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https://aircanada.com

Performance

· 15 checks — Lighthouse + waterfall + sustainability rolled into one auditable list.
SCORE
72
GRADE
C
FIX
6
REVIEW
2
PASS
5
INFO
2

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

Mobile Desktop
56
Performance Overall performance score (0–100) based on Core Web Vitals and other metrics. 90+ is good.
93
Accessibility Measures how accessible the page is for users with disabilities. Checks color contrast, ARIA labels, and semantic HTML.
77
Best Practices Checks for modern web development best practices including HTTPS, no console errors, and secure JavaScript.
83
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.

1.61 s

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

3.34 s

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

332 ms

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

0.001

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

2.84 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.

3.40 s

Page Load Progression

536 ms
1.1 s
1.6 s
2.1 s
2.7 s
3.2 s
3.8 s
4.3 s
Checks
15
5 PASS 2 REVIEW 6 FIX
F
Page Weight Budget
Action
3.4 MB transferred, 104 requests
FIX
3.4 MB transferred, 104 requests
Warning::
Page weighs 10.7 MB (3.4 MB transferred)
Warning::
JavaScript is 1.8 MB — consider code splitting or lazy loading
Large JavaScript bundles delay interactivity. Split code by route or defer non-critical scripts.
Got: 1.8 MB
Warning::
Images are 1.1 MB — compress or use modern formats
Convert images to WebP/AVIF and resize to display dimensions to reduce transfer size.
Got: 1.1 MB
Info::
Fonts are 211 KB — consider subsetting or using system fonts
Subset fonts to include only used characters, or switch to system font stacks.
Got: 211 KB
Warning::
104 HTTP requests — consider bundling or reducing
Each request adds latency. Bundle small files, use sprites, or eliminate unnecessary requests.
Info::
Estimated 0.71 g CO2 per page load
3.4 MB / 2.4 MB budget
3.4 MB transferred
104 requests
0.71 g CO2 per page load
JavaScript 1.8 MiB 52%
Images 1.1 MiB 33%
Other 229.8 KiB 7%
Fonts 211.1 KiB 6%
Other 37.7 KiB 1%
HTML 14.9 KiB 0%
Other 14.2 KiB 0%
CSS 11.9 KiB 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 (3.4 MiB of 3.4 MiB)
Info::
Third-party blocking time is low (0 ms)
100%
First-party Third-party
D
JS Execution Cost
Action
2979ms total JS execution
FIX
2979ms total JS execution
Warning::
https://www.aircanada.com/assets/b23d8f289e32edec2...: 1199ms CPU time
Warning::
https://www.aircanada.com/home/es/es/aco/flights: 494ms CPU time
Warning::
Unattributable: 317ms CPU time
Warning::
https://www.aircanada.com/6jkv/xGJ0/jfQ_/WDDX/sw/Y...: 310ms CPU time
Info::
https://www.aircanada.com/6jkv/xGJ0/jfQ_/WDDX/sw/S...: 231ms CPU time
Warning::
Third-party scripts: 2979ms (100% of total)

Main Thread Breakdown

Script Evaluation 72% Other 12% Style & Layout 6% Parse HTML & CSS 3%
ScriptTotalScriptingParse/CompileParty
https://www.aircanada.com/assets/b23d8f289e32edec2065f3c335af8c367001194a0111199ms956ms6ms3rd
https://www.aircanada.com/home/es/es/aco/flights494ms255ms1ms3rd
Unattributable317ms104ms0ms3rd
https://www.aircanada.com/6jkv/xGJ0/jfQ_/WDDX/sw/Y7OaLzwrkOJzpNXE5S/EltsWg/dQd/0ewtKPG0B310ms257ms28ms3rd
https://www.aircanada.com/6jkv/xGJ0/jfQ_/WDDX/sw/SbOaLzufkOYD/UkZyWg/VGs/fOBwefmYNAg?v=422aa1c9-e5a4-2428-2fc0-6f9e28f45435&t=890059231ms215ms10ms3rd
https://www.aircanada.com/home/runtime.453919a8577c3fd2.js134ms132ms0ms3rd
https://www.aircanada.com/home/vendor.436b440afc06d651.js118ms113ms2ms3rd
https://www.aircanada.com/6jkv/xGJ0/jfQ_/WDDX/sw/SbOaLzufkOYD/UkZyWg/VGs/fOBwefmYNAg?v=422aa1c9-e5a4-2428-2fc0-6f9e28f45435106ms86ms8ms3rd
https://cdn.cookielaw.org/scripttemplates/202408.1.0/otBannerSdk.js71ms49ms10ms3rd
D
JS Bundles
Action
47 scripts, 438 KB unused
FIX
47 scripts, 438 KB unused
Warning::
https://www.aircanada.com/home/vendor.436b440afc06...: 110 KB unused (33%)
Consider code splitting or tree shaking to reduce unused code.
Warning::
https://cdn.cookielaw.org/scripttemplates/202408.1...: 59 KB unused (54%)
Consider code splitting or tree shaking to reduce unused code.
Warning::
https://www.aircanada.com/home/main.d033cf8802380e...: 48 KB unused (24%)
Consider code splitting or tree shaking to reduce unused code.
Warning::
https://www.aircanada.com/6jkv/xGJ0/jfQ_/WDDX/sw/Y...: 39 KB unused (21%)
Consider code splitting or tree shaking to reduce unused code.
Warning::
https://www.aircanada.com/6jkv/xGJ0/jfQ_/WDDX/sw/Y...: 39 KB unused (21%)
Consider code splitting or tree shaking to reduce unused code.
Info::
Total unused JavaScript: 438 KB
438 KB unused JavaScript

Downloaded but never executed on this page.

