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Performance

· 17 checks — Lighthouse + waterfall + sustainability rolled into one auditable list.
SCORE
77
GRADE
C
FIX
5
REVIEW
3
PASS
7
INFO
2

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

Mobile Desktop
52
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.

3.34 s

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

6.61 s

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

718 ms

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

0.040

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

3.34 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.

15.65 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 3 REVIEW 5 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 (1.6 MiB of 1.6 MiB)
Info::
Third-party blocking time is low (0 ms)
100%
First-party Third-party
D
JS Execution Cost
Action
2746ms total JS execution
FIX
2746ms total JS execution
Warning::
https://www.utoronto.ca/sites/default/files/js/js_...: 881ms CPU time
Warning::
https://www.utoronto.ca/: 330ms CPU time
Warning::
Unattributable: 299ms CPU time
Warning::
https://www.googletagmanager.com/gtm.js?id=GTM-MFD...: 293ms CPU time
Info::
https://scripts.clarity.ms/0.8.59/clarity.js: 240ms CPU time
Warning::
Third-party scripts: 2746ms (100% of total)

Main Thread Breakdown

Script Evaluation 50% Other 27% Style & Layout 10% Script Parsing & Compilation 7% Rendering 4%
ScriptTotalScriptingParse/CompileParty
https://www.utoronto.ca/sites/default/files/js/js_VCy2J6LZtIMh_H6lzqGsWvzhlseasq-qJK1wThLcg0c.js?scope=footer&delta=0&language=en&theme=bootstrap_uoft&include=eJxLys8vKS4pSiyIL81PK9FPz8lPSszRLS6pzMnMSwcAs1UL0w881ms221ms17ms3rd
https://www.utoronto.ca/330ms116ms21ms3rd
Unattributable299ms10ms0ms3rd
https://www.googletagmanager.com/gtm.js?id=GTM-MFDGDNZ293ms247ms42ms3rd
https://scripts.clarity.ms/0.8.59/clarity.js240ms222ms8ms3rd
https://www.googletagmanager.com/gtag/js?id=G-0X74MN6XS3&cx=c&gtm=4e64k0h1227ms187ms38ms3rd
https://www.googletagmanager.com/gtag/js?id=DC-10488607&cx=c&gtm=4e64k0h1211ms177ms27ms3rd
https://www.googletagmanager.com/gtag/destination?id=AW-755633847&cx=c&gtm=4e64k1140ms107ms32ms3rd
https://js-agent.newrelic.com/nr-spa-1.313.1.min.js126ms103ms7ms3rd
D
JS Bundles
Action
9 scripts, 304 KB unused
FIX
9 scripts, 304 KB unused
Warning::
https://www.googletagmanager.com/gtag/destination?...: 67 KB unused (50%)
Consider code splitting or tree shaking to reduce unused code.
Warning::
https://www.googletagmanager.com/gtag/js?id=G-0X74...: 66 KB unused (42%)
Consider code splitting or tree shaking to reduce unused code.
Warning::
https://www.googletagmanager.com/gtm.js?id=GTM-MFD...: 66 KB unused (40%)
Consider code splitting or tree shaking to reduce unused code.
Warning::
https://www.googletagmanager.com/gtag/js?id=DC-104...: 56 KB unused (43%)
Consider code splitting or tree shaking to reduce unused code.
Warning::
https://www.utoronto.ca/sites/default/files/js/js_...: 50 KB unused (74%)
Consider code splitting or tree shaking to reduce unused code.
Info::
Total unused JavaScript: 304 KB
304 KB unused JavaScript

Downloaded but never executed on this page.

