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https://umontreal.ca

Performance

· 17 checks — Lighthouse + waterfall + sustainability rolled into one auditable list.
SCORE
73
GRADE
C
FIX
6
REVIEW
2
PASS
7
INFO
2

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

Mobile Desktop
30
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.
100
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.

4.32 s

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

16.36 s

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

916 ms

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

0.187

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

7.22 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.

16.84 s

Page Load Progression

378 ms
757 ms
1.1 s
1.5 s
1.9 s
2.3 s
2.6 s
3.0 s
Checks
17
7 PASS 2 REVIEW 6 FIX
F
Page Weight Budget
Action
2.6 MB transferred, 53 requests
FIX
2.6 MB transferred, 53 requests
Warning::
Page weighs 6.2 MB (2.6 MB transferred)
Warning::
Images are 1.5 MB — compress or use modern formats
Convert images to WebP/AVIF and resize to display dimensions to reduce transfer size.
Got: 1.5 MB
Warning::
JavaScript is 832 KB — consider code splitting or lazy loading
Large JavaScript bundles delay interactivity. Split code by route or defer non-critical scripts.
Got: 832 KB
Info::
53 HTTP requests
Info::
Estimated 0.54 g CO2 per page load
2.6 MB / 2.4 MB budget
2.6 MB transferred
53 requests
0.54 g CO2 per page load
Images 1.5 MiB 56%
JavaScript 831.8 KiB 31%
Fonts 181.7 KiB 7%
CSS 135.7 KiB 5%
HTML 13.8 KiB 1%
Other 1.4 KiB 0%
Other 932 B 0%
Other 634 B 0%
Other 598 B 0%
0 2.4 MB 4.9 MB
Over budget

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

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

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 (2.6 MiB of 2.6 MiB)
Info::
Third-party blocking time is low (0 ms)
100%
First-party Third-party
F
JS Execution Cost
Action
3948ms total JS execution
FIX
3948ms total JS execution
Warning::
https://www.umontreal.ca/: 1054ms CPU time
Warning::
Unattributable: 549ms CPU time
Warning::
https://www.umontreal.ca/typo3conf/ext/udem_vendor...: 545ms CPU time
Warning::
https://www.googletagmanager.com/gtag/js?id=G-TNZ9...: 368ms CPU time
Warning::
https://www.googletagmanager.com/gtag/js?id=G-SGNL...: 320ms CPU time
Warning::
Third-party scripts: 3948ms (100% of total)

Main Thread Breakdown

Script Evaluation 40% Style & Layout 24% Other 20% Script Parsing & Compilation 8% Parse HTML & CSS 4% Rendering 3%
ScriptTotalScriptingParse/CompileParty
https://www.umontreal.ca/1054ms12ms4ms3rd
Unattributable549ms7ms0ms3rd
https://www.umontreal.ca/typo3conf/ext/udem_vendor/Resources/Public/jquery-3.5.1/jquery.min.js?1604402777545ms352ms14ms3rd
https://www.googletagmanager.com/gtag/js?id=G-TNZ9KQ9QXF&cx=c&gtm=4e64h1368ms293ms69ms3rd
https://www.googletagmanager.com/gtag/js?id=G-SGNLEXPKRH&cx=c&gtm=4e64h1h1320ms269ms48ms3rd
https://www.googletagmanager.com/gtm.js?id=GTM-WC3S7D3307ms252ms40ms3rd
https://secretariatgeneral.umontreal.ca/udem_consentement_temoins.js?v=021123200ms140ms22ms3rd
https://www.googletagmanager.com/gtm.js?id=GTM-59WZNRC174ms117ms56ms3rd
https://www.umontreal.ca/typo3temp/udemlessc/lessphp_9477013ded911f281ce354ea476ce0ead34a363a.css?1769692499172ms0ms0ms3rd
https://connect.facebook.net/en_US/fbevents.js157ms120ms36ms3rd

Showing top 10 of 11 scripts

D
JS Bundles
Action
21 scripts, 312 KB unused
FIX
21 scripts, 312 KB unused
Warning::
https://www.googletagmanager.com/gtag/js?id=G-TNZ9...: 73 KB unused (42%)
Consider code splitting or tree shaking to reduce unused code.
Warning::
https://www.googletagmanager.com/gtag/js?id=G-SGNL...: 66 KB unused (41%)
Consider code splitting or tree shaking to reduce unused code.
Warning::
https://www.googletagmanager.com/gtm.js?id=GTM-59W...: 65 KB unused (55%)
Consider code splitting or tree shaking to reduce unused code.
Warning::
https://www.googletagmanager.com/gtm.js?id=GTM-WC3...: 62 KB unused (48%)
Consider code splitting or tree shaking to reduce unused code.
Warning::
https://connect.facebook.net/en_US/fbevents.js: 47 KB unused (48%)
Consider code splitting or tree shaking to reduce unused code.
Info::
Total unused JavaScript: 312 KB
312 KB unused JavaScript

Downloaded but never executed on this page.