ScriptSizeUnusedMinifiedParty
https://www.aircanada.com/home/vendor.436b440afc06d651.js329 KB110 KB (33%)✓3rd
https://cdn.cookielaw.org/scripttemplates/202408.1.0/otBannerSdk.js110 KB59 KB (54%)✓3rd
https://www.aircanada.com/home/main.d033cf8802380eb9.js201 KB48 KB (24%)✓3rd
https://www.aircanada.com/6jkv/xGJ0/jfQ_/WDDX/sw/Y7OaLzwrkOJzpNXE5S/EltsWg/dQd/0ewtKPG0B185 KB39 KB (21%)✓3rd
https://www.aircanada.com/6jkv/xGJ0/jfQ_/WDDX/sw/Y7OaLzwrkOJzpNXE5S/EltsWg/dQd/0ewtKPG0B185 KB39 KB (21%)✓3rd
https://s.go-mpulse.net/boomerang/95K7G-R6KA6-85CWB-9YW8G-QLP3N56 KB37 KB (65%)✓3rd
https://www.aircanada.com/6jkv/xGJ0/jfQ_/WDDX/sw/SbOaLzufkOYD/UkZyWg/VGs/fOBwefmYNAg?v=422aa1c9-e5a4-2428-2fc0-6f9e28f45435154 KB29 KB (19%)✓3rd
https://www.aircanada.com/6jkv/xGJ0/jfQ_/WDDX/sw/SbOaLzufkOYD/UkZyWg/VGs/fOBwefmYNAg?v=422aa1c9-e5a4-2428-2fc0-6f9e28f45435&t=890059154 KB29 KB (19%)✓3rd
https://assets.adobedtm.com/14307738146c/2d72065f81e7/launch-9e3b3ffc9904.min.js96 KB28 KB (29%)✓3rd
https://www.aircanada.com/home/867.5c6ecab26fe17306.js59 KB20 KB (35%)✓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
104 resources · 3.4 MB · 438 KB savings available
FIX
104 resources · 3.4 MB · 438 KB savings available
Warning::
Page weight 2.4 MB over 1MB target
Got: 3.4 MB Expected: ≤ 1 MB
Info::
~438 KB of savings available
Warning::
102 third-party resources (100% of weight)
Info::
3 resources over 200KB
104 resources · 3.4 MiB · 102 third-party 2.4 MiB over 1MB target
JavaScript 52% · 1.8 MiB
Image 33% · 1.1 MiB
Other 8% · 265.2 KiB
Font 6% · 211.1 KiB
CSS 0% · 16.2 KiB
Document 0% · 14.9 KiB

~437.5 KiB of savings available

Remove unused JavaScript: 437.5 KiB
D
HTTP Caching
Action
no-store (uncacheable)
FIX
no-store (uncacheable)
Info::
Cache-Control: no-store prevents all caching
Intentional for dynamic content, but increases server load for every page view.
Got: max-age=0, no-cache, no-store
Info::
No ETag or Last-Modified header
Conditional requests (304 Not Modified) are not possible without validators.
Cache-Control

max-age=0, no-cache, no-store

DirectiveValueMeaning
max-age0Cache for 0 seconds
no-cache—Cache but always revalidate first
no-store—Never cache this response
C
Image Optimization
Action
13 images, 0 KB saveable
REVIEW
13 images, 0 KB saveable
Warning::
https://kilo-content.aircanada.com/ac/applications... is missing width/height — may cause layout shift
Set explicit width and height to prevent CLS.
Warning::
https://kilo-content.aircanada.com/ac/applications... is missing width/height — may cause layout shift
Set explicit width and height to prevent CLS.
13 images 1.1 MB
0 oversized -0 KB
13 legacy format
2 missing dimensions CLS risk

Set explicit width and height to prevent CLS.

Why this matters

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.

Why this matters

Image without explicit width/height — browser can't reserve space; CLS jumps when image loads.

Source: web.dev / Core Web Vitals

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
13 fonts (211 KB)
PASS
13 fonts (211 KB)
Info::
13 font(s) use font-display: swap (FOUT risk but functional)

