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https://www.canada.ca

Performance

· 14 checks — Lighthouse + waterfall + sustainability rolled into one auditable list.
SCORE
89
GRADE
B
FIX
1
REVIEW
4
PASS
7
INFO
2

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

Mobile Desktop
92
Performance Overall performance score (0–100) based on Core Web Vitals and other metrics. 90+ is good.
100
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.
58
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.

1.02 s

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

1.69 s

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

19 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.

1.02 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.

1.69 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
14
7 PASS 4 REVIEW 1 FIX
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.
Info::
Last-Modified header present

No Cache-Control header

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

B
Third-Party Impact
43% third-party, 0 ms blocking
REVIEW
43% third-party, 0 ms blocking
Info::
Third-party code accounts for 43% of page weight (331.5 KiB of 762.7 KiB)
Info::
Third-party blocking time is low (0 ms)
57%
43%
First-party Third-party
C
Image Optimization
Action
10 images, 0 KB saveable
REVIEW
10 images, 0 KB saveable
Warning::
https://www.canada.ca/etc/designs/canada/wet-boew/... is missing width/height — may cause layout shift
Set explicit width and height to prevent CLS.
Warning::
https://www.canada.ca/etc/designs/canada/wet-boew/... is missing width/height — may cause layout shift
Set explicit width and height to prevent CLS.
10 images 212 KB
0 oversized -0 KB
10 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

B
JS Bundles
9 scripts, 143 KB unused
REVIEW
9 scripts, 143 KB unused
Warning::
https://www.canada.ca/etc/designs/canada/wet-boew/...: 59 KB unused (77%)
Consider code splitting or tree shaking to reduce unused code.
Warning::
https://assets.adobedtm.com/be5dfd287373/abb618326...: 45 KB unused (28%)
Consider code splitting or tree shaking to reduce unused code.
Warning::
https://s.go-mpulse.net/boomerang/KBFUZ-C9D7G-RB8S...: 38 KB unused (66%)
Consider code splitting or tree shaking to reduce unused code.
Info::
Total unused JavaScript: 143 KB
143 KB unused JavaScript

Downloaded but never executed on this page.

ScriptSizeUnusedMinifiedParty
https://www.canada.ca/etc/designs/canada/wet-boew/js/wet-boew.min.js78 KB59 KB (77%)✓1st
https://assets.adobedtm.com/be5dfd287373/abb618326704/launch-3eac5e076135.min.js161 KB45 KB (28%)✓3rd
https://s.go-mpulse.net/boomerang/KBFUZ-C9D7G-RB8SX-GRGEN-HGMC958 KB38 KB (66%)✓3rd
https://ajax.googleapis.com/ajax/libs/jquery/2.1.1/jquery.min.js30 KB—✓3rd
https://www.canada.ca/etc/designs/canada/wet-boew/js/theme.min.js17 KB—✓1st
https://assets.adobedtm.com/extensions/EP31dbb9c60e404ba1aa6e746d49be6f29/AppMeasurement.min.js13 KB—✓3rd
https://assets.adobedtm.com/extensions/EP31dbb9c60e404ba1aa6e746d49be6f29/AppMeasurement_Module_ActivityMap.min.js2 KB—✓3rd
https://www.canada.ca/etc/designs/canada/wet-boew/js/i18n/en.min.js7 KB—✓1st
https://www.canada.ca/etc/designs/canada/wet-boew/js/i18n/en.min.js0 KB—✓1st

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

C
Green Hosting
Action
Whether the site is served from green-energy infrastructure
REVIEW

Green Hosting

No green hosting detected

A
Page Weight Budget
763 KB transferred, 34 requests
PASS
763 KB transferred, 34 requests
Info::
Page weighs 2.1 MB (763 KB transferred)
Info::
34 HTTP requests
Info::
Estimated 0.16 g CO2 per page load
763 KB / 2.4 MB budget
763 KB transferred
34 requests
0.16 g CO2 per page load
JavaScript 358.5 KiB 47%
Images 212.4 KiB 28%
CSS 85.2 KiB 11%
Fonts 79.3 KiB 10%
Other 14.8 KiB 2%
HTML 7.5 KiB 1%
Other 5.1 KiB 1%
0 2.4 MB 4.9 MB
Under budget
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+
JS Execution Cost
410ms total JS execution
PASS
410ms total JS execution
Info::
https://assets.adobedtm.com/be5dfd287373/abb618326...: 194ms CPU time
Info::
https://www.canada.ca/: 80ms CPU time
Info::
https://www.canada.ca/etc/designs/canada/wet-boew/...: 72ms CPU time
Info::
Unattributable: 64ms CPU time
Warning::
Third-party scripts: 258ms (63% of total)