ScriptSizeUnusedMinifiedParty
https://www.googletagmanager.com/gtag/destination?id=AW-755633847&cx=c&gtm=4e64k1134 KB67 KB (50%)✓3rd
https://www.googletagmanager.com/gtag/js?id=G-0X74MN6XS3&cx=c&gtm=4e64k0h1158 KB66 KB (42%)✓3rd
https://www.googletagmanager.com/gtm.js?id=GTM-MFDGDNZ164 KB66 KB (40%)✓3rd
https://www.googletagmanager.com/gtag/js?id=DC-10488607&cx=c&gtm=4e64k0h1129 KB56 KB (43%)✓3rd
https://www.utoronto.ca/sites/default/files/js/js_VCy2J6LZtIMh_H6lzqGsWvzhlseasq-qJK1wThLcg0c.js?scope=footer&delta=0&language=en&theme=bootstrap_uoft&include=eJxLys8vKS4pSiyIL81PK9FPz8lPSszRLS6pzMnMSwcAs1UL0w68 KB50 KB (74%)✓3rd
https://www.utoronto.ca/sites/default/files/google_tag/utoronto.ca/google_tag.script.js?tdwgf21 KB—✓3rd
https://www.clarity.ms/tag/kipwt2qd7w?ref=gtm21 KB—✓3rd
https://scripts.clarity.ms/0.8.59/clarity.js26 KB—✓3rd
https://js-agent.newrelic.com/nr-spa-1.313.1.min.js30 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
52 resources · 1.6 MB · 304 KB savings available
FIX
52 resources · 1.6 MB · 304 KB savings available
Warning::
Page weight 630 KB over 1MB target
Got: 1.6 MB Expected: ≤ 1 MB
Info::
~304 KB of savings available
Warning::
51 third-party resources (100% of weight)
52 resources · 1.6 MiB · 51 third-party 629.5 KiB over 1MB target
JavaScript 43% · 710.1 KiB
Font 26% · 429.9 KiB
Image 23% · 375.3 KiB
CSS 6% · 93.5 KiB
Document 3% · 42.3 KiB
Other 0% · 2.4 KiB

~303.8 KiB of savings available

Remove unused JavaScript: 303.8 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
Page Weight Budget
Action
1.6 MB transferred, 52 requests
REVIEW
1.6 MB transferred, 52 requests
Info::
Page weighs 3.4 MB (1.6 MB transferred)
Warning::
JavaScript is 710 KB — consider code splitting or lazy loading
Large JavaScript bundles delay interactivity. Split code by route or defer non-critical scripts.
Got: 710 KB
Info::
Fonts are 430 KB — consider subsetting or using system fonts
Subset fonts to include only used characters, or switch to system font stacks.
Got: 430 KB
Info::
52 HTTP requests
Info::
Estimated 0.34 g CO2 per page load
1.6 MB / 2.4 MB budget
1.6 MB transferred
52 requests
0.34 g CO2 per page load
JavaScript 710.1 KiB 43%
Fonts 429.9 KiB 26%
Images 369.8 KiB 22%
CSS 93.5 KiB 6%
HTML 42.1 KiB 3%
Other 4.4 KiB 0%
Other 2.5 KiB 0%
Other 675 B 0%
Other 558 B 0%
0 2.4 MB 4.9 MB
Approaching limit

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

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

B
Image Optimization
10 images, 0 KB saveable
REVIEW
10 images, 0 KB saveable
Warning::
https://www.utoronto.ca/themes/custom/bootstrap_uo... is missing width/height — may cause layout shift
Set explicit width and height to prevent CLS.
Warning::
https://www.utoronto.ca/sites/default/files/2025-1... is missing width/height — may cause layout shift
Set explicit width and height to prevent CLS.
Warning::
is missing width/height — may cause layout shift
Set explicit width and height to prevent CLS.
10 images 370 KB
0 oversized -0 KB
3 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

Performance issues directly impact user engagement and conversion rates.