ScriptSizeUnusedMinifiedParty
https://www.googletagmanager.com/gtag/js?id=G-TNZ9KQ9QXF&cx=c&gtm=4e64h1173 KB73 KB (42%)✓3rd
https://www.googletagmanager.com/gtag/js?id=G-SGNLEXPKRH&cx=c&gtm=4e64h1h1160 KB66 KB (41%)✓3rd
https://www.googletagmanager.com/gtm.js?id=GTM-59WZNRC117 KB65 KB (55%)✓3rd
https://www.googletagmanager.com/gtm.js?id=GTM-WC3S7D3128 KB62 KB (48%)✓3rd
https://connect.facebook.net/en_US/fbevents.js97 KB47 KB (48%)✓3rd
https://www.umontreal.ca/typo3conf/ext/udem_vendor/Resources/Public/aos-2.1.1/dist/aos.js?15840346155 KB—✓3rd
https://www.umontreal.ca/typo3conf/ext/udem_www/Resources/Public/udem_www_main.js?176969247720 KB—✗3rd
https://www.umontreal.ca/typo3conf/ext/udem_vendor/Resources/Public/localforage-1.7.2/dist/localforage.min.js?15840346209 KB—✓3rd
https://www.umontreal.ca/typo3conf/ext/udem_vendor/Resources/Public/slick-1.8.1/slick.js?158403462415 KB—✗3rd
https://www.umontreal.ca/typo3conf/ext/udem_vendor/Resources/Public/countUp-1.9.2/countUp.js?15840346183 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

D
Page Weight Inventory
Action
53 resources · 2.6 MB · 312 KB savings available
FIX
53 resources · 2.6 MB · 312 KB savings available
Warning::
Page weight 1.6 MB over 1MB target
Got: 2.6 MB Expected: ≤ 1 MB
Info::
~312 KB of savings available
Warning::
52 third-party resources (100% of weight)
Info::
1 resources over 200KB
53 resources · 2.6 MiB · 52 third-party 1.6 MiB over 1MB target
Image 56% · 1.5 MiB
JavaScript 31% · 831.8 KiB
Font 7% · 181.7 KiB
CSS 5% · 135.7 KiB
Document 1% · 14.5 KiB
Other 0% · 1.8 KiB

~312.1 KiB of savings available

Remove unused JavaScript: 312.1 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.

C
Image Optimization
Action
11 images, 0 KB saveable
REVIEW
11 images, 0 KB saveable
Warning::
https://www.umontreal.ca/public/www/_processed_/1/... is missing width/height — may cause layout shift
Set explicit width and height to prevent CLS.
Warning::
https://www.umontreal.ca/public/www/_processed_/4/... is missing width/height — may cause layout shift
Set explicit width and height to prevent CLS.
Warning::
https://www.umontreal.ca/public/www/_processed_/6/... is missing width/height — may cause layout shift
Set explicit width and height to prevent CLS.
11 images 1.5 MB
0 oversized -0 KB
9 legacy format
3 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

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
5 fonts (182 KB)
PASS
5 fonts (182 KB)
Info::
5 font(s) use font-display: swap (FOUT risk but functional)