Web fonts

13

211 KB total

Render-blocking

0

of 13

Dominant font-display

swap

Most common across fonts

Font loading timeline
Transfer FOIT (block) FOUT (swap)
0 ms 1.0 s 2.0 s 3.0 s 4.0 s 5.0 s 6.0 s 7.0 s FCP 1.6 s LCP 3.3 shttps://www.aircanada.com/home/assets/font/ac-nord/AC_Nord_Text-Heavy.woff2AC_Nord_Text-Heavy.woff2 https://www.aircanada.com/home/assets/font/ac-nord/AC_Nord_Text-Heavy.woff2 — 28.9 KiB — 65 ms — font-display: swaphttps://www.aircanada.com/home/assets/font/ac-nord/AC_Nord_Text-Heavy.woff2AC_Nord_Text-Heavy.woff2 https://www.aircanada.com/home/assets/font/ac-nord/AC_Nord_Text-Heavy.woff2 — 28.9 KiB — 67 ms — font-display: swaphttps://www.aircanada.com/home/assets/font/ac-nord/AC_Nord_Text-Regular.woff2AC_Nord_Text-Regular.woff2 https://www.aircanada.com/home/assets/font/ac-nord/AC_Nord_Text-Regular.woff2 — 29.1 KiB — 87 ms — font-display: swaphttps://www.aircanada.com/home/assets/font/ac-nord/AC_Nord_Text-Bold.woff2AC_Nord_Text-Bold.woff2 https://www.aircanada.com/home/assets/font/ac-nord/AC_Nord_Text-Bold.woff2 — 28.9 KiB — 104 ms — font-display: swaphttps://www.aircanada.com/assets/font/ac-nord/AC_Nord_Text-Bold.woff2AC_Nord_Text-Bold.woff2 https://www.aircanada.com/assets/font/ac-nord/AC_Nord_Text-Bold.woff2 — 5.3 KiB — 361 ms — font-display: swaphttps://www.aircanada.com/assets/font/ac-nord/AC_Nord_Text-Regular.woff2AC_Nord_Text-Regular.woff2 https://www.aircanada.com/assets/font/ac-nord/AC_Nord_Text-Regular.woff2 — 5.3 KiB — 432 ms — font-display: swaphttps://www.aircanada.com/assets/font/ac-nord/AC_Nord_Text-Bold.woff2AC_Nord_Text-Bold.woff2 https://www.aircanada.com/assets/font/ac-nord/AC_Nord_Text-Bold.woff2 — 5.3 KiB — 173 ms — font-display: swaphttps://www.aircanada.com/assets/font/ac-nord/AC_Nord_Text-Bold.woff2AC_Nord_Text-Bold.woff2 https://www.aircanada.com/assets/font/ac-nord/AC_Nord_Text-Bold.woff2 — 5.3 KiB — 165 ms — font-display: swaphttps://www.aircanada.com/home/assets/font/ac-nord/AC_Nord_Text-Bold.woff2AC_Nord_Text-Bold.woff2 https://www.aircanada.com/home/assets/font/ac-nord/AC_Nord_Text-Bold.woff2 — 28.9 KiB — 93 ms — font-display: swaphttps://www.aircanada.com/assets/font/ac-nord/AC_Nord_Text-Regular.woff2AC_Nord_Text-Regular.woff2 https://www.aircanada.com/assets/font/ac-nord/AC_Nord_Text-Regular.woff2 — 5.3 KiB — 358 ms — font-display: swaphttps://www.aircanada.com/assets/font/ac-nord/AC_Nord_Text-Regular.woff2AC_Nord_Text-Regular.woff2 https://www.aircanada.com/assets/font/ac-nord/AC_Nord_Text-Regular.woff2 — 5.3 KiB — 373 ms — font-display: swaphttps://www.aircanada.com/assets/font/ac-nord/AC_Nord_Text-Regular.woff2AC_Nord_Text-Regular.woff2 https://www.aircanada.com/assets/font/ac-nord/AC_Nord_Text-Regular.woff2 — 5.3 KiB — 177 ms — font-display: swaphttps://www.aircanada.com/home/assets/font/ac-nord/AC_Nord_Text-Regular.woff2AC_Nord_Text-Regular.woff2 https://www.aircanada.com/home/assets/font/ac-nord/AC_Nord_Text-Regular.woff2 — 29.1 KiB — 86 ms — font-display: swap
AC_Nord_Text-Heavy.woff2 woff2 swap
Size 29 KB
Load time 65 ms
Start 214 ms
Risk FOUT — text flashes from fallback to web font
AC_Nord_Text-Heavy.woff2 woff2 swap
Size 29 KB
Load time 67 ms
Start 3.7 s
Risk FOUT — text flashes from fallback to web font
AC_Nord_Text-Regular.woff2 woff2 swap
Size 29 KB
Load time 87 ms
Start 3.7 s
Risk FOUT — text flashes from fallback to web font
AC_Nord_Text-Bold.woff2 woff2 swap
Size 29 KB
Load time 104 ms
Start 3.7 s
Risk FOUT — text flashes from fallback to web font
AC_Nord_Text-Bold.woff2 woff2 swap
Size 5 KB
Load time 361 ms
Start 4.9 s
Risk FOUT — text flashes from fallback to web font
AC_Nord_Text-Regular.woff2 woff2 swap
Size 5 KB
Load time 432 ms
Start 5.8 s
Risk FOUT — text flashes from fallback to web font
AC_Nord_Text-Bold.woff2 woff2 swap
Size 5 KB
Load time 173 ms
Start 5.8 s
Risk FOUT — text flashes from fallback to web font
AC_Nord_Text-Bold.woff2 woff2 swap
Size 5 KB
Load time 165 ms
Start 6.0 s
Risk FOUT — text flashes from fallback to web font
AC_Nord_Text-Bold.woff2 woff2 swap
Size 29 KB
Load time 93 ms
Start 6.2 s
Risk FOUT — text flashes from fallback to web font
