/get?name=ESKlarheitGrotesk-Bk.woff — 58.7 KiB — 369 ms — font-display: swaphttps://consent.trustarc.com/get?name=ESKlarheitGrotesk-Smbd.woffget https://consent.trustarc.com/get?name=ESKlarheitGrotesk-Smbd.woff — 58.5 KiB — 205 ms — font-display: swap
klarheit_book-s.p.0mkqy... woff2 swap
Size 41 KB
Load time 9 ms
Start 696 ms
Risk FOUT — text flashes from fallback to web font
klarheit_semi-s.p.0aw9g... woff2 swap
Size 41 KB
Load time 41 ms
Start 697 ms
Risk FOUT — text flashes from fallback to web font
klarheit_xbold-s.p.149-... woff2 swap
Size 40 KB
Load time 28 ms
Start 698 ms
Risk FOUT — text flashes from fallback to web font
get woff swap
Size 59 KB
Load time 369 ms
Start 2.5 s
Risk FOUT — text flashes from fallback to web font
  • Convert to woff2 for ~30% smaller file size
get woff swap
Size 59 KB
Load time 205 ms
Start 2.5 s
Risk FOUT — text flashes from fallback to web font
  • 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 ~35 KB and ~70 ms

A+
Resource Caching
All resources properly cached
PASS
All resources properly cached
Info::
No caching issues found
All static resources have appropriate caching headers.
A+
Critical Rendering Path
No render-blocking resources
PASS
No render-blocking resources
Info::
No render-blocking resources detected
A+
Resource Hints
No optimization needed
PASS
No optimization needed
Info::
No resource hint issues
Network Waterfall
106 requests over 8799ms
INFO
0 ms 1.0 s 2.0 s 3.0 s 4.0 s 5.0 s 6.0 s 7.0 s 8.0 s 9.0 s FCP 1.2 s LCP 2.2 shttps://jetblue.com// https://jetblue.com/ — 301 — 486 B — 525 ms — h2https://www.jetblue.com/www.jetblue.com/ https://www.jetblue.com/ — 200 — 108.4 KiB — 157 ms — h2https://www.jetblue.com/_next/static/media/klarheit_book-s.p.0mkqyv87c5ss8.woff2www.jetblue.com/_next/static/media/... https://www.jetblue.com/_next/static/media/klarheit_book-s.p.0mkqyv87c5ss8.woff2 — 200 — 41.5 KiB — 9 ms — h2https://www.jetblue.com/_next/static/media/klarheit_semi-s.p.0aw9gf1e7~8aq.woff2www.jetblue.com/_next/static/media/... https://www.jetblue.com/_next/static/media/klarheit_semi-s.p.0aw9gf1e7~8aq.woff2 — 200 — 41.0 KiB — 41 ms — h2https://www.jetblue.com/_next/static/media/klarheit_xbold-s.p.149-m-o3~0rpb.woff2www.jetblue.com/_next/static/media/... https://www.jetblue.com/_next/static/media/klarheit_xbold-s.p.149-m-o3~0rpb.woff2 — 200 — 40.2 KiB — 28 ms — h2https://www.jetblue.com/_next/static/chunks/06n61u~q3t7qv.csswww.jetblue.com/_next/static/chunks... https://www.jetblue.com/_next/static/chunks/06n61u~q3t7qv.css — 200 — 18.7 KiB — 13 ms — h2https://www.jetblue.com/_next/static/chunks/16n-h467x-sa8.csswww.jetblue.com/_next/static/chunks... https://www.jetblue.com/_next/static/chunks/16n-h467x-sa8.css — 200 — 493 B — 29 ms — h2https://www.googletagmanager.com/gtm.js?id=GTM-5J92P6SMwww.googletagmanager.com/gtm.js?id=... https://www.googletagmanager.com/gtm.js?id=GTM-5J92P6SM — 200 — 193.4 KiB — 291 ms — h2https://static.jetblue.com/49b10c8ad172622fbc74/dist/wc-auth-wrapper/wc-auth-wrapper-element.jsstatic.jetblue.com/49b10c8ad172622f... https://static.jetblue.com/49b10c8ad172622fbc74/dist/wc-auth-wrapper/wc-auth-wrapper-element.js — 200 — 436.7 KiB — 155 ms — h2https://consent.trustarc.com/notice?domain=jetblue.com&c=teconsent&js=nj&noticeType=bb&gtm=1consent.trustarc.com/notice?domain=... https://consent.trustarc.com/notice?domain=jetblue.com&c=teconsent&js=nj&noticeType=bb&gtm=1 — 200 — 6.3 KiB — 54 ms — h2https://static.jetblue.com/243baff993e46b2c0433/felog/felog.jsstatic.jetblue.com/243baff993e46b2c... https://static.jetblue.com/243baff993e46b2c0433/felog/felog.js — 200 — 12.0 KiB — 141 ms — h2https://cms.jetblue.com/dam/ui-assets/imagery/logos/jetblue-logo.svg?auto=webp&width=32&quality=75cms.jetblue.com/dam/ui-assets/image... https://cms.jetblue.com/dam/ui-assets/imagery/logos/jetblue-logo.svg?auto=webp&width=32&quality=75 — 200 — 1022 B — 148 ms — h2https://www.jetblue.com/_next/static/chunks/0axj_zje~44.0.jswww.jetblue.com/_next/static/chunks... https://www.jetblue.com/_next/static/chunks/0axj_zje~44.0.js — 200 — 9.4 KiB — 43 ms — h2https://www.jetblue.com/_next/static/chunks/17z1w7bys5_4s.jswww.jetblue.com/_next/static/chunks... https://www.jetblue.com/_next/static/chunks/17z1w7bys5_4s.js — 200 — 11.4 KiB — 38 ms — h2https://www.jetblue.com/_next/static/chunks/0ae-y3ieog_ji.jswww.jetblue.com/_next/static/chunks... https://www.jetblue.com/_next/static/chunks/0ae-y3ieog_ji.js — 200 — 36.7 KiB — 59 ms — h2https://www.jetblue.com/_next/static/chunks/0_wckrpl-en4q.jswww.jetblue.com/_next/static/chunks... https://www.jetblue.com/_next/static/chunks/0_wckrpl-en4q.js — 200 — 69.9 KiB — 73 ms — h2https://www.jetblue.com/_next/static/chunks/turbopack-0xf4bb-rcwobw.jswww.jetblue.com/_next/static/chunks... https://www.jetblue.com/_next/static/chunks/turbopack-0xf4bb-rcwobw.js — 200 — 4.5 KiB — 45 ms — h2https://www.jetblue.com/_next/static/chunks/0fb7w_mlgdl6f.jswww.jetblue.com/_next/static/chunks... https://www.jetblue.com/_next/static/chunks/0fb7w_mlgdl6f.js — 200 — 2.2 KiB — 41 ms — h2https://www.jetblue.com/_next/static/chunks/0t8sj65wk580x.jswww.jetblue.com/_next/static/chunks... https://www.jetblue.com/_next/static/chunks/0t8sj65wk580x.js — 200 — 13.0 KiB — 59 ms — h2https://www.jetblue.com/_next/static/chunks/0c2yzwgt6~uxc.jswww.jetblue.com/_next/static/chunks... https://www.jetblue.com/_next/static/chunks/0c2yzwgt6~uxc.js — 200 — 10.7 KiB — 72 ms — h2https://www.jetblue.com/_next/static/chunks/0o_htt5ntz-6f.jswww.jetblue.com/_next/static/chunks... https://www.jetblue.com/_next/static/chunks/0o_htt5ntz-6f.js — 200 — 30.4 KiB — 65 ms — h2https://www.jetblue.com/_next/static/chunks/181sud9sx5lcd.jswww.jetblue.com/_next/static/chunks... https://www.jetblue.com/_next/static/chunks/181sud9sx5lcd.js — 200 — 18.1 KiB — 51 ms — h2https://www.jetblue.com/_next/static/chunks/08v1a~u9cg.d6.jswww.jetblue.com/_next/static/chunks... https://www.jetblue.com/_next/static/chunks/08v1a~u9cg.d6.js — 200 — 5.1 KiB — 47 ms — h2https://www.jetblue.com/_next/static/chunks/0nhjsm87u22zm.jswww.jetblue.com/_next/static/chunks... https://www.jetblue.com/_next/static/chunks/0nhjsm87u22zm.js — 200 — 270.9 KiB — 80 ms — h2https://www.jetblue.com/manifest.webmanifestwww.jetblue.com/manifest.webmanifes... https://www.jetblue.com/manifest.webmanifest — 200 — 1.7 KiB — 28 ms — h2https://cms.jetblue.com/dam/ui-assets/imagery/logos/jetblue_supernav.svg?auto=webp&width=1920&quality=75cms.jetblue.com/dam/ui-assets/image... https://cms.jetblue.com/dam/ui-assets/imagery/logos/jetblue_supernav.svg?auto=webp&width=1920&quality=75 — 200 — 1.3 KiB — 63 ms — h2https://cms.jetblue.com/dam/ui-assets/imagery/logos/jetblue_vacations_supernav.svg?auto=webp&width=1920&quality=75cms.jetblue.com/dam/ui-assets/image... https://cms.jetblue.com/dam/ui-assets/imagery/logos/jetblue_vacations_supernav.svg?auto=webp&width=1920&quality=75 — 200 — 2.9 KiB — 64 ms — h2https://cms.jetblue.com/dam/ui-assets/imagery/logos/trueblue-travel_deep-blue.svg?auto=webp&width=1920&quality=75cms.jetblue.com/dam/ui-assets/image... https://cms.jetblue.com/dam/ui-assets/imagery/logos/trueblue-travel_deep-blue.svg?auto=webp&width=1920&quality=75 — 200 — 1.9 KiB — 67 ms — h2https://cms.jetblue.com/dam/ui-assets/imagery/icons/silhouette-white-2.svg?auto=webp&width=1920&quality=75cms.jetblue.com/dam/ui-assets/image... https://cms.jetblue.com/dam/ui-assets/imagery/icons/silhouette-white-2.svg?auto=webp&width=1920&quality=75 — 200 — 1020 B — 61 ms — h2https://cms.jetblue.com/dam/ui-assets/imagery/booker/beach-greenery-booker-.jpg?auto=webp&width=1920&quality=75cms.jetblue.com/dam/ui-assets/image... https://cms.jetblue.com/dam/ui-assets/imagery/booker/beach-greenery-booker-.jpg?auto=webp&width=1920&quality=75 — 200 — 178.5 KiB — 183 ms — h2
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https://consent.trustarc.com/analytics?action=7&domain=jetblue.com&implied=0&session=01fcb29bf5c641b2ac66dfcafb2a7448&new=1&referer=https://www.jetblue.com — 200 — 462 B — 184 ms — h2https://sdk.iad-07.braze.com/api/v3/data/sdk.iad-07.braze.com/api/v3/data/ https://sdk.iad-07.braze.com/api/v3/data/ — 201 — 880 B — 203 ms — h2https://siteintercept.qualtrics.com/WRSiteInterceptEngine/Targeting.php?Q_ZoneID=ZN_9NrVZpkFcamQFbo&Q_CLIENTVERSION=2.46.0&Q_CLIENTTYPE=websiteintercept.qualtrics.com/WRSiteI... https://siteintercept.qualtrics.com/WRSiteInterceptEngine/Targeting.php?Q_ZoneID=ZN_9NrVZpkFcamQFbo&Q_CLIENTVERSION=2.46.0&Q_CLIENTTYPE=web — 200 — 2.0 KiB — 142 ms — h2https://consent.trustarc.com/cm/jetblue.com/modalconfig?type=jetblue_slider&layout=default_eu&locale=en&country=brconsent.trustarc.com/cm/jetblue.com... https://consent.trustarc.com/cm/jetblue.com/modalconfig?type=jetblue_slider&layout=default_eu&locale=en&country=br — 200 — 77.1 KiB — 19 ms — h2https://consent.trustarc.com/images/loading.gifconsent.trustarc.com/images/loading... https://consent.trustarc.com/images/loading.gif — 200 — 2.1 KiB — 5 ms — h2https://edge.fullstory.com/s/settings/4HV1Q/v1/web?ngsw-bypass=trueedge.fullstory.com/s/settings/4HV1Q... https://edge.fullstory.com/s/settings/4HV1Q/v1/web?ngsw-bypass=true — 200 — 53.7 KiB — 10 ms — h2https://siteintercept.qualtrics.com/dxjsmodule/CoreModule.js?Q_CLIENTVERSION=2.46.0&Q_CLIENTTYPE=web&Q_BRANDID=jetbluevocsiteintercept.qualtrics.com/dxjsmod... https://siteintercept.qualtrics.com/dxjsmodule/CoreModule.js?Q_CLIENTVERSION=2.46.0&Q_CLIENTTYPE=web&Q_BRANDID=jetbluevoc — 200 — 30.9 KiB — 12 ms — h2https://consent.trustarc.com/get?name=Powered-By-TrustArc.pngconsent.trustarc.com/get?name=Power... https://consent.trustarc.com/get?name=Powered-By-TrustArc.png — 200 — 2.2 KiB — 5 ms — h2https://consent-pref.trustarc.com/images/arrow.pngconsent-pref.trustarc.com/images/ar... https://consent-pref.trustarc.com/images/arrow.png — 200 — 1.4 KiB — 36 ms — h2https://consent.trustarc.com/get?name=ESKlarheitGrotesk-Bk.woffconsent.trustarc.com/get?name=ESKla... https://consent.trustarc.com/get?name=ESKlarheitGrotesk-Bk.woff — 200 — 58.7 KiB — 369 ms — h2https://consent.trustarc.com/get?name=ESKlarheitGrotesk-Smbd.woffconsent.trustarc.com/get?name=ESKla... https://consent.trustarc.com/get?name=ESKlarheitGrotesk-Smbd.woff — 200 — 58.5 KiB — 205 ms — h2https://cdn.dynamicyield.com/api/8791140/images/c28152b90d8c.webpcdn.dynamicyield.com/api/8791140/im... https://cdn.dynamicyield.com/api/8791140/images/c28152b90d8c.webp — 200 — 240.8 KiB — 64 ms — h2https://cdn.dynamicyield.com/api/8791140/images/74ac7ae85fc1.webpcdn.dynamicyield.com/api/8791140/im... https://cdn.dynamicyield.com/api/8791140/images/74ac7ae85fc1.webp — 200 — 70.6 KiB — 17 ms — h2https://cdn.dynamicyield.com/api/8791140/images/bd00dbfca44f.webpcdn.dynamicyield.com/api/8791140/im... https://cdn.dynamicyield.com/api/8791140/images/bd00dbfca44f.webp — 200 — 353.1 KiB — 69 ms — h2https://siteintercept.qualtrics.com/dxjsmodule/7.f7df015b06d8a90ce822.chunk.js?Q_CLIENTVERSION=2.46.0&Q_CLIENTTYPE=web&Q_BRANDID=jetbluevocsiteintercept.qualtrics.com/dxjsmod... https://siteintercept.qualtrics.com/dxjsmodule/7.f7df015b06d8a90ce822.chunk.js?Q_CLIENTVERSION=2.46.0&Q_CLIENTTYPE=web&Q_BRANDID=jetbluevoc — 200 — 1.4 KiB — 23 ms — h2https://siteintercept.qualtrics.com/dxjsmodule/1.bc67e778235741631577.chunk.js?Q_CLIENTVERSION=2.46.0&Q_CLIENTTYPE=web&Q_BRANDID=jetbluevocsiteintercept.qualtrics.com/dxjsmod... https://siteintercept.qualtrics.com/dxjsmodule/1.bc67e778235741631577.chunk.js?Q_CLIENTVERSION=2.46.0&Q_CLIENTTYPE=web&Q_BRANDID=jetbluevoc — 200 — 7.1 KiB — 19 ms — h2https://siteintercept.qualtrics.com/dxjsmodule/FeedbackButtonModule.js?Q_CLIENTVERSION=2.46.0&Q_CLIENTTYPE=web&Q_BRANDID=jetbluevocsiteintercept.qualtrics.com/dxjsmod... https://siteintercept.qualtrics.com/dxjsmodule/FeedbackButtonModule.js?Q_CLIENTVERSION=2.46.0&Q_CLIENTTYPE=web&Q_BRANDID=jetbluevoc — 200 — 19.4 KiB — 26 ms — h2https://siteintercept.qualtrics.com/WRSiteInterceptEngine/Asset.php?Module=SI_2fJ8lClnFwH6wjr&Version=5&Q_ORIGIN=https://www.jetblue.com&Q_CLIENTVERSION=2.46.0&Q_CLIENTTYPE=web&Q_BrandTier=RQqcwhV2J1&Q_ARCACHEVERSION=21&Q_BRANDDC=iad1siteintercept.qualtrics.com/WRSiteI... https://siteintercept.qualtrics.com/WRSiteInterceptEngine/Asset.php?Module=SI_2fJ8lClnFwH6wjr&Version=5&Q_ORIGIN=https://www.jetblue.com&Q_CLIENTVERSION=2.46.0&Q_CLIENTTYPE=web&Q_BrandTier=RQqcwhV2J1&Q_ARCACHEVERSION=21&Q_BRANDDC=iad1 — 200 — 899 B — 55 ms — h2https://siteintercept.qualtrics.com/WRSiteInterceptEngine/Asset.php?Module=CR_3p3HWyNP6lt35fr&Version=4&Q_InterceptID=SI_2fJ8lClnFwH6wjr&Q_ORIGIN=https://www.jetblue.com&Q_CLIENTVERSION=2.46.0&Q_CLIENTTYPE=web&Q_BrandTier=RQqcwhV2J1&Q_ARCACHEVERSION=21&Q_BRANDDC=iad1siteintercept.qualtrics.com/WRSiteI... https://siteintercept.qualtrics.com/WRSiteInterceptEngine/Asset.php?Module=CR_3p3HWyNP6lt35fr&Version=4&Q_InterceptID=SI_2fJ8lClnFwH6wjr&Q_ORIGIN=https://www.jetblue.com&Q_CLIENTVERSION=2.46.0&Q_CLIENTTYPE=web&Q_BrandTier=RQqcwhV2J1&Q_ARCACHEVERSION=21&Q_BRANDDC=iad1 — 200 — 1.0 KiB — 53 ms — h2https://siteintercept.qualtrics.com/WRSiteInterceptEngine/?Q_Impress=1&Q_CID=CR_3p3HWyNP6lt35fr&Q_SIID=SI_2fJ8lClnFwH6wjr&Q_ASID=AS_3MuGGuv1EhPrjTU&Q_CLIENTVERSION=2.46.0&Q_CLIENTTYPE=web&r=1776294369566siteintercept.qualtrics.com/WRSiteI... https://siteintercept.qualtrics.com/WRSiteInterceptEngine/?Q_Impress=1&Q_CID=CR_3p3HWyNP6lt35fr&Q_SIID=SI_2fJ8lClnFwH6wjr&Q_ASID=AS_3MuGGuv1EhPrjTU&Q_CLIENTVERSION=2.46.0&Q_CLIENTTYPE=web&r=1776294369566 — 200 — 226 B — 196 ms — h2https://accounts.jetblue.com/api/v1/sessions/meaccounts.jetblue.com/api/v1/session... https://accounts.jetblue.com/api/v1/sessions/me — 404 — 1.8 KiB — 733 ms — h3https://cb-api.jetblue.com/cb-logger/logcb-api.jetblue.com/cb-logger/log https://cb-api.jetblue.com/cb-logger/log — 200 — 0 B — 206 ms — h3https://cb-api.jetblue.com/cb-logger/logcb-api.jetblue.com/cb-logger/log https://cb-api.jetblue.com/cb-logger/log — 201 — 559 B — 230 ms — h3https://cb-api.jetblue.com/cb-logger/logcb-api.jetblue.com/cb-logger/log https://cb-api.jetblue.com/cb-logger/log — 201 — 559 B — 203 ms — h3
HTML JavaScript CSS Images Fonts XHR/Fetch Other
Third-Party Script Cost
Per-script blocking time, transfer cost, and cache headers
INFO
100% of JavaScript execution is third-party
First-party Third-party 3414ms · 1974KB · €18/mo
st.dynamicyield.com
Other
Costly
Execution 968ms
Transfer 8 KB
Monthly Cost €5/mo
cdn.dynamicyield.com
Other
Costly
Execution 569ms
Transfer 107 KB
Monthly Cost €3/mo
www.jetblue.com
Other
Costly
Execution 426ms
Transfer 70 KB
Unused 33%
Monthly Cost €2/mo
static.jetblue.com
Other
Costly
Execution 376ms
Transfer 437 KB
Unused 67%
Monthly Cost €2/mo
Unattributable
Other
Costly
Execution 361ms
Transfer 0 KB
Monthly Cost €2/mo
www.jetblue.com
Other
Costly
Execution 230ms
Transfer 108 KB
Monthly Cost €1/mo
Google Tag Manager
Tag Manager
Costly
Execution 218ms
Transfer 193 KB
Unused 38%
Monthly Cost €1/mo
www.jetblue.com
Other
Optional
Execution 92ms
Transfer 271 KB
Unused 74%
Monthly Cost €0/mo
sdk.joinsherpa.io
Other
Optional
Execution 69ms
Transfer 664 KB
Unused 38%
Monthly Cost €0/mo
consent.trustarc.com
Other
Optional
Execution 55ms
Transfer 36 KB
Monthly Cost €0/mo
edge.fullstory.com
Other
Optional
Execution 50ms
Transfer 80 KB
Unused 67%
Monthly Cost €0/mo

