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Performance

· 17 checks — Lighthouse + waterfall + sustainability rolled into one auditable list.
SCORE
82
GRADE
B
FIX
3
REVIEW
5
PASS
7
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.
100
Accessibility Measures how accessible the page is for users with disabilities. Checks color contrast, ARIA labels, and semantic HTML.
100
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.

3.41 s

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

3.41 s

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

341 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.

5.18 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.

9.78 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
17
7 PASS 5 REVIEW 3 FIX
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 (1.4 MiB of 1.4 MiB)
Info::
Third-party blocking time is low (0 ms)
100%
First-party Third-party
D
Page Weight Inventory
Action
59 resources · 1.4 MB · 291 KB savings available
FIX
59 resources · 1.4 MB · 291 KB savings available
Warning::
Page weight 377 KB over 1MB target
Got: 1.4 MB Expected: ≤ 1 MB
Info::
~291 KB of savings available
Warning::
58 third-party resources (100% of weight)
Info::
2 resources over 200KB
59 resources · 1.4 MiB · 58 third-party 376.6 KiB over 1MB target
JavaScript 60% · 844.1 KiB
Image 25% · 354.7 KiB
CSS 9% · 129.4 KiB
Font 3% · 42.2 KiB
Document 2% · 27.7 KiB
Other 0% · 2.5 KiB

~291.2 KiB of savings available

Remove unused JavaScript: 291.2 KiB
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
Page Weight Budget
1.4 MB transferred, 59 requests
REVIEW
1.4 MB transferred, 59 requests
Info::
Page weighs 4.1 MB (1.4 MB transferred)
Warning::
JavaScript is 844 KB — consider code splitting or lazy loading
Large JavaScript bundles delay interactivity. Split code by route or defer non-critical scripts.
Got: 844 KB
Info::
59 HTTP requests
Info::
Estimated 0.29 g CO2 per page load
1.4 MB / 2.4 MB budget
1.4 MB transferred
59 requests
0.29 g CO2 per page load
JavaScript 844.1 KiB 60%
Images 333.0 KiB 24%
CSS 129.4 KiB 9%
Fonts 42.2 KiB 3%
HTML 27.5 KiB 2%
Other 21.9 KiB 2%
Other 1.1 KiB 0%
Other 942 B 0%
Other 548 B 0%
0 2.4 MB 4.9 MB
Under 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

B
Image Optimization
4 images, 0 KB saveable
REVIEW
4 images, 0 KB saveable
Warning::
https://www.ontario.ca/themes/ontario_2021/assets/... is missing width/height — may cause layout shift
Set explicit width and height to prevent CLS.
4 images 333 KB
0 oversized -0 KB
4 legacy format
1 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

C
JS Execution Cost
Action
1504ms total JS execution
REVIEW
1504ms total JS execution
Warning::
https://www.ontario.ca/18f5227b-e27b-445a-a53f-f84...: 345ms CPU time
Warning::
https://www.ontario.ca/libraries/ontario-search-au...: 299ms CPU time
Warning::
https://www.googletagmanager.com/gtag/js?id=G-HLLE...: 262ms CPU time
Info::
Unattributable: 211ms CPU time
Info::
https://www.ontario.ca/: 132ms CPU time
Warning::
Third-party scripts: 1504ms (100% of total)