Main Thread Breakdown

Script Evaluation 58% Other 18% Style & Layout 9% Script Parsing & Compilation 9% Parse HTML & CSS 4%
ScriptTotalScriptingParse/CompileParty
https://assets.adobedtm.com/be5dfd287373/abb618326704/launch-3eac5e076135.min.js194ms159ms27ms3rd
https://www.canada.ca/80ms29ms1ms1st
https://www.canada.ca/etc/designs/canada/wet-boew/js/wet-boew.min.js72ms51ms8ms1st
Unattributable64ms2ms0ms3rd
A+
Font Loading
4 fonts (79 KB)
PASS
4 fonts (79 KB)
Info::
4 font(s) use font-display: swap (FOUT risk but functional)

Web fonts

4

79 KB total

Render-blocking

0

of 4

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 FCP 1.0 s LCP 1.7 shttps://fonts.gstatic.com/s/lato/v22/S6u9w4BMUTPHh6UVSwiPGQ.woff2S6u9w4BMUTPHh6UVSwiPGQ.... https://fonts.gstatic.com/s/lato/v22/S6u9w4BMUTPHh6UVSwiPGQ.woff2 — 22.5 KiB — 0 ms — font-display: swaphttps://fonts.gstatic.com/s/notosans/v25/o-0IIpQlx3QUlC5A4PNr5TRA.woff2o-0IIpQlx3QUlC5A4PNr5TR... https://fonts.gstatic.com/s/notosans/v25/o-0IIpQlx3QUlC5A4PNr5TRA.woff2 — 15.7 KiB — 0 ms — font-display: swaphttps://fonts.gstatic.com/s/lato/v22/S6uyw4BMUTPHjx4wXg.woff2S6uyw4BMUTPHjx4wXg.woff2 https://fonts.gstatic.com/s/lato/v22/S6uyw4BMUTPHjx4wXg.woff2 — 23.1 KiB — 0 ms — font-display: swaphttps://www.canada.ca/etc/designs/canada/wet-boew/fonts/glyphicons-halflings-regular.woff2glyphicons-halflings-re... https://www.canada.ca/etc/designs/canada/wet-boew/fonts/glyphicons-halflings-regular.woff2 — 18.0 KiB — 0 ms — font-display: swap
S6u9w4BMUTPHh6UVSwiPGQ.... woff2 swap
Size 23 KB
Load time 0 ms
Start 0 ms
Risk FOUT — text flashes from fallback to web font
o-0IIpQlx3QUlC5A4PNr5TR... woff2 swap
Size 16 KB
Load time 0 ms
Start 0 ms
Risk FOUT — text flashes from fallback to web font
S6uyw4BMUTPHjx4wXg.woff2 woff2 swap
Size 23 KB
Load time 0 ms
Start 0 ms
Risk FOUT — text flashes from fallback to web font
glyphicons-halflings-re... woff2 swap
Size 18 KB
Load time 0 ms
Start 0 ms
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
34 requests over 0ms
INFO

Performance analysis not available for this result.

Third-Party Script Cost
Per-script blocking time, transfer cost, and cache headers
INFO
63% of JavaScript execution is third-party
First-party Third-party 258ms · 161KB · CA$4/mo
assets.adobedtm.com
Other
Optional
Execution 194ms
Transfer 161 KB
Unused 28%
Monthly Cost CA$3/mo
Unattributable
Other
Optional
Execution 64ms
Transfer 0 KB
Monthly Cost CA$1/mo

63% of JavaScript execution time comes from third-party scripts.

Why this matters

Third-party scripts (analytics, ads, social, A/B testing) often dominate execution time — every one is a perf-and-privacy tax.

Learn more ▾

Each third-party script is a black box: you don't control when it loads, what it executes, or how much it grows. They often account for a major share of total blocking time on average sites (HTTP Archive's Web Almanac documents the trend). Audit which ones you actually need, defer the rest, and use facade patterns (lite-youtube, lite-vimeo) for embedded media.

Source: web.dev / HTTP Archive Web Almanac

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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