AC_Nord_Text-Regular.woff2 woff2 swap
Size 5 KB
Load time 358 ms
Start 6.3 s
Risk FOUT — text flashes from fallback to web font
AC_Nord_Text-Regular.woff2 woff2 swap
Size 5 KB
Load time 373 ms
Start 6.6 s
Risk FOUT — text flashes from fallback to web font
AC_Nord_Text-Regular.woff2 woff2 swap
Size 5 KB
Load time 177 ms
Start 7.0 s
Risk FOUT — text flashes from fallback to web font
AC_Nord_Text-Regular.woff2 woff2 swap
Size 29 KB
Load time 86 ms
Start 7.2 s
Risk FOUT — text flashes from fallback to web font
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 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
104 requests over 8507ms
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 FCP 1.6 s LCP 3.3 shttps://aircanada.com// https://aircanada.com/ — 301 — 1.6 KiB — 50 ms — h2https://aircanada.com/home/es/es/aco/flights/home/es/es/aco/flights https://aircanada.com/home/es/es/aco/flights — 301 — 1017 B — 33 ms — h2https://www.aircanada.com/home/es/es/aco/flightswww.aircanada.com/home/es/es/aco/fl... https://www.aircanada.com/home/es/es/aco/flights — 200 — 3.8 KiB — 124 ms — h2https://www.aircanada.com/home/assets/font/ac-nord/AC_Nord_Text-Heavy.woff2www.aircanada.com/home/assets/font/... https://www.aircanada.com/home/assets/font/ac-nord/AC_Nord_Text-Heavy.woff2 — 200 — 28.9 KiB — 65 ms — h2https://www.aircanada.com/6jkv/xGJ0/jfQ_/WDDX/sw/SbOaLzufkOYD/UkZyWg/VGs/fOBwefmYNAg?v=422aa1c9-e5a4-2428-2fc0-6f9e28f45435&t=890059www.aircanada.com/6jkv/xGJ0/jfQ_/WD... https://www.aircanada.com/6jkv/xGJ0/jfQ_/WDDX/sw/SbOaLzufkOYD/UkZyWg/VGs/fOBwefmYNAg?v=422aa1c9-e5a4-2428-2fc0-6f9e28f45435&t=890059 — 200 — 153.5 KiB — 43 ms — h2https://www.aircanada.com/6jkv/xGJ0/jfQ_/WDDX/sw/Y7OaLzwrkOJzpNXE5S/EltsWg/dQd/0ewtKPG0Bwww.aircanada.com/6jkv/xGJ0/jfQ_/WD... https://www.aircanada.com/6jkv/xGJ0/jfQ_/WDDX/sw/Y7OaLzwrkOJzpNXE5S/EltsWg/dQd/0ewtKPG0B — 200 — 184.7 KiB — 44 ms — h2https://www.aircanada.com/6jkv/xGJ0/jfQ_/WDDX/sw/Y7OaLzwrkOJzpNXE5S/EltsWg/dQd/0ewtKPG0Bwww.aircanada.com/6jkv/xGJ0/jfQ_/WD... https://www.aircanada.com/6jkv/xGJ0/jfQ_/WDDX/sw/Y7OaLzwrkOJzpNXE5S/EltsWg/dQd/0ewtKPG0B — 201 — 1.5 KiB — 264 ms — h2https://www.aircanada.com/favicon.icowww.aircanada.com/favicon.ico https://www.aircanada.com/favicon.ico — 200 — 3.7 KiB — 22 ms — h2blob:https://www.aircanada.com/6d33e6f7-f285-4f93-94bf-aa0ba689b1f0www.aircanada.com/6d33e6f7-f285-4f9... blob:https://www.aircanada.com/6d33e6f7-f285-4f93-94bf-aa0ba689b1f0 — -1 — 0 B — 0 ms — blob:https://www.aircanada.com/fd7a7190-68ce-4107-9501-d54a1764d87dwww.aircanada.com/fd7a7190-68ce-410... blob:https://www.aircanada.com/fd7a7190-68ce-4107-9501-d54a1764d87d — -1 — 0 B — 0 ms — https://www.aircanada.com/6jkv/xGJ0/jfQ_/WDDX/sw/Y7OaLzwrkOJzpNXE5S/EltsWg/dQd/0ewtKPG0Bwww.aircanada.com/6jkv/xGJ0/jfQ_/WD... https://www.aircanada.com/6jkv/xGJ0/jfQ_/WDDX/sw/Y7OaLzwrkOJzpNXE5S/EltsWg/dQd/0ewtKPG0B — 201 — 1.6 KiB — 236 ms — h2https://www.aircanada.com/6jkv/xGJ0/jfQ_/WDDX/sw/SbOaLzufkOYD/UkZyWg/VGs/fOBwefmYNAg?t=890059www.aircanada.com/6jkv/xGJ0/jfQ_/WD... https://www.aircanada.com/6jkv/xGJ0/jfQ_/WDDX/sw/SbOaLzufkOYD/UkZyWg/VGs/fOBwefmYNAg?t=890059 — 200 — 1.2 KiB — 73 ms — h2https://www.aircanada.com/home/es/es/aco/flightswww.aircanada.com/home/es/es/aco/fl... https://www.aircanada.com/home/es/es/aco/flights — 200 — 11.2 KiB — 365 ms — h2https://www.aircanada.com/home/assets/font/ac-nord/AC_Nord_Text-Heavy.woff2www.aircanada.com/home/assets/font/... https://www.aircanada.com/home/assets/font/ac-nord/AC_Nord_Text-Heavy.woff2 — 200 — 28.9 KiB — 67 ms — h2https://www.aircanada.com/assets/b23d8f289e32edec2065f3c335af8c367001194a011www.aircanada.com/assets/b23d8f289e... https://www.aircanada.com/assets/b23d8f289e32edec2065f3c335af8c367001194a011 — 200 — 62.4 KiB — 69 ms — h2https://www.aircanada.com/home/assets/font/ac-nord/AC_Nord_Text-Regular.woff2www.aircanada.com/home/assets/font/... https://www.aircanada.com/home/assets/font/ac-nord/AC_Nord_Text-Regular.woff2 — 200 — 29.1 KiB — 87 ms — h2https://www.aircanada.com/home/assets/font/ac-nord/AC_Nord_Text-Bold.woff2www.aircanada.com/home/assets/font/... https://www.aircanada.com/home/assets/font/ac-nord/AC_Nord_Text-Bold.woff2 — 200 — 28.9 KiB — 104 ms — h2https://www.aircanada.com/home/runtime.453919a8577c3fd2.jswww.aircanada.com/home/runtime.4539... https://www.aircanada.com/home/runtime.453919a8577c3fd2.js — 200 — 2.7 KiB — 61 ms — h2https://www.aircanada.com/home/polyfills.da2356291a9cd820.jswww.aircanada.com/home/polyfills.da... 