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
10 fonts (430 KB)
PASS
10 fonts (430 KB)
Info::
10 font(s) use font-display: swap (FOUT risk but functional)

Web fonts

10

430 KB total

Render-blocking

0

of 10

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 FCP 3.3 s LCP 6.6 shttps://www.utoronto.ca/themes/custom/bootstrap_uoft/fa/webfonts/fa-solid-900.woff2fa-solid-900.woff2 https://www.utoronto.ca/themes/custom/bootstrap_uoft/fa/webfonts/fa-solid-900.woff2 — 153.9 KiB — 31 ms — font-display: swaphttps://www.utoronto.ca/themes/custom/bootstrap_uoft/fa/webfonts/fa-brands-400.woff2fa-brands-400.woff2 https://www.utoronto.ca/themes/custom/bootstrap_uoft/fa/webfonts/fa-brands-400.woff2 — 115.7 KiB — 28 ms — font-display: swaphttps://use.typekit.net/af/f82cc1/00000000000000007735ba3f/31/l?primer=7cdcb44be4a7db8877ffa5c0007b8dd865b3bbc383831fe2ea177f62257a9191&fvd=n7&v=3l https://use.typekit.net/af/f82cc1/00000000000000007735ba3f/31/l?primer=7cdcb44be4a7db8877ffa5c0007b8dd865b3bbc383831fe2ea177f62257a9191&fvd=n7&v=3 — 20.2 KiB — 26 ms — font-display: swaphttps://use.typekit.net/af/8d0537/00000000000000007735ba61/31/l?primer=7cdcb44be4a7db8877ffa5c0007b8dd865b3bbc383831fe2ea177f62257a9191&fvd=n8&v=3l https://use.typekit.net/af/8d0537/00000000000000007735ba61/31/l?primer=7cdcb44be4a7db8877ffa5c0007b8dd865b3bbc383831fe2ea177f62257a9191&fvd=n8&v=3 — 19.4 KiB — 34 ms — font-display: swaphttps://use.typekit.net/af/a741c0/00000000000000007735ba66/30/l?primer=7cdcb44be4a7db8877ffa5c0007b8dd865b3bbc383831fe2ea177f62257a9191&fvd=n4&v=3l https://use.typekit.net/af/a741c0/00000000000000007735ba66/30/l?primer=7cdcb44be4a7db8877ffa5c0007b8dd865b3bbc383831fe2ea177f62257a9191&fvd=n4&v=3 — 19.4 KiB — 26 ms — font-display: swaphttps://use.typekit.net/af/43851c/00000000000000007735ba73/31/l?primer=7cdcb44be4a7db8877ffa5c0007b8dd865b3bbc383831fe2ea177f62257a9191&fvd=n3&v=3l https://use.typekit.net/af/43851c/00000000000000007735ba73/31/l?primer=7cdcb44be4a7db8877ffa5c0007b8dd865b3bbc383831fe2ea177f62257a9191&fvd=n3&v=3 — 16.7 KiB — 28 ms — font-display: swaphttps://use.typekit.net/af/b78836/00000000000000007735ba66/31/l?primer=7cdcb44be4a7db8877ffa5c0007b8dd865b3bbc383831fe2ea177f62257a9191&fvd=n4&v=3l https://use.typekit.net/af/b78836/00000000000000007735ba66/31/l?primer=7cdcb44be4a7db8877ffa5c0007b8dd865b3bbc383831fe2ea177f62257a9191&fvd=n4&v=3 — 19.5 KiB — 36 ms — font-display: swaphttps://use.typekit.net/af/29fcc8/00000000000000007735ba6d/31/l?primer=7cdcb44be4a7db8877ffa5c0007b8dd865b3bbc383831fe2ea177f62257a9191&fvd=i7&v=3l https://use.typekit.net/af/29fcc8/00000000000000007735ba6d/31/l?primer=7cdcb44be4a7db8877ffa5c0007b8dd865b3bbc383831fe2ea177f62257a9191&fvd=i7&v=3 — 20.3 KiB — 37 ms — font-display: swaphttps://use.typekit.net/af/dd0f2a/00000000000000007735ba55/31/l?primer=7cdcb44be4a7db8877ffa5c0007b8dd865b3bbc383831fe2ea177f62257a9191&fvd=i3&v=3l https://use.typekit.net/af/dd0f2a/00000000000000007735ba55/31/l?primer=7cdcb44be4a7db8877ffa5c0007b8dd865b3bbc383831fe2ea177f62257a9191&fvd=i3&v=3 — 19.6 KiB — 33 ms — font-display: swaphttps://www.utoronto.ca/themes/custom/bootstrap_uoft/fa/webfonts/fa-regular-400.woff2fa-regular-400.woff2 https://www.utoronto.ca/themes/custom/bootstrap_uoft/fa/webfonts/fa-regular-400.woff2 — 25.3 KiB — 18 ms — font-display: swap
fa-solid-900.woff2 woff2 swap
Size 154 KB
Load time 31 ms
Start 361 ms
Risk FOUT — text flashes from fallback to web font
  • Subset this font — over 100 KB suggests Latin Extended or full glyph coverage that most pages don't need
fa-brands-400.woff2 woff2 swap
Size 116 KB
Load time 28 ms
Start 362 ms
Risk FOUT — text flashes from fallback to web font
  • Subset this font — over 100 KB suggests Latin Extended or full glyph coverage that most pages don't need
l woff2 swap
Size 20 KB
Load time 26 ms
Start 483 ms
Risk FOUT — text flashes from fallback to web font
l woff2 swap
Size 19 KB
Load time 34 ms
Start 484 ms
Risk FOUT — text flashes from fallback to web font
l woff2 swap
Size 19 KB
Load time 26 ms
Start 485 ms
Risk FOUT — text flashes from fallback to web font
l woff2 swap
Size 17 KB
Load time 28 ms
Start 485 ms
Risk FOUT — text flashes from fallback to web font
l woff2 swap
Size 19 KB
Load time 36 ms
Start 486 ms
Risk FOUT — text flashes from fallback to web font
l woff2 swap
Size 20 KB
Load time 37 ms
Start 486 ms
Risk FOUT — text flashes from fallback to web font
l woff2 swap
Size 20 KB
Load time 33 ms
Start 486 ms
Risk FOUT — text flashes from fallback to web font
fa-regular-400.woff2 woff2 swap
Size 25 KB
Load time 18 ms
Start 517 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)