These scripts may cost more than they're worth

  • st.dynamicyield.com adds 968ms and costs ~€5/month
  • cdn.dynamicyield.com adds 569ms and costs ~€3/month
  • www.jetblue.com adds 426ms and costs ~€2/month
  • static.jetblue.com adds 376ms and costs ~€2/month
  • Unattributable adds 361ms and costs ~€2/month
  • www.jetblue.com adds 230ms and costs ~€1/month
  • Google Tag Manager adds 218ms and costs ~€1/month

100% of JavaScript execution time is spent on third-party scripts. Consider auditing which scripts are essential.

Why this matters

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

st.dynamicyield.com takes 968ms of CPU time. Consider loading it asynchronously or replacing it with a lighter alternative.

Why this matters

This script has high main-thread execution time — optimize hot paths or defer.

Source: web.dev

cdn.dynamicyield.com takes 569ms of CPU time. Consider loading it asynchronously or replacing it with a lighter alternative.

Why this matters

This script has high main-thread execution time — optimize hot paths or defer.

Source: web.dev

www.jetblue.com takes 426ms of CPU time. Consider loading it asynchronously or replacing it with a lighter alternative.

Why this matters

This script has high main-thread execution time — optimize hot paths or defer.

Source: web.dev

static.jetblue.com takes 376ms of CPU time. Consider loading it asynchronously or replacing it with a lighter alternative.

Why this matters

This script has high main-thread execution time — optimize hot paths or defer.

Source: web.dev

67% of static.jetblue.com's code is unused. The script may be loading features you don't use.

Why this matters

Bundle has high unused-code ratio — tree-shaking and route-splitting recover the wasted bytes.

Source: web.dev

Unattributable takes 361ms of CPU time. Consider loading it asynchronously or replacing it with a lighter alternative.

Why this matters

This script has high main-thread execution time — optimize hot paths or defer.

Source: web.dev

www.jetblue.com takes 230ms of CPU time. Consider loading it asynchronously or replacing it with a lighter alternative.

Why this matters

This script has high main-thread execution time — optimize hot paths or defer.

Source: web.dev

Google Tag Manager takes 218ms of CPU time. Consider loading it asynchronously or replacing it with a lighter alternative.

Why this matters

This script has high main-thread execution time — optimize hot paths or defer.

Source: web.dev

74% of www.jetblue.com's code is unused. The script may be loading features you don't use.

Why this matters

Bundle has high unused-code ratio — tree-shaking and route-splitting recover the wasted bytes.

Source: web.dev

67% of edge.fullstory.com's code is unused. The script may be loading features you don't use.

Why this matters

Bundle has high unused-code ratio — tree-shaking and route-splitting recover the wasted bytes.

Source: web.dev

How third-party costs are calculated

All checks on this page are automated. Results are estimates - run targeted manual reviews when the score affects a release decision.

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