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— 57 ms — h2https://p11.techlab-cdn.com/e/65226_747628217.jsp11.techlab-cdn.com/e/65226_7476282... https://p11.techlab-cdn.com/e/65226_747628217.js — 200 — 32.7 KiB — 59 ms — h2https://www.aircanada.com/home/styles.8dc6e083c14ad84a.csswww.aircanada.com/home/styles.8dc6e... https://www.aircanada.com/home/styles.8dc6e083c14ad84a.css — 200 — 11.9 KiB — 27 ms — h2
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— h2https://www.aircanada.com/6jkv/xGJ0/jfQ_/WDDX/sw/Y7OaLzwrkOJzpNXE5S/EltsWg/dQd/0ewtKPG0Bwww.aircanada.com/6jkv/xGJ0/jfQ_/WD... https://www.aircanada.com/6jkv/xGJ0/jfQ_/WDDX/sw/Y7OaLzwrkOJzpNXE5S/EltsWg/dQd/0ewtKPG0B — 200 — 184.7 KiB — 44 ms — h2https://www.aircanada.com/6jkv/xGJ0/jfQ_/WDDX/sw/Y7OaLzwrkOJzpNXE5S/EltsWg/dQd/0ewtKPG0Bwww.aircanada.com/6jkv/xGJ0/jfQ_/WD... https://www.aircanada.com/6jkv/xGJ0/jfQ_/WDDX/sw/Y7OaLzwrkOJzpNXE5S/EltsWg/dQd/0ewtKPG0B — 201 — 1.5 KiB — 264 ms — h2https://www.aircanada.com/favicon.icowww.aircanada.com/favicon.ico https://www.aircanada.com/favicon.ico — 200 — 3.7 KiB — 22 ms — h2blob:https://www.aircanada.com/6d33e6f7-f285-4f93-94bf-aa0ba689b1f0www.aircanada.com/6d33e6f7-f285-4f9... blob:https://www.aircanada.com/6d33e6f7-f285-4f93-94bf-aa0ba689b1f0 — -1 — 0 B — 0 ms — blob:https://www.aircanada.com/fd7a7190-68ce-4107-9501-d54a1764d87dwww.aircanada.com/fd7a7190-68ce-410... blob:https://www.aircanada.com/fd7a7190-68ce-4107-9501-d54a1764d87d — -1 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— 57 ms — h2https://p11.techlab-cdn.com/e/65226_747628217.jsp11.techlab-cdn.com/e/65226_7476282... https://p11.techlab-cdn.com/e/65226_747628217.js — 200 — 32.7 KiB — 59 ms — h2https://www.aircanada.com/home/styles.8dc6e083c14ad84a.csswww.aircanada.com/home/styles.8dc6e... https://www.aircanada.com/home/styles.8dc6e083c14ad84a.css — 200 — 11.9 KiB — 27 ms — h2https://www.aircanada.com/6jkv/xGJ0/jfQ_/WDDX/sw/Y7OaLzwrkOJzpNXE5S/EltsWg/dQd/0ewtKPG0Bwww.aircanada.com/6jkv/xGJ0/jfQ_/WD... https://www.aircanada.com/6jkv/xGJ0/jfQ_/WDDX/sw/Y7OaLzwrkOJzpNXE5S/EltsWg/dQd/0ewtKPG0B — 201 — 1.6 KiB — 204 ms — h2https://kilo-content.aircanada.com/ac/applications/achomebeta/info.json?t=1776294243912kilo-content.aircanada.com/ac/appli... https://kilo-content.aircanada.com/ac/applications/achomebeta/info.json?t=1776294243912 — 200 — 1.2 KiB — 435 ms — h2https://www.aircanada.com/home/favicon.icowww.aircanada.com/home/favicon.ico https://www.aircanada.com/home/favicon.ico — 200 — 2.9 KiB — 24 ms — h2https://c.go-mpulse.net/api/config.json?key=95K7G-R6KA6-85CWB-9YW8G-QLP3N&d=www.aircanada.com&t=5920981&v=1.720.0&if=&sl=0&si=b4571b72-97bd-432c-a27b-462e53ca3f66-tdk5er&plugins=AK,ConfigOverride,Continuity,PageParams,IFrameDelay,AutoXHR,SPA,History,Angular,Backbone,Ember,RT,CrossDomain,BW,PaintTiming,NavigationTiming,ResourceTiming,Memory,CACHE_RELOAD,Errors,TPAnalytics,UserTiming,Akamai,Early,EventTiming,LOGN&acao=&ak.ai=329127c.go-mpulse.net/api/config.json?key... https://c.go-mpulse.net/api/config.json?key=95K7G-R6KA6-85CWB-9YW8G-QLP3N&d=www.aircanada.com&t=5920981&v=1.720.0&if=&sl=0&si=b4571b72-97bd-432c-a27b-462e53ca3f66-tdk5er&plugins=AK,ConfigOverride,Continuity,PageParams,IFrameDelay,AutoXHR,SPA,History,Angular,Backbone,Ember,RT,CrossDomain,BW,PaintTiming,NavigationTiming,ResourceTiming,Memory,CACHE_RELOAD,Errors,TPAnalytics,UserTiming,Akamai,Early,EventTiming,LOGN&acao=&ak.ai=329127 — 200 — 214 B — 289 ms — h2https://kilo-content.aircanada.com/ac/applications/achomebeta/content/1.0.2140/assets/json/aco/config/achome.jsonkilo-content.aircanada.com/ac/appli... https://kilo-content.aircanada.com/ac/applications/achomebeta/content/1.0.2140/assets/json/aco/config/achome.json — 200 — 13.9 KiB — 56 ms — h2https://kilo-content.aircanada.com/ac/applications/achomebeta/content/1.0.2140/assets/json/aco/frequent-updates/es-ES.jsonkilo-content.aircanada.com/ac/appli... https://kilo-content.aircanada.com/ac/applications/achomebeta/content/1.0.2140/assets/json/aco/frequent-updates/es-ES.json — 200 — 4.8 KiB — 61 ms — h2https://kilo-content.aircanada.com/ac/applications/achomebeta/content/1.0.2140/assets/json/app-config.jsonkilo-content.aircanada.com/ac/appli... https://kilo-content.aircanada.com/ac/applications/achomebeta/content/1.0.2140/assets/json/app-config.json — 200 — 1.8 KiB — 84 ms — h2https://kilo-content.aircanada.com/ac/applications/achomebeta/content/1.0.2140/es-ES.jsonkilo-content.aircanada.com/ac/appli... https://kilo-content.aircanada.com/ac/applications/achomebeta/content/1.0.2140/es-ES.json — 200 — 111.5 KiB — 128 ms — h2blob:https://www.aircanada.com/78c842dd-a5ea-4cc3-ac7e-2d25bce09c8ewww.aircanada.com/78c842dd-a5ea-4cc... blob:https://www.aircanada.com/78c842dd-a5ea-4cc3-ac7e-2d25bce09c8e — 200 — -1 B — 134 ms — blobhttps://www.aircanada.com/home/124.83811dadc72a01ce.jswww.aircanada.com/home/124.83811dad... https://www.aircanada.com/home/124.83811dadc72a01ce.js — 200 — 5.3 KiB — 24 ms — h2https://www.aircanada.com/home/926.ce90fc4e3a1c539b.jswww.aircanada.com/home/926.ce90fc4e... https://www.aircanada.com/home/926.ce90fc4e3a1c539b.js — 200 — 9.6 KiB — 44 ms — h2https://www.aircanada.com/home/298.70b89edf9b45d9c6.jswww.aircanada.com/home/298.70b89edf... https://www.aircanada.com/home/298.70b89edf9b45d9c6.js — 200 — 24.4 KiB — 50 ms — 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https://assets.adobedtm.com/14307738146c/2d72065f81e7/launch-9e3b3ffc9904.min.js — 200 — 96.4 KiB — 48 ms — h2https://www.aircanada.com/home/common.a3f77af452d198f5.jswww.aircanada.com/home/common.a3f77... https://www.aircanada.com/home/common.a3f77af452d198f5.js — 200 — 4.1 KiB — 76 ms — h2https://www.aircanada.com/home/331.6d01cd94d534631d.jswww.aircanada.com/home/331.6d01cd94... https://www.aircanada.com/home/331.6d01cd94d534631d.js — 200 — 4.1 KiB — 69 ms — h2https://www.aircanada.com/home/770.93ff7e19627a0a47.jswww.aircanada.com/home/770.93ff7e19... https://www.aircanada.com/home/770.93ff7e19627a0a47.js — 200 — 4.7 KiB — 55 ms — h2https://www.aircanada.com/home/940.6c18e3c0aed3e563.jswww.aircanada.com/home/940.6c18e3c0... https://www.aircanada.com/home/940.6c18e3c0aed3e563.js — 200 — 2.9 KiB — 55 ms — h2https://www.aircanada.com/home/695.25262becbe9f7ae5.jswww.aircanada.com/home/695.25262bec... https://www.aircanada.com/home/695.25262becbe9f7ae5.js — 200 — 1.5 KiB — 52 ms — h2https://www.aircanada.com/home/850.0291fa2ce6ad5b83.jswww.aircanada.com/home/850.0291fa2c... https://www.aircanada.com/home/850.0291fa2ce6ad5b83.js — 200 — 5.1 KiB — 27 ms — h2https://www.aircanada.com/cityList/esBookable.json.gzwww.aircanada.com/cityList/esBookab... https://www.aircanada.com/cityList/esBookable.json.gz — 200 — 57.4 KiB — 32 ms — h2https://adobedc.demdex.net/ee/v1/privacy/set-consent?configId=c4f9ab76-a838-4e48-a5c1-4ca90e42f45e&requestId=1754f635-3051-40dd-94b7-dd7fc112e75eadobedc.demdex.net/ee/v1/privacy/se... https://adobedc.demdex.net/ee/v1/privacy/set-consent?configId=c4f9ab76-a838-4e48-a5c1-4ca90e42f45e&requestId=1754f635-3051-40dd-94b7-dd7fc112e75e — 200 — 1019 B — 80 ms — h2https://kilo-content.aircanada.com/ac/applications/achomebeta/content/1.0.2140/assets/json/aco/site-edition-country.jsonkilo-content.aircanada.com/ac/appli... https://kilo-content.aircanada.com/ac/applications/achomebeta/content/1.0.2140/assets/json/aco/site-edition-country.json — 200 — 3.0 KiB — 64 ms — h2blob:https://www.aircanada.com/e8202b42-ae7b-401d-bd95-d5e6f5a20f13www.aircanada.com/e8202b42-ae7b-401... blob:https://www.aircanada.com/e8202b42-ae7b-401d-bd95-d5e6f5a20f13 — -1 — 0 B — 0 ms — https://kilo-content.aircanada.com/ac/applications/achomebeta/content/1.0.2140/assets/json/aco/cyber-monday-black-friday/es-ES.jsonkilo-content.aircanada.com/ac/appli... https://kilo-content.aircanada.com/ac/applications/achomebeta/content/1.0.2140/assets/json/aco/cyber-monday-black-friday/es-ES.json — 403 — 1.8 KiB — 380 ms — h2https://www.aircanada.com/cityList/esBookable.json.gzwww.aircanada.com/cityList/esBookab... https://www.aircanada.com/cityList/esBookable.json.gz — 200 — 0 B — 2 ms — h2https://kilo-content.aircanada.com/ac/applications/achomebeta/content/1.0.2140/assets/img/page-banner/max-desktop/flights.webpkilo-content.aircanada.com/ac/appli... https://kilo-content.aircanada.com/ac/applications/achomebeta/content/1.0.2140/assets/img/page-banner/max-desktop/flights.webp — 200 — 363.4 KiB — 31 ms — h2https://kilo-content.aircanada.com/ac/applications/achomebeta/content/1.0.2140/assets/img/logos/aeroplan/dark-aeroplan-logo.svgkilo-content.aircanada.com/ac/appli... https://kilo-content.aircanada.com/ac/applications/achomebeta/content/1.0.2140/assets/img/logos/aeroplan/dark-aeroplan-logo.svg — 200 — 862 B — 21 ms — h2https://kilo-content.aircanada.com/ac/applications/achomebeta/content/1.0.2140/assets/img/pos-banner/always-on-fcb-lg.jpgkilo-content.aircanada.com/ac/appli... https://kilo-content.aircanada.com/ac/applications/achomebeta/content/1.0.2140/assets/img/pos-banner/always-on-fcb-lg.jpg — 200 — 158.8 KiB — 48 ms — h2https://kilo-content.aircanada.com/ac/applications/achomebeta/content/1.0.2140/assets/img/globe-3d/3d_globe_desktop.svgkilo-content.aircanada.com/ac/appli... https://kilo-content.aircanada.com/ac/applications/achomebeta/content/1.0.2140/assets/img/globe-3d/3d_globe_desktop.svg — 200 — 50.0 KiB — 46 ms — h2https://kilo-content.aircanada.com/ac/applications/achomebeta/content/1.0.2140/assets/img/new-to-ac/san-fran_pos-emeia-discoover.webpkilo-content.aircanada.com/ac/appli... https://kilo-content.aircanada.com/ac/applications/achomebeta/content/1.0.2140/assets/img/new-to-ac/san-fran_pos-emeia-discoover.webp — 200 — 69.0 KiB — 44 ms — h2https://kilo-content.aircanada.com/ac/applications/achomebeta/content/1.0.2140/assets/img/new-to-ac/world-cup-discover-tile.webpkilo-content.aircanada.com/ac/appli... https://kilo-content.aircanada.com/ac/applications/achomebeta/content/1.0.2140/assets/img/new-to-ac/world-cup-discover-tile.webp — 200 — 49.8 KiB — 62 ms — h2https://kilo-content.aircanada.com/ac/applications/achomebeta/content/1.0.2140/assets/img/new-to-ac/sig-class-new-to-ac.webpkilo-content.aircanada.com/ac/appli... https://kilo-content.aircanada.com/ac/applications/achomebeta/content/1.0.2140/assets/img/new-to-ac/sig-class-new-to-ac.webp — 200 — 7.3 KiB — 58 ms — h2https://kilo-content.aircanada.com/ac/applications/achomebeta/content/1.0.2140/assets/img/news-and-updates/desktop.pngkilo-content.aircanada.com/ac/appli... https://kilo-content.aircanada.com/ac/applications/achomebeta/content/1.0.2140/assets/img/news-and-updates/desktop.png — 200 — 191.7 KiB — 66 ms — h2https://www.aircanada.com/assets/font/ac-nord/AC_Nord_Text-Regular.woff2www.aircanada.com/assets/font/ac-no... https://www.aircanada.com/assets/font/ac-nord/AC_Nord_Text-Regular.woff2 — 200 — 5.3 KiB — 432 ms — h2https://kilo-content.aircanada.com/ac/applications/achomebeta/content/1.0.2140/assets/img/logos/star-alliance/ac_star_en_rgb_hor-no-celebration.svgkilo-content.aircanada.com/ac/appli... https://kilo-content.aircanada.com/ac/applications/achomebeta/content/1.0.2140/assets/img/logos/star-alliance/ac_star_en_rgb_hor-no-celebration.svg — 200 — 3.5 KiB — 29 ms — h2https://kilo-content.aircanada.com/ac/applications/achomebeta/content/1.0.2140/assets/img/logos/skytrax/skytrax-2025-en.svgkilo-content.aircanada.com/ac/appli... https://kilo-content.aircanada.com/ac/applications/achomebeta/content/1.0.2140/assets/img/logos/skytrax/skytrax-2025-en.svg — 200 — 177.3 KiB — 36 ms — h2https://www.aircanada.com/assets/font/ac-nord/AC_Nord_Text-Bold.woff2www.aircanada.com/assets/font/ac-no... https://www.aircanada.com/assets/font/ac-nord/AC_Nord_Text-Bold.woff2 — 200 — 5.3 KiB — 173 ms — h2blob:https://www.aircanada.com/707df3ae-7b1a-47b6-b5ad-d5217f000430www.aircanada.com/707df3ae-7b1a-47b... blob:https://www.aircanada.com/707df3ae-7b1a-47b6-b5ad-d5217f000430 — -1 — 0 B — 0 ms — https://www.aircanada.com/assets/font/ac-nord/AC_Nord_Text-Bold.woff2www.aircanada.com/assets/font/ac-no... https://www.aircanada.com/assets/font/ac-nord/AC_Nord_Text-Bold.woff2 — 200 — 5.3 KiB — 165 ms — h2https://www.aircanada.com/6jkv/xGJ0/jfQ_/WDDX/sw/Y7OaLzwrkOJzpNXE5S/EltsWg/dQd/0ewtKPG0Bwww.aircanada.com/6jkv/xGJ0/jfQ_/WD... https://www.aircanada.com/6jkv/xGJ0/jfQ_/WDDX/sw/Y7OaLzwrkOJzpNXE5S/EltsWg/dQd/0ewtKPG0B — 201 — 1.5 KiB — 213 ms — h2https://www.aircanada.com/home/assets/font/ac-nord/AC_Nord_Text-Bold.woff2www.aircanada.com/home/assets/font/... https://www.aircanada.com/home/assets/font/ac-nord/AC_Nord_Text-Bold.woff2 — 200 — 28.9 KiB — 93 ms — h2https://www.aircanada.com/assets/font/ac-nord/AC_Nord_Text-Regular.woff2www.aircanada.com/assets/font/ac-no... https://www.aircanada.com/assets/font/ac-nord/AC_Nord_Text-Regular.woff2 — 200 — 5.3 KiB — 358 ms — h2https://kilo-content.aircanada.com/ac/applications/achomebeta/content/1.0.2140/assets/img/country-flags/fflag-sprite.pngkilo-content.aircanada.com/ac/appli... https://kilo-content.aircanada.com/ac/applications/achomebeta/content/1.0.2140/assets/img/country-flags/fflag-sprite.png — 200 — 36.5 KiB — 26 ms — h2https://www.aircanada.com/assets/font/ac-nord/AC_Nord_Text-Regular.woff2www.aircanada.com/assets/font/ac-no... https://www.aircanada.com/assets/font/ac-nord/AC_Nord_Text-Regular.woff2 — 200 — 5.3 KiB — 373 ms — h2https://www.aircanada.com/assets/font/ac-nord/AC_Nord_Text-Regular.woff2www.aircanada.com/assets/font/ac-no... https://www.aircanada.com/assets/font/ac-nord/AC_Nord_Text-Regular.woff2 — 200 — 5.3 KiB — 177 ms — h2https://assets.adobedtm.com/14307738146c/2d72065f81e7/a20a2f2f98c6/RC6bb2ba695e064cf98fdbf6bd9029d6c1-source.min.jsassets.adobedtm.com/14307738146c/2d... https://assets.adobedtm.com/14307738146c/2d72065f81e7/a20a2f2f98c6/RC6bb2ba695e064cf98fdbf6bd9029d6c1-source.min.js — 200 — 681 B — 3 ms — h2https://cdn.cookielaw.org/scripttemplates/otSDKStub.jscdn.cookielaw.org/scripttemplates/o... 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86 ms — h2https://securepubads.g.doubleclick.net/tag/js/gpt.jssecurepubads.g.doubleclick.net/tag/... https://securepubads.g.doubleclick.net/tag/js/gpt.js — -1 — 0 B — 0 ms — https://www.googletagmanager.com/gtm.js?id=GTM-MHSCXDwww.googletagmanager.com/gtm.js?id=... https://www.googletagmanager.com/gtm.js?id=GTM-MHSCXD — -1 — 0 B — 0 ms —
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 2979ms · 824KB · CA$41/mo
www.aircanada.com
Other
Costly
Execution 1199ms
Transfer 62 KB
Monthly Cost CA$17/mo
www.aircanada.com
Other
Costly
Execution 494ms
Transfer 11 KB
Monthly Cost CA$7/mo
Unattributable
Other
Costly
Execution 317ms
Transfer 0 KB
Monthly Cost CA$4/mo
www.aircanada.com
Other
Costly
Execution 310ms
Transfer 2 KB
Unused 21%
Monthly Cost CA$4/mo
www.aircanada.com
Other
Costly
Execution 231ms
Transfer 154 KB
Unused 19%
Monthly Cost CA$3/mo
www.aircanada.com
Other
Optional
Execution 134ms
Transfer 3 KB
Monthly Cost CA$2/mo
www.aircanada.com
Other
Optional
Execution 118ms
Transfer 329 KB
Unused 33%
Monthly Cost CA$2/mo
www.aircanada.com
Other
Optional
Execution 106ms
Transfer 154 KB
Unused 19%
Monthly Cost CA$1/mo
OneTrust
Consent
Essential
Execution 71ms
Transfer 110 KB
Unused 54%
Monthly Cost CA$1/mo

These scripts may cost more than they're worth

  • www.aircanada.com adds 1199ms and costs ~CA$17/month
  • www.aircanada.com adds 494ms and costs ~CA$7/month
  • Unattributable adds 317ms and costs ~CA$4/month
  • www.aircanada.com adds 310ms and costs ~CA$4/month
  • www.aircanada.com adds 231ms and costs ~CA$3/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

www.aircanada.com takes 1199ms 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.aircanada.com takes 494ms 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

Unattributable takes 317ms 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.aircanada.com takes 310ms 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.aircanada.com takes 231ms 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

54% of OneTrust'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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