Web fonts

5

182 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 2.0 s 4.0 s 6.0 s 8.0 s 10.0 s 12.0 s 14.0 s 16.0 s FCP 4.3 s LCP 16.4 shttps://www.umontreal.ca/typo3conf/ext/udem_bootstrap/Resources/Public/fonts/ObjectSans-Regular.woff2?7ce761ObjectSans-Regular.woff2 https://www.umontreal.ca/typo3conf/ext/udem_bootstrap/Resources/Public/fonts/ObjectSans-Regular.woff2?7ce761 — 33.6 KiB — 143 ms — font-display: swaphttps://www.umontreal.ca/typo3conf/ext/udem_icons/Resources/Public/fonts/udem-icons.ttf?be66c3udem-icons.ttf https://www.umontreal.ca/typo3conf/ext/udem_icons/Resources/Public/fonts/udem-icons.ttf?be66c3 — 41.8 KiB — 121 ms — font-display: swaphttps://www.umontreal.ca/typo3conf/ext/udem_bootstrap/Resources/Public/fonts/ObjectSans-Bold.woff2?7ce761ObjectSans-Bold.woff2 https://www.umontreal.ca/typo3conf/ext/udem_bootstrap/Resources/Public/fonts/ObjectSans-Bold.woff2?7ce761 — 36.3 KiB — 131 ms — font-display: swaphttps://www.umontreal.ca/typo3conf/ext/udem_bootstrap/Resources/Public/fonts/ObjectSans-Light.woff2?7ce761ObjectSans-Light.woff2 https://www.umontreal.ca/typo3conf/ext/udem_bootstrap/Resources/Public/fonts/ObjectSans-Light.woff2?7ce761 — 33.3 KiB — 136 ms — font-display: swaphttps://www.umontreal.ca/typo3conf/ext/udem_bootstrap/Resources/Public/fonts/ObjectSans-Medium.woff2?7ce761ObjectSans-Medium.woff2 https://www.umontreal.ca/typo3conf/ext/udem_bootstrap/Resources/Public/fonts/ObjectSans-Medium.woff2?7ce761 — 36.7 KiB — 194 ms — font-display: swap
ObjectSans-Regular.woff2 woff2 swap
Size 34 KB
Load time 143 ms
Start 1.5 s
Risk FOUT — text flashes from fallback to web font
udem-icons.ttf ttf swap
Size 42 KB
Load time 121 ms
Start 1.5 s
Risk FOUT — text flashes from fallback to web font
  • Convert to woff2 for ~30% smaller file size
ObjectSans-Bold.woff2 woff2 swap
Size 36 KB
Load time 131 ms
Start 1.5 s
Risk FOUT — text flashes from fallback to web font
ObjectSans-Light.woff2 woff2 swap
Size 33 KB
Load time 136 ms
Start 1.5 s
Risk FOUT — text flashes from fallback to web font
ObjectSans-Medium.woff2 woff2 swap
Size 37 KB
Load time 194 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)