Main Thread Breakdown

Script Evaluation 58% Other 19% Script Parsing & Compilation 11% Style & Layout 5% Parse HTML & CSS 5%
ScriptTotalScriptingParse/CompileParty
https://www.ontario.ca/18f5227b-e27b-445a-a53f-f845fbe69b40/stormcaster.js345ms269ms29ms3rd
https://www.ontario.ca/libraries/ontario-search-autosuggest/dist/index.js?v=1.x299ms234ms57ms3rd
https://www.googletagmanager.com/gtag/js?id=G-HLLEK4SB6V&cx=c&gtm=4e64h1262ms219ms40ms3rd
Unattributable211ms7ms0ms3rd
https://www.ontario.ca/132ms7ms2ms3rd
https://www.googletagmanager.com/gtm.js?id=GTM-KZMGBJD123ms94ms28ms3rd
https://www.ontario.ca/themes/ontario_2021/css/ontario2021-theme.css?tdlsdl79ms0ms0ms3rd
https://www.ontario.ca/core/misc/drupal.init.js?v=10.5.954ms42ms0ms3rd
C
JS Bundles
Action
39 scripts, 291 KB unused
REVIEW
39 scripts, 291 KB unused
Warning::
https://www.ontario.ca/libraries/ontario-search-au...: 102 KB unused (40%)
Consider code splitting or tree shaking to reduce unused code.
Warning::
https://www.googletagmanager.com/gtag/js?id=G-HLLE...: 65 KB unused (38%)
Consider code splitting or tree shaking to reduce unused code.
Warning::
https://www.googletagmanager.com/gtm.js?id=GTM-KZM...: 62 KB unused (48%)
Consider code splitting or tree shaking to reduce unused code.
Warning::
https://www.ontario.ca/18f5227b-e27b-445a-a53f-f84...: 40 KB unused (24%)
Consider code splitting or tree shaking to reduce unused code.
Warning::
https://www.ontario.ca/core/assets/vendor/jquery/j...: 22 KB unused (63%)
Consider code splitting or tree shaking to reduce unused code.
Info::
Total unused JavaScript: 291 KB
291 KB unused JavaScript

Downloaded but never executed on this page.

ScriptSizeUnusedMinifiedParty
https://www.ontario.ca/libraries/ontario-search-autosuggest/dist/index.js?v=1.x262 KB102 KB (40%)✓3rd
https://www.googletagmanager.com/gtag/js?id=G-HLLEK4SB6V&cx=c&gtm=4e64h1169 KB65 KB (38%)✓3rd
https://www.googletagmanager.com/gtm.js?id=GTM-KZMGBJD131 KB62 KB (48%)✓3rd
https://www.ontario.ca/18f5227b-e27b-445a-a53f-f845fbe69b40/stormcaster.js165 KB40 KB (24%)✓3rd
https://www.ontario.ca/core/assets/vendor/jquery/jquery.min.js?v=3.7.135 KB22 KB (63%)✓3rd
https://www.ontario.ca/themes/ontario_2021/js/onesite_language_cookie.js1 KB—✓3rd
https://www.ontario.ca/themes/ontario_2021/design_system/scripts/back-to-top.js?tdlsdl1 KB—✓3rd
https://www.ontario.ca/core/assets/vendor/tabbable/index.umd.min.js?v=6.2.03 KB—✓3rd
https://www.ontario.ca/core/misc/progress.js?v=10.5.92 KB—✓3rd
https://www.ontario.ca/core/assets/vendor/loadjs/loadjs.min.js?v=4.3.01 KB—✓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

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
4 fonts (42 KB)
PASS
4 fonts (42 KB)
Info::
4 font(s) use font-display: swap (FOUT risk but functional)