Fixing the unchecked items could save ~135 KB and ~270 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
6 hints, 0 missing preconnects
PASS
6 hints, 0 missing preconnects
Info::
Page uses 6 resource hint(s)

Current Resource Hints

preconnect
3
preload
3
dns-prefetch
—
prefetch
—

6 resource hints configured

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
52 requests over 2375ms
INFO
0 ms 1.0 s 2.0 s 3.0 s 4.0 s 5.0 s 6.0 s FCP 3.3 s LCP 6.6 shttps://toronto.edu// https://toronto.edu/ — 301 — 108 B — 324 ms — h2https://www.utoronto.ca/www.utoronto.ca/ https://www.utoronto.ca/ — 200 — 41.2 KiB — 23 ms — h2https://www.utoronto.ca/sites/default/files/google_tag/utoronto.ca/google_tag.script.js?tdwgf2www.utoronto.ca/sites/default/files... https://www.utoronto.ca/sites/default/files/google_tag/utoronto.ca/google_tag.script.js?tdwgf2 — 200 — 704 B — 11 ms — h2https://www.utoronto.ca/sites/default/files/css/css_B6J4m3qaqKTSowkFbQoBbxoKUzSuuUEwMQNDZNzRdEs.css?delta=0&language=en&theme=bootstrap_uoft&include=eJyNkNFqBTEIRH8om3xSMLtu1qIxRNPe-_dNS6Gl24c-qDBnGAbBDD1Te8HddaTdLF4q2KFigDsjWSCf5GsefxkcpWfzJ6OtA56LPkJRdfMBPRcYgzSdOuSufoXzpOMOBc0WtsxUL79zh2L5nMw_0NTTU2UtwNtHJ2o17Dow7SpdGza3-Dto2wTb_KctC1ALHQbUhS5Lx5gdOH4rcbY-C5NdeAR72vpPKmAYXgnfLH3uKHpMxneuHJzCwww.utoronto.ca/sites/default/files... https://www.utoronto.ca/sites/default/files/css/css_B6J4m3qaqKTSowkFbQoBbxoKUzSuuUEwMQNDZNzRdEs.css?delta=0&language=en&theme=bootstrap_uoft&include=eJyNkNFqBTEIRH8om3xSMLtu1qIxRNPe-_dNS6Gl24c-qDBnGAbBDD1Te8HddaTdLF4q2KFigDsjWSCf5GsefxkcpWfzJ6OtA56LPkJRdfMBPRcYgzSdOuSufoXzpOMOBc0WtsxUL79zh2L5nMw_0NTTU2UtwNtHJ2o17Dow7SpdGza3-Dto2wTb_KctC1ALHQbUhS5Lx5gdOH4rcbY-C5NdeAR72vpPKmAYXgnfLH3uKHpMxneuHJzC — 200 — 1.4 KiB — 14 ms — h2https://www.utoronto.ca/sites/default/files/css/css_-uY_Am56guxiET18sS3y-zFWF64yFUFbr_ASyCOV5wc.css?delta=1&language=en&theme=bootstrap_uoft&include=eJyNkNFqBTEIRH8om3xSMLtu1qIxRNPe-_dNS6Gl24c-qDBnGAbBDD1Te8HddaTdLF4q2KFigDsjWSCf5GsefxkcpWfzJ6OtA56LPkJRdfMBPRcYgzSdOuSufoXzpOMOBc0WtsxUL79zh2L5nMw_0NTTU2UtwNtHJ2o17Dow7SpdGza3-Dto2wTb_KctC1ALHQbUhS5Lx5gdOH4rcbY-C5NdeAR72vpPKmAYXgnfLH3uKHpMxneuHJzCwww.utoronto.ca/sites/default/files... https://www.utoronto.ca/sites/default/files/css/css_-uY_Am56guxiET18sS3y-zFWF64yFUFbr_ASyCOV5wc.css?delta=1&language=en&theme=bootstrap_uoft&include=eJyNkNFqBTEIRH8om3xSMLtu1qIxRNPe-_dNS6Gl24c-qDBnGAbBDD1Te8HddaTdLF4q2KFigDsjWSCf5GsefxkcpWfzJ6OtA56LPkJRdfMBPRcYgzSdOuSufoXzpOMOBc0WtsxUL79zh2L5nMw_0NTTU2UtwNtHJ2o17Dow7SpdGza3-Dto2wTb_KctC1ALHQbUhS5Lx5gdOH4rcbY-C5NdeAR72vpPKmAYXgnfLH3uKHpMxneuHJzC — 200 — 64.8 KiB — 27 ms — h2https://www.utoronto.ca/sites/default/files/css/css_DUjTsVGh0qSkoQzXlDANhxXQvjHHJKxB9ihy17UL1Do.css?delta=2&language=en&theme=bootstrap_uoft&include=eJyNkNFqBTEIRH8om3xSMLtu1qIxRNPe-_dNS6Gl24c-qDBnGAbBDD1Te8HddaTdLF4q2KFigDsjWSCf5GsefxkcpWfzJ6OtA56LPkJRdfMBPRcYgzSdOuSufoXzpOMOBc0WtsxUL79zh2L5nMw_0NTTU2UtwNtHJ2o17Dow7SpdGza3-Dto2wTb_KctC1ALHQbUhS5Lx5gdOH4rcbY-C5NdeAR72vpPKmAYXgnfLH3uKHpMxneuHJzCwww.utoronto.ca/sites/default/files... 