Fixing the unchecked items could save ~13 KB and ~26 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
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
53 requests over 2271ms
INFO
0 ms 2.0 s 4.0 s 6.0 s 8.0 s 10.0 s 12.0 s 14.0 s 16.0 s FCP 4.3 s LCP 16.4 shttps://umontreal.ca// https://umontreal.ca/ — 301 — 338 B — 361 ms — http/1.1https://www.umontreal.ca/www.umontreal.ca/ https://www.umontreal.ca/ — 200 — 13.8 KiB — 366 ms — http/1.1https://fonts.googleapis.com/css?family=Judson:400,400i,700&subset=latin,latin-extfonts.googleapis.com/css?family=Jud... https://fonts.googleapis.com/css?family=Judson:400,400i,700&subset=latin,latin-ext — 200 — 624 B — 91 ms — h2https://fonts.googleapis.com/css?family=Open+Sans:400,400italic,300italic,300,600,600italic,700,700italic,800,800italic&subset=latin,latin-extfonts.googleapis.com/css?family=Ope... https://fonts.googleapis.com/css?family=Open+Sans:400,400italic,300italic,300,600,600italic,700,700italic,800,800italic&subset=latin,latin-ext — 200 — 2.8 KiB — 89 ms — h2https://www.umontreal.ca/typo3temp/assets/css/d5f1e4451b.css?1677093387www.umontreal.ca/typo3temp/assets/c... https://www.umontreal.ca/typo3temp/assets/css/d5f1e4451b.css?1677093387 — 200 — 599 B — 76 ms — http/1.1https://www.umontreal.ca/typo3temp/udemlessc/lessphp_23fb09adb36716dd87777c76c75bdb44b2580590.css?1627380938www.umontreal.ca/typo3temp/udemless... https://www.umontreal.ca/typo3temp/udemlessc/lessphp_23fb09adb36716dd87777c76c75bdb44b2580590.css?1627380938 — 200 — 1.0 KiB — 149 ms — http/1.1https://www.umontreal.ca/typo3conf/ext/udem_vendor/Resources/Public/aos-2.1.1/dist/aos.css?1584034615www.umontreal.ca/typo3conf/ext/udem... https://www.umontreal.ca/typo3conf/ext/udem_vendor/Resources/Public/aos-2.1.1/dist/aos.css?1584034615 — 200 — 2.6 KiB — 211 ms — http/1.1https://www.umontreal.ca/typo3temp/udemlessc/lessphp_9477013ded911f281ce354ea476ce0ead34a363a.css?1769692499www.umontreal.ca/typo3temp/udemless... https://www.umontreal.ca/typo3temp/udemlessc/lessphp_9477013ded911f281ce354ea476ce0ead34a363a.css?1769692499 — 200 — 128.0 KiB — 490 ms — http/1.1https://www.umontreal.ca/typo3conf/ext/udem_vendor/Resources/Public/underscore-1.8.3/underscore.min.js?1584034624www.umontreal.ca/typo3conf/ext/udem... https://www.umontreal.ca/typo3conf/ext/udem_vendor/Resources/Public/underscore-1.8.3/underscore.min.js?1584034624 — 200 — 6.1 KiB — 216 ms — http/1.1https://www.umontreal.ca/typo3conf/ext/udem_vendor/Resources/Public/jquery-3.5.1/jquery.min.js?1604402777www.umontreal.ca/typo3conf/ext/udem... https://www.umontreal.ca/typo3conf/ext/udem_vendor/Resources/Public/jquery-3.5.1/jquery.min.js?1604402777 — 200 — 30.6 KiB — 348 ms — http/1.1https://www.umontreal.ca/typo3conf/ext/udem_news/Resources/Public/JavaScript/udem_news.js?1661853939www.umontreal.ca/typo3conf/ext/udem... https://www.umontreal.ca/typo3conf/ext/udem_news/Resources/Public/JavaScript/udem_news.js?1661853939 — 200 — 804 B — 215 ms — http/1.1https://www.umontreal.ca/typo3conf/ext/udem_bootstrap/Resources/Public/udem-social.js?1584034592www.umontreal.ca/typo3conf/ext/udem... https://www.umontreal.ca/typo3conf/ext/udem_bootstrap/Resources/Public/udem-social.js?1584034592 — 200 — 1.4 KiB — 219 ms — http/1.1https://www.umontreal.ca/typo3conf/ext/udem_bootstrap/Resources/Public/udem-instagram.js?1584034592www.umontreal.ca/typo3conf/ext/udem... https://www.umontreal.ca/typo3conf/ext/udem_bootstrap/Resources/Public/udem-instagram.js?1584034592 — 200 — 2.2 KiB — 292 ms — http/1.1https://www.umontreal.ca/typo3conf/ext/udem_bootstrap/Resources/Public/udem-gallerie.js?1589452388www.umontreal.ca/typo3conf/ext/udem... https://www.umontreal.ca/typo3conf/ext/udem_bootstrap/Resources/Public/udem-gallerie.js?1589452388 — 200 — 4.0 KiB — 292 ms — http/1.1https://www.umontreal.ca/typo3conf/ext/udem_bootstrap/Resources/Public/udem-bootstrap-video.js?1584034592www.umontreal.ca/typo3conf/ext/udem... https://www.umontreal.ca/typo3conf/ext/udem_bootstrap/Resources/Public/udem-bootstrap-video.js?1584034592 — 200 — 770 B — 291 ms — http/1.1https://www.umontreal.ca/typo3conf/ext/udem_vendor/Resources/Public/localforage-1.7.2/dist/localforage.min.js?1584034620www.umontreal.ca/typo3conf/ext/udem... https://www.umontreal.ca/typo3conf/ext/udem_vendor/Resources/Public/localforage-1.7.2/dist/localforage.min.js?1584034620 — 200 — 9.2 KiB — 292 ms — http/1.1https://www.umontreal.ca/typo3conf/ext/udem_vendor/Resources/Public/slick-1.8.1/slick.js?1584034624www.umontreal.ca/typo3conf/ext/udem... https://www.umontreal.ca/typo3conf/ext/udem_vendor/Resources/Public/slick-1.8.1/slick.js?1584034624 — 200 — 15.1 KiB — 370 ms — http/1.1https://www.umontreal.ca/typo3conf/ext/udem_vendor/Resources/Public/countUp-1.9.2/countUp.js?1584034618www.umontreal.ca/typo3conf/ext/udem... https://www.umontreal.ca/typo3conf/ext/udem_vendor/Resources/Public/countUp-1.9.2/countUp.js?1584034618 — 200 — 2.8 KiB — 368 ms — http/1.1https://www.umontreal.ca/typo3conf/ext/udem_vendor/Resources/Public/aos-2.1.1/dist/aos.js?1584034615www.umontreal.ca/typo3conf/ext/udem... https://www.umontreal.ca/typo3conf/ext/udem_vendor/Resources/Public/aos-2.1.1/dist/aos.js?1584034615 — 200 — 4.6 KiB — 369 ms — http/1.1https://www.umontreal.ca/typo3conf/ext/udem_www/Resources/Public/udem-countup.js?1584034632www.umontreal.ca/typo3conf/ext/udem... https://www.umontreal.ca/typo3conf/ext/udem_www/Resources/Public/udem-countup.js?1584034632 — 200 — 3.3 KiB — 368 ms — http/1.1https://www.umontreal.ca/typo3conf/ext/udem_www/Resources/Public/udem_www_main.js?1769692477www.umontreal.ca/typo3conf/ext/udem... https://www.umontreal.ca/typo3conf/ext/udem_www/Resources/Public/udem_www_main.js?1769692477 — 200 — 19.6 KiB — 418 ms — http/1.1https://www.umontreal.ca/typo3conf/ext/udem_social/Resources/Public/udemsocial-instagram.js?1659607675www.umontreal.ca/typo3conf/ext/udem... https://www.umontreal.ca/typo3conf/ext/udem_social/Resources/Public/udemsocial-instagram.js?1659607675 — 200 — 2.2 KiB — 441 ms — http/1.1https://www.umontreal.ca/public/www/_processed_/6/1/csm_BAN_umontreal-Encore-temps_27f9e23ba8.jpgwww.umontreal.ca/public/www/_proces... https://www.umontreal.ca/public/www/_processed_/6/1/csm_BAN_umontreal-Encore-temps_27f9e23ba8.jpg — 200 — 103.7 KiB — 280 ms — http/1.1https://www.umontreal.ca/public/www/_processed_/1/8/csm_BAN_umontreal-ateliers-culturels_8cb88a9b24.jpgwww.umontreal.ca/public/www/_proces... https://www.umontreal.ca/public/www/_processed_/1/8/csm_BAN_umontreal-ateliers-culturels_8cb88a9b24.jpg — 200 — 95.2 KiB — 549 ms — http/1.1https://www.umontreal.ca/public/www/_processed_/4/5/csm_BAN_umontreal-GR_43ef77711f.jpgwww.umontreal.ca/public/www/_proces... https://www.umontreal.ca/public/www/_processed_/4/5/csm_BAN_umontreal-GR_43ef77711f.jpg — 200 — 147.4 KiB — 148 ms — 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http/1.1https://urgence.umontreal.ca/typo3conf/ext/udem_urgence/Resources/Public/JavaScript/udem-urgence-bcrp.jsurgence.umontreal.ca/typo3conf/ext/... https://urgence.umontreal.ca/typo3conf/ext/udem_urgence/Resources/Public/JavaScript/udem-urgence-bcrp.js — 200 — 2.6 KiB — 376 ms — http/1.1
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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 3948ms · 919KB · CA$55/mo
www.umontreal.ca
Other
Costly
Execution 1054ms
Transfer 14 KB
Monthly Cost CA$15/mo
Unattributable
Other
Costly
Execution 549ms
Transfer 0 KB
Monthly Cost CA$8/mo
www.umontreal.ca
Other
Costly
Execution 545ms
Transfer 31 KB
Monthly Cost CA$8/mo
Google Tag Manager
Tag Manager
Costly
Execution 368ms
Transfer 173 KB
Unused 42%
Monthly Cost CA$5/mo
Google Tag Manager
Tag Manager
Costly
Execution 320ms
Transfer 160 KB
Unused 41%
Monthly Cost CA$4/mo
Google Tag Manager
Tag Manager
Costly
Execution 307ms
Transfer 128 KB
Unused 48%
Monthly Cost CA$4/mo
secretariatgeneral.umontreal.ca
Other
Costly
Execution 200ms
Transfer 51 KB
Monthly Cost CA$3/mo
Google Tag Manager
Tag Manager
Optional
Execution 174ms
Transfer 117 KB
Unused 55%
Monthly Cost CA$2/mo
www.umontreal.ca
Other
Optional
Execution 172ms
Transfer 128 KB
Monthly Cost CA$2/mo
Facebook Pixel
Advertising
Optional
Execution 157ms
Transfer 97 KB
Unused 48%
Monthly Cost CA$2/mo
www.umontreal.ca
Other
Optional
Execution 102ms
Transfer 20 KB
Monthly Cost CA$1/mo

These scripts may cost more than they're worth

  • www.umontreal.ca adds 1054ms and costs ~CA$15/month
  • Unattributable adds 549ms and costs ~CA$8/month
  • www.umontreal.ca adds 545ms and costs ~CA$8/month
  • Google Tag Manager adds 368ms and costs ~CA$5/month
  • Google Tag Manager adds 320ms and costs ~CA$4/month
  • Google Tag Manager adds 307ms and costs ~CA$4/month
  • secretariatgeneral.umontreal.ca adds 200ms 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.umontreal.ca takes 1054ms 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 549ms 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.umontreal.ca takes 545ms 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 368ms 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 320ms 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 307ms 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

secretariatgeneral.umontreal.ca takes 200ms 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

55% of Google Tag Manager'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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