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https://umontreal.ca

Performance

· 15 checks — Lighthouse + waterfall + sustainability rolled into one auditable list.
SCORE
73
GRADE
C
FIX
5
REVIEW
3
PASS
5
INFO
2

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

Mobile Desktop
68
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.

1.69 s

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

3.71 s

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

52 ms

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

0.004

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

2.64 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.

3.76 s

Page Load Progression

390 ms
780 ms
1.2 s
1.6 s
1.9 s
2.3 s
2.7 s
3.1 s
Checks
15
5 PASS 3 REVIEW 5 FIX
F
Page Weight Budget
Action
2.9 MB transferred, 54 requests
FIX
2.9 MB transferred, 54 requests
Warning::
Page weighs 6.6 MB (2.9 MB transferred)
Warning::
Images are 1.8 MB — compress or use modern formats
Convert images to WebP/AVIF and resize to display dimensions to reduce transfer size.
Got: 1.8 MB
Warning::
JavaScript is 831 KB — consider code splitting or lazy loading
Large JavaScript bundles delay interactivity. Split code by route or defer non-critical scripts.
Got: 831 KB
Info::
54 HTTP requests
Info::
Estimated 0.62 g CO2 per page load
2.9 MB / 2.4 MB budget
2.9 MB transferred
54 requests
0.62 g CO2 per page load
Images 1.8 MiB 61%
JavaScript 831.4 KiB 28%
Fonts 181.7 KiB 6%
CSS 135.7 KiB 4%
HTML 13.8 KiB 0%
Other 1.4 KiB 0%
Other 930 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 (2.9 MiB of 2.9 MiB)
Info::
Third-party blocking time is low (0 ms)
100%
First-party Third-party
D
JS Bundles
Action
21 scripts, 313 KB unused
FIX
21 scripts, 313 KB unused
Warning::
https://www.googletagmanager.com/gtag/js?id=G-TNZ9...: 72 KB unused (41%)
Consider code splitting or tree shaking to reduce unused code.
Warning::
https://www.googletagmanager.com/gtag/js?id=G-SGNL...: 68 KB unused (42%)
Consider code splitting or tree shaking to reduce unused code.
Warning::
https://www.googletagmanager.com/gtm.js?id=GTM-59W...: 63 KB unused (54%)
Consider code splitting or tree shaking to reduce unused code.
Warning::
https://www.googletagmanager.com/gtm.js?id=GTM-WC3...: 63 KB unused (49%)
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: 313 KB
313 KB unused JavaScript

Downloaded but never executed on this page.

ScriptSizeUnusedMinifiedParty
https://www.googletagmanager.com/gtag/js?id=G-TNZ9KQ9QXF&cx=c&gtm=4e64h1h1174 KB72 KB (41%)✓3rd
https://www.googletagmanager.com/gtag/js?id=G-SGNLEXPKRH&cx=c&gtm=4e64k0h2160 KB68 KB (42%)✓3rd
https://www.googletagmanager.com/gtm.js?id=GTM-59WZNRC117 KB63 KB (54%)✓3rd
https://www.googletagmanager.com/gtm.js?id=GTM-WC3S7D3128 KB63 KB (49%)✓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
54 resources · 2.9 MB · 313 KB savings available
FIX
54 resources · 2.9 MB · 313 KB savings available
Warning::
Page weight 1.9 MB over 1MB target
Got: 2.9 MB Expected: ≤ 1 MB
Info::
~313 KB of savings available
Warning::
53 third-party resources (100% of weight)
Info::
3 resources over 200KB
54 resources · 2.9 MiB · 53 third-party 1.9 MiB over 1MB target
Image 61% · 1.8 MiB
JavaScript 28% · 831.4 KiB
Font 6% · 181.7 KiB
CSS 4% · 135.7 KiB
Document 0% · 14.5 KiB
Other 0% · 1.8 KiB

~312.6 KiB of savings available

Remove unused JavaScript: 312.6 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
12 images, 0 KB saveable
REVIEW
12 images, 0 KB saveable
Warning::
https://www.umontreal.ca/public/www/user_upload/BA... is missing width/height — may cause layout shift
Set explicit width and height to prevent CLS.
Warning::
https://www.umontreal.ca/public/www/user_upload/BA... is missing width/height — may cause layout shift
Set explicit width and height to prevent CLS.
Warning::
https://www.umontreal.ca/public/www/user_upload/BA... is missing width/height — may cause layout shift
Set explicit width and height to prevent CLS.
12 images 1.8 MB
0 oversized -0 KB
10 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

B
JS Execution Cost
949ms total JS execution
REVIEW
949ms total JS execution
Info::
https://www.umontreal.ca/: 234ms CPU time
Info::
https://www.umontreal.ca/typo3conf/ext/udem_vendor...: 186ms CPU time
Info::
Unattributable: 169ms CPU time
Info::
https://www.googletagmanager.com/gtag/js?id=G-TNZ9...: 96ms CPU time
Info::
https://www.googletagmanager.com/gtag/js?id=G-SGNL...: 77ms CPU time
Warning::
Third-party scripts: 949ms (100% of total)