Web fonts

4

42 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 1.0 s 2.0 s 3.0 s FCP 3.4 s LCP 3.4 shttps://www.ontario.ca/themes/ontario_2021/fonts/open-sans-400/open-sans-400.woff2open-sans-400.woff2 https://www.ontario.ca/themes/ontario_2021/fonts/open-sans-400/open-sans-400.woff2 — 10.6 KiB — 218 ms — font-display: swaphttps://www.ontario.ca/themes/ontario_2021/fonts/open-sans-600/open-sans-600.woff2open-sans-600.woff2 https://www.ontario.ca/themes/ontario_2021/fonts/open-sans-600/open-sans-600.woff2 — 10.5 KiB — 289 ms — font-display: swaphttps://www.ontario.ca/libraries/ontario-search-autosuggest/dist/4c1b253e35adce1b24a0.woff24c1b253e35adce1b24a0.woff2 https://www.ontario.ca/libraries/ontario-search-autosuggest/dist/4c1b253e35adce1b24a0.woff2 — 10.6 KiB — 121 ms — font-display: swaphttps://www.ontario.ca/libraries/ontario-search-autosuggest/dist/2576bb4db1bab0467636.woff22576bb4db1bab0467636.woff2 https://www.ontario.ca/libraries/ontario-search-autosuggest/dist/2576bb4db1bab0467636.woff2 — 10.5 KiB — 113 ms — font-display: swap
open-sans-400.woff2 woff2 swap
Size 11 KB
Load time 218 ms
Start 1.2 s
Risk FOUT — text flashes from fallback to web font
open-sans-600.woff2 woff2 swap
Size 11 KB
Load time 289 ms
Start 1.2 s
Risk FOUT — text flashes from fallback to web font
4c1b253e35adce1b24a0.woff2 woff2 swap
Size 11 KB
Load time 121 ms
Start 1.5 s
Risk FOUT — text flashes from fallback to web font
2576bb4db1bab0467636.woff2 woff2 swap
Size 11 KB
Load time 113 ms
Start 1.5 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
A+
Render-Blocking Resources
No render-blocking resources detected
PASS
No render-blocking resources detected
Info::
No render-blocking resources detected in <head>
A+
Third-Party Resources
No third-party resources detected
PASS
No third-party resources detected
Network Waterfall
59 requests over 2067ms
INFO
0 ms 1.0 s 2.0 s 3.0 s FCP 3.4 s LCP 3.4 shttps://ontario.ca// https://ontario.ca/ — 301 — 191 B — 388 ms — http/1.1https://www.ontario.ca/www.ontario.ca/ https://www.ontario.ca/ — 200 — 27.5 KiB — 442 ms — h2https://www.ontario.ca/core/themes/stable9/css/core/components/progress.module.css?tdlsdlwww.ontario.ca/core/themes/stable9/... https://www.ontario.ca/core/themes/stable9/css/core/components/progress.module.css?tdlsdl — 200 — 879 B — 115 ms — h2https://www.ontario.ca/core/themes/stable9/css/core/components/ajax-progress.module.css?tdlsdlwww.ontario.ca/core/themes/stable9/... https://www.ontario.ca/core/themes/stable9/css/core/components/ajax-progress.module.css?tdlsdl — 200 — 1014 B — 122 ms — h2https://www.ontario.ca/themes/ontario_2021/css/ontario2021-theme.css?tdlsdlwww.ontario.ca/themes/ontario_2021/... https://www.ontario.ca/themes/ontario_2021/css/ontario2021-theme.css?tdlsdl — 200 — 127.5 KiB — 319 ms — h2https://www.ontario.ca/core/misc/drupalSettingsLoader.js?v=10.5.9www.ontario.ca/core/misc/drupalSett... https://www.ontario.ca/core/misc/drupalSettingsLoader.js?v=10.5.9 — 200 — 904 B — 118 ms — h2https://www.ontario.ca/modules/contrib/google_tag/js/gtag.js?tdlsdlwww.ontario.ca/modules/contrib/goog... https://www.ontario.ca/modules/contrib/google_tag/js/gtag.js?tdlsdl — 200 — 1.2 KiB — 119 ms — h2https://www.ontario.ca/modules/contrib/google_tag/js/gtm.js?tdlsdlwww.ontario.ca/modules/contrib/goog... https://www.ontario.ca/modules/contrib/google_tag/js/gtm.js?tdlsdl — 200 — 1.1 KiB — 116 ms — h2https://www.ontario.ca/themes/ontario_2021/assets/ontario@2x-print.pngwww.ontario.ca/themes/ontario_2021/... https://www.ontario.ca/themes/ontario_2021/assets/ontario@2x-print.png — 200 — 4.6 KiB — 305 ms — h2https://www.ontario.ca/core/assets/vendor/jquery/jquery.min.js?v=3.7.1www.ontario.ca/core/assets/vendor/j... https://www.ontario.ca/core/assets/vendor/jquery/jquery.min.js?v=3.7.1 — 200 — 35.2 KiB — 320 ms — h2https://www.ontario.ca/core/assets/vendor/once/once.min.js?v=1.0.1www.ontario.ca/core/assets/vendor/o... https://www.ontario.ca/core/assets/vendor/once/once.min.js?v=1.0.1 — 200 — 1.2 KiB — 114 ms — h2https://www.ontario.ca/core/misc/drupal.js?v=10.5.9www.ontario.ca/core/misc/drupal.js?... https://www.ontario.ca/core/misc/drupal.js?v=10.5.9 — 200 — 7.6 KiB — 117 ms — h2https://www.ontario.ca/core/misc/drupal.init.js?v=10.5.9www.ontario.ca/core/misc/drupal.ini... https://www.ontario.ca/core/misc/drupal.init.js?v=10.5.9 — 200 — 1020 B — 122 ms — h2https://www.ontario.ca/core/assets/vendor/tabbable/index.umd.min.js?v=6.2.0www.ontario.ca/core/assets/vendor/t... https://www.ontario.ca/core/assets/vendor/tabbable/index.umd.min.js?v=6.2.0 — 200 — 3.1 KiB — 123 ms — h2https://www.ontario.ca/core/misc/progress.js?v=10.5.9www.ontario.ca/core/misc/progress.j... https://www.ontario.ca/core/misc/progress.js?v=10.5.9 — 200 — 2.4 KiB — 126 ms — h2https://www.ontario.ca/core/assets/vendor/loadjs/loadjs.min.js?v=4.3.0www.ontario.ca/core/assets/vendor/l... https://www.ontario.ca/core/assets/vendor/loadjs/loadjs.min.js?v=4.3.0 — 200 — 1.5 KiB — 127 ms — h2https://www.ontario.ca/core/misc/debounce.js?v=10.5.9www.ontario.ca/core/misc/debounce.j... https://www.ontario.ca/core/misc/debounce.js?v=10.5.9 — 200 — 1.2 KiB — 128 ms — h2https://www.ontario.ca/core/misc/announce.js?v=10.5.9www.ontario.ca/core/misc/announce.j... https://www.ontario.ca/core/misc/announce.js?v=10.5.9 — 200 — 2.3 KiB — 125 ms — h2https://www.ontario.ca/core/misc/message.js?v=10.5.9www.ontario.ca/core/misc/message.js... https://www.ontario.ca/core/misc/message.js?v=10.5.9 — 200 — 3.2 KiB — 129 ms — h2https://www.ontario.ca/core/misc/ajax.js?v=10.5.9www.ontario.ca/core/misc/ajax.js?v=... https://www.ontario.ca/core/misc/ajax.js?v=10.5.9 — 200 — 21.0 KiB — 133 ms — h2https://www.ontario.ca/modules/contrib/google_tag/js/gtag.ajax.js?tdlsdlwww.ontario.ca/modules/contrib/goog... https://www.ontario.ca/modules/contrib/google_tag/js/gtag.ajax.js?tdlsdl — 200 — 798 B — 123 ms — h2https://www.ontario.ca/modules/custom/onesite_datalayer/js/datalayer.js?tdlsdlwww.ontario.ca/modules/custom/onesi... https://www.ontario.ca/modules/custom/onesite_datalayer/js/datalayer.js?tdlsdl — 200 — 1.6 KiB — 130 ms — h2https://www.ontario.ca/modules/custom/onesite_ontario_search_autosuggest/js/search-autosuggest-config.js?v=1.xwww.ontario.ca/modules/custom/onesi... https://www.ontario.ca/modules/custom/onesite_ontario_search_autosuggest/js/search-autosuggest-config.js?v=1.x — 200 — 789 B — 129 ms — h2https://www.ontario.ca/libraries/ontario-search-autosuggest/dist/index.js?v=1.xwww.ontario.ca/libraries/ontario-se... https://www.ontario.ca/libraries/ontario-search-autosuggest/dist/index.js?v=1.x — 200 — 261.6 KiB — 249 ms — h2https://www.ontario.ca/themes/ontario_2021/js/onesite_language_cookie.jswww.ontario.ca/themes/ontario_2021/... https://www.ontario.ca/themes/ontario_2021/js/onesite_language_cookie.js — 200 — 911 B — 241 ms — h2https://www.ontario.ca/themes/ontario_2021/assets/ontario-logo--desktop.svgwww.ontario.ca/themes/ontario_2021/... https://www.ontario.ca/themes/ontario_2021/assets/ontario-logo--desktop.svg — 200 — 3.0 KiB — 242 ms — h2https://www.ontario.ca/themes/ontario_2021/assets/ontario-logo--mobile.svgwww.ontario.ca/themes/ontario_2021/... https://www.ontario.ca/themes/ontario_2021/assets/ontario-logo--mobile.svg — 200 — 1.9 KiB — 242 ms — h2https://designsystem.ontario.ca/scripts/svgxuse.jsdesignsystem.ontario.ca/scripts/svg... https://designsystem.ontario.ca/scripts/svgxuse.js — 200 — 1.8 KiB — 250 ms — h2https://www.ontario.ca/themes/ontario_2021/design_system/scripts/ontario-expand-collapse.js?tdlsdlwww.ontario.ca/themes/ontario_2021/... https://www.ontario.ca/themes/ontario_2021/design_system/scripts/ontario-expand-collapse.js?tdlsdl — 200 — 2.2 KiB — 252 ms — h2https://www.ontario.ca/themes/ontario_2021/design_system/scripts/ontario-a11y.js?tdlsdlwww.ontario.ca/themes/ontario_2021/... https://www.ontario.ca/themes/ontario_2021/design_system/scripts/ontario-a11y.js?tdlsdl — 200 — 1.4 KiB — 241 ms — h2
0 ms 1.0 s 2.0 s 3.0 s FCP 3.4 s LCP 3.4 shttps://ontario.ca// https://ontario.ca/ — 301 — 191 B — 388 ms — http/1.1https://www.ontario.ca/www.ontario.ca/ https://www.ontario.ca/ — 200 — 27.5 KiB — 442 ms — h2https://www.ontario.ca/core/themes/stable9/css/core/components/progress.module.css?tdlsdlwww.ontario.ca/core/themes/stable9/... https://www.ontario.ca/core/themes/stable9/css/core/components/progress.module.css?tdlsdl — 200 — 879 B — 115 ms — h2https://www.ontario.ca/core/themes/stable9/css/core/components/ajax-progress.module.css?tdlsdlwww.ontario.ca/core/themes/stable9/... https://www.ontario.ca/core/themes/stable9/css/core/components/ajax-progress.module.css?tdlsdl — 200 — 1014 B — 122 ms — h2https://www.ontario.ca/themes/ontario_2021/css/ontario2021-theme.css?tdlsdlwww.ontario.ca/themes/ontario_2021/... https://www.ontario.ca/themes/ontario_2021/css/ontario2021-theme.css?tdlsdl — 200 — 127.5 KiB — 319 ms — h2https://www.ontario.ca/core/misc/drupalSettingsLoader.js?v=10.5.9www.ontario.ca/core/misc/drupalSett... https://www.ontario.ca/core/misc/drupalSettingsLoader.js?v=10.5.9 — 200 — 904 B — 118 ms — h2https://www.ontario.ca/modules/contrib/google_tag/js/gtag.js?tdlsdlwww.ontario.ca/modules/contrib/goog... https://www.ontario.ca/modules/contrib/google_tag/js/gtag.js?tdlsdl — 200 — 1.2 KiB — 119 ms — h2https://www.ontario.ca/modules/contrib/google_tag/js/gtm.js?tdlsdlwww.ontario.ca/modules/contrib/goog... https://www.ontario.ca/modules/contrib/google_tag/js/gtm.js?tdlsdl — 200 — 1.1 KiB — 116 ms — h2https://www.ontario.ca/themes/ontario_2021/assets/ontario@2x-print.pngwww.ontario.ca/themes/ontario_2021/... https://www.ontario.ca/themes/ontario_2021/assets/ontario@2x-print.png — 200 — 4.6 KiB — 305 ms — h2https://www.ontario.ca/core/assets/vendor/jquery/jquery.min.js?v=3.7.1www.ontario.ca/core/assets/vendor/j... https://www.ontario.ca/core/assets/vendor/jquery/jquery.min.js?v=3.7.1 — 200 — 35.2 KiB — 320 ms — h2https://www.ontario.ca/core/assets/vendor/once/once.min.js?v=1.0.1www.ontario.ca/core/assets/vendor/o... https://www.ontario.ca/core/assets/vendor/once/once.min.js?v=1.0.1 — 200 — 1.2 KiB — 114 ms — h2https://www.ontario.ca/core/misc/drupal.js?v=10.5.9www.ontario.ca/core/misc/drupal.js?... https://www.ontario.ca/core/misc/drupal.js?v=10.5.9 — 200 — 7.6 KiB — 117 ms — h2https://www.ontario.ca/core/misc/drupal.init.js?v=10.5.9www.ontario.ca/core/misc/drupal.ini... https://www.ontario.ca/core/misc/drupal.init.js?v=10.5.9 — 200 — 1020 B — 122 ms — h2https://www.ontario.ca/core/assets/vendor/tabbable/index.umd.min.js?v=6.2.0www.ontario.ca/core/assets/vendor/t... https://www.ontario.ca/core/assets/vendor/tabbable/index.umd.min.js?v=6.2.0 — 200 — 3.1 KiB — 123 ms — h2https://www.ontario.ca/core/misc/progress.js?v=10.5.9www.ontario.ca/core/misc/progress.j... https://www.ontario.ca/core/misc/progress.js?v=10.5.9 — 200 — 2.4 KiB — 126 ms — h2https://www.ontario.ca/core/assets/vendor/loadjs/loadjs.min.js?v=4.3.0www.ontario.ca/core/assets/vendor/l... https://www.ontario.ca/core/assets/vendor/loadjs/loadjs.min.js?v=4.3.0 — 200 — 1.5 KiB — 127 ms — h2https://www.ontario.ca/core/misc/debounce.js?v=10.5.9www.ontario.ca/core/misc/debounce.j... https://www.ontario.ca/core/misc/debounce.js?v=10.5.9 — 200 — 1.2 KiB — 128 ms — h2https://www.ontario.ca/core/misc/announce.js?v=10.5.9www.ontario.ca/core/misc/announce.j... https://www.ontario.ca/core/misc/announce.js?v=10.5.9 — 200 — 2.3 KiB — 125 ms — h2https://www.ontario.ca/core/misc/message.js?v=10.5.9www.ontario.ca/core/misc/message.js... https://www.ontario.ca/core/misc/message.js?v=10.5.9 — 200 — 3.2 KiB — 129 ms — h2https://www.ontario.ca/core/misc/ajax.js?v=10.5.9www.ontario.ca/core/misc/ajax.js?v=... https://www.ontario.ca/core/misc/ajax.js?v=10.5.9 — 200 — 21.0 KiB — 133 ms — 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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 1504ms · 882KB · CA$21/mo
www.ontario.ca
Other
Costly
Execution 345ms
Transfer 165 KB
Unused 24%
Monthly Cost CA$5/mo
www.ontario.ca
Other
Costly
Execution 299ms
Transfer 262 KB
Unused 40%
Monthly Cost CA$4/mo
Google Tag Manager
Tag Manager
Costly
Execution 262ms
Transfer 169 KB
Unused 38%
Monthly Cost CA$4/mo
Unattributable
Other
Costly
Execution 211ms
Transfer 0 KB
Monthly Cost CA$3/mo
www.ontario.ca
Other
Optional
Execution 132ms
Transfer 27 KB
Monthly Cost CA$2/mo
Google Tag Manager
Tag Manager
Optional
Execution 123ms
Transfer 131 KB
Unused 48%
Monthly Cost CA$2/mo
www.ontario.ca
Other
Optional
Execution 79ms
Transfer 128 KB
Monthly Cost CA$1/mo
www.ontario.ca
Other
Optional
Execution 54ms
Transfer 1 KB
Monthly Cost CA$1/mo

These scripts may cost more than they're worth

  • www.ontario.ca adds 345ms and costs ~CA$5/month
  • www.ontario.ca adds 299ms and costs ~CA$4/month
  • Google Tag Manager adds 262ms and costs ~CA$4/month
  • Unattributable adds 211ms 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.ontario.ca takes 345ms 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.ontario.ca takes 299ms 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 262ms 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 211ms 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

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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