Main Thread Breakdown

Script Evaluation 41% Style & Layout 23% Other 21% Script Parsing & Compilation 8% Parse HTML & CSS 4%
ScriptTotalScriptingParse/CompileParty
https://www.umontreal.ca/234ms3ms1ms3rd
https://www.umontreal.ca/typo3conf/ext/udem_vendor/Resources/Public/jquery-3.5.1/jquery.min.js?1604402777186ms116ms2ms3rd
Unattributable169ms2ms0ms3rd
https://www.googletagmanager.com/gtag/js?id=G-TNZ9KQ9QXF&cx=c&gtm=4e64h1h196ms75ms20ms3rd
https://www.googletagmanager.com/gtag/js?id=G-SGNLEXPKRH&cx=c&gtm=4e64k0h277ms62ms14ms3rd
https://connect.facebook.net/en_US/fbevents.js68ms50ms19ms3rd
https://www.googletagmanager.com/gtm.js?id=GTM-59WZNRC65ms53ms9ms3rd
https://www.googletagmanager.com/gtm.js?id=GTM-WC3S7D353ms43ms10ms3rd
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 1.0 s 2.0 s 3.0 s FCP 1.7 s LCP 3.7 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 — 142 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 — 223 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 — 222 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 — 222 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 — 272 ms — font-display: swap
ObjectSans-Regular.woff2 woff2 swap
Size 34 KB
Load time 142 ms
Start 1.5 s
Risk FOUT — text flashes from fallback to web font
udem-icons.ttf ttf swap
Size 42 KB
Load time 223 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 222 ms
Start 1.5 s
Risk FOUT — text flashes from fallback to web font
ObjectSans-Light.woff2 woff2 swap
Size 33 KB
Load time 222 ms
Start 1.5 s
Risk FOUT — text flashes from fallback to web font
ObjectSans-Medium.woff2 woff2 swap
Size 37 KB
Load time 272 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
Network Waterfall
54 requests over 2371ms
INFO
0 ms 1.0 s 2.0 s 3.0 s FCP 1.7 s LCP 3.7 shttps://umontreal.ca// https://umontreal.ca/ — 301 — 338 B — 358 ms — http/1.1https://www.umontreal.ca/www.umontreal.ca/ https://www.umontreal.ca/ — 200 — 13.8 KiB — 367 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 — 94 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 — 600 B — 77 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 — 213 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 — 486 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 — 222 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 — 283 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 — 216 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 — 220 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 — 298 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 — 298 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 — 298 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 — 298 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 — 354 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 — 376 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 — 377 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 — 375 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 — 377 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 — 425 ms — http/1.1https://www.umontreal.ca/public/www/user_upload/BAN_umontreal-Encore-temps.jpgwww.umontreal.ca/public/www/user_up... https://www.umontreal.ca/public/www/user_upload/BAN_umontreal-Encore-temps.jpg — 200 — 208.9 KiB — 429 ms — http/1.1https://www.umontreal.ca/public/www/user_upload/BAN_umontreal-ateliers-culturels.jpgwww.umontreal.ca/public/www/user_up... https://www.umontreal.ca/public/www/user_upload/BAN_umontreal-ateliers-culturels.jpg — 200 — 172.1 KiB — 350 ms — http/1.1https://www.umontreal.ca/public/www/user_upload/BAN_umontreal-GR.jpgwww.umontreal.ca/public/www/user_up... https://www.umontreal.ca/public/www/user_upload/BAN_umontreal-GR.jpg — 200 — 302.1 KiB — 291 ms — http/1.1https://www.umontreal.ca/public/www/images/portrait_carre/grande_campagne.pngwww.umontreal.ca/public/www/images/... https://www.umontreal.ca/public/www/images/portrait_carre/grande_campagne.png — 200 — 703.0 KiB — 563 ms — http/1.1https://www.umontreal.ca/public/www/_processed_/3/f/csm_601c7e57ac3f4aeae211dbc584be38ad1cbd0e85_0d09ac9cce.jpgwww.umontreal.ca/public/www/_proces... https://www.umontreal.ca/public/www/_processed_/3/f/csm_601c7e57ac3f4aeae211dbc584be38ad1cbd0e85_0d09ac9cce.jpg — 200 — 111.8 KiB — 288 ms — http/1.1https://secretariatgeneral.umontreal.ca/udem_consentement_temoins.js?v=021123secretariatgeneral.umontreal.ca/ude... https://secretariatgeneral.umontreal.ca/udem_consentement_temoins.js?v=021123 — 200 — 51.0 KiB — 448 ms — http/1.1https://www.umontreal.ca/site.webmanifestwww.umontreal.ca/site.webmanifest https://www.umontreal.ca/site.webmanifest — 200 — 634 B — 287 ms — 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 — 384 ms — http/1.1
0 ms 1.0 s 2.0 s 3.0 s FCP 1.7 s LCP 3.7 shttps://umontreal.ca// https://umontreal.ca/ — 301 — 338 B — 358 ms — http/1.1https://www.umontreal.ca/www.umontreal.ca/ https://www.umontreal.ca/ — 200 — 13.8 KiB — 367 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 — 94 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 — 600 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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 949ms · 719KB · CA$13/mo
www.umontreal.ca
Other
Costly
Execution 234ms
Transfer 14 KB
Monthly Cost CA$3/mo
www.umontreal.ca
Other
Optional
Execution 186ms
Transfer 31 KB
Monthly Cost CA$3/mo
Unattributable
Other
Optional
Execution 169ms
Transfer 0 KB
Monthly Cost CA$2/mo
Google Tag Manager
Tag Manager
Optional
Execution 96ms
Transfer 174 KB
Unused 41%
Monthly Cost CA$1/mo
Google Tag Manager
Tag Manager
Optional
Execution 77ms
Transfer 160 KB
Unused 42%
Monthly Cost CA$1/mo
Facebook Pixel
Advertising
Optional
Execution 68ms
Transfer 97 KB
Unused 48%
Monthly Cost CA$1/mo
Google Tag Manager
Tag Manager
Optional
Execution 65ms
Transfer 117 KB
Unused 54%
Monthly Cost CA$1/mo
Google Tag Manager
Tag Manager
Optional
Execution 53ms
Transfer 128 KB
Unused 49%
Monthly Cost CA$1/mo

These scripts may cost more than they're worth

  • www.umontreal.ca adds 234ms 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 234ms 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 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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