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https://use.typekit.net/af/b78836/00000000000000007735ba66/31/l?primer=7cdcb44be4a7db8877ffa5c0007b8dd865b3bbc383831fe2ea177f62257a9191&fvd=n4&v=3 — 200 — 19.5 KiB — 36 ms — h2https://use.typekit.net/af/29fcc8/00000000000000007735ba6d/31/l?primer=7cdcb44be4a7db8877ffa5c0007b8dd865b3bbc383831fe2ea177f62257a9191&fvd=i7&v=3use.typekit.net/af/29fcc8/000000000... https://use.typekit.net/af/29fcc8/00000000000000007735ba6d/31/l?primer=7cdcb44be4a7db8877ffa5c0007b8dd865b3bbc383831fe2ea177f62257a9191&fvd=i7&v=3 — 200 — 20.3 KiB — 37 ms — h2https://use.typekit.net/af/dd0f2a/00000000000000007735ba55/31/l?primer=7cdcb44be4a7db8877ffa5c0007b8dd865b3bbc383831fe2ea177f62257a9191&fvd=i3&v=3use.typekit.net/af/dd0f2a/000000000... https://use.typekit.net/af/dd0f2a/00000000000000007735ba55/31/l?primer=7cdcb44be4a7db8877ffa5c0007b8dd865b3bbc383831fe2ea177f62257a9191&fvd=i3&v=3 — 200 — 19.6 KiB — 33 ms — h2https://www.utoronto.ca/sites/default/files/styles/brand_event_307x198/public/2026-04/iStock-2252304846-Web.png?itok=Bgdh11xBwww.utoronto.ca/sites/default/files... https://www.utoronto.ca/sites/default/files/styles/brand_event_307x198/public/2026-04/iStock-2252304846-Web.png?itok=Bgdh11xB — 200 — 42.6 KiB — 17 ms — h2https://www.utoronto.ca/sites/default/files/styles/focal_750x500/public/2026-02/55062213624_e5a2545e3e_o-crop.png?h=9e499333&itok=kwWV7gDwwww.utoronto.ca/sites/default/files... https://www.utoronto.ca/sites/default/files/styles/focal_750x500/public/2026-02/55062213624_e5a2545e3e_o-crop.png?h=9e499333&itok=kwWV7gDw — 200 — 40.6 KiB — 11 ms — h2https://www.utoronto.ca/themes/custom/bootstrap_uoft/fa/webfonts/fa-regular-400.woff2www.utoronto.ca/themes/custom/boots... https://www.utoronto.ca/themes/custom/bootstrap_uoft/fa/webfonts/fa-regular-400.woff2 — 200 — 25.3 KiB — 18 ms — h2https://www.googletagmanager.com/gtm.js?id=GTM-MFDGDNZwww.googletagmanager.com/gtm.js?id=... https://www.googletagmanager.com/gtm.js?id=GTM-MFDGDNZ — 200 — 163.6 KiB — 180 ms — h2https://www.googletagmanager.com/gtag/js?id=G-0X74MN6XS3&cx=c&gtm=4e64k0h1www.googletagmanager.com/gtag/js?id... https://www.googletagmanager.com/gtag/js?id=G-0X74MN6XS3&cx=c&gtm=4e64k0h1 — 200 — 157.7 KiB — 67 ms — h2https://www.googletagmanager.com/gtag/js?id=DC-10488607&cx=c&gtm=4e64k0h1www.googletagmanager.com/gtag/js?id... https://www.googletagmanager.com/gtag/js?id=DC-10488607&cx=c&gtm=4e64k0h1 — 200 — 129.3 KiB — 78 ms — h2https://www.clarity.ms/tag/kipwt2qd7w?ref=gtm2www.clarity.ms/tag/kipwt2qd7w?ref=g... https://www.clarity.ms/tag/kipwt2qd7w?ref=gtm2 — 200 — 861 B — 151 ms — http/1.1https://www.google.com/ccm/collect?rcb=4&frm=0&ae=g&en=page_view&dl=https%3A%2F%2Fwww.utoronto.ca%2F&scrsrc=www.googletagmanager.com&rnd=1279276751.1776896508&dt=University%20of%20Toronto&auid=674276453.1776896508&navt=n&npa=1&ep.ads_data_redaction=0&gtm=45He64k0h1v859234634za200zd859234634xea&gcd=13l3l3l2l1l1&dma_cps=a&dma=1&tag_exp=0~115938465~115938469~117266400&apve=1&apvf=f&apvc=1&tft=1776896508383&tfd=772www.google.com/ccm/collect?rcb=4&fr... https://www.google.com/ccm/collect?rcb=4&frm=0&ae=g&en=page_view&dl=https%3A%2F%2Fwww.utoronto.ca%2F&scrsrc=www.googletagmanager.com&rnd=1279276751.1776896508&dt=University%20of%20Toronto&auid=674276453.1776896508&navt=n&npa=1&ep.ads_data_redaction=0&gtm=45He64k0h1v859234634za200zd859234634xea&gcd=13l3l3l2l1l1&dma_cps=a&dma=1&tag_exp=0~115938465~115938469~117266400&apve=1&apvf=f&apvc=1&tft=1776896508383&tfd=772 — 200 — 21 B — 110 ms — 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h3https://adservice.google.com/ddm/fls/z/src=10488607;type=insul0;cat=2020_0;rcb=8;ord=1;num=1769868065769;npa=1;auiddc=*;uaa=;uab=64;uafvl=Chromium%3B147.0.7727.101%7CNot.A%252FBrand%3B8.0.0.0;uamb=1;uam=moto%20g%20power%20(2022);uap=Android;uapv=11.0;uaw=0;pscdl=noapi;frm=0;_tu=KJA;gtm=45fe64k1v9190059841z8859234634za20gzb859234634zd859234634xea;gcd=13l3l3l2l1l1;dma_cps=a;dma=1;dc_fmt=2;tag_exp=0~115938465~115938469~117266401~117384405~118128922;epver=2;dc_random=1776896508_zuF70jtRIhV0Jzjsj-hHC1Fz_D1kLo4glA;_dc_test=1;~oref=https%3A%2F%2Fwww.utoronto.ca%2Fadservice.google.com/ddm/fls/z/src=... https://adservice.google.com/ddm/fls/z/src=10488607;type=insul0;cat=2020_0;rcb=8;ord=1;num=1769868065769;npa=1;auiddc=*;uaa=;uab=64;uafvl=Chromium%3B147.0.7727.101%7CNot.A%252FBrand%3B8.0.0.0;uamb=1;uam=moto%20g%20power%20(2022);uap=Android;uapv=11.0;uaw=0;pscdl=noapi;frm=0;_tu=KJA;gtm=45fe64k1v9190059841z8859234634za20gzb859234634zd859234634xea;gcd=13l3l3l2l1l1;dma_cps=a;dma=1;dc_fmt=2;tag_exp=0~115938465~115938469~117266401~117384405~118128922;epver=2;dc_random=1776896508_zuF70jtRIhV0Jzjsj-hHC1Fz_D1kLo4glA;_dc_test=1;~oref=https%3A%2F%2Fwww.utoronto.ca%2F — 302 — 22 B — 121 ms — h3https://www.google.com/gmp/conversion/_dc_unique_id=6301335136425023117;_dc_ptd=ChAI8OOhzwYQtuXPktuMwIx7Eh8Actxh4FoyrWXEw19LLO7otHPRWcUGw6Pe6f9Vc5qy;_dc_time=1776896508;src=10488607;type=insul0;cat=2020_0;rcb=8;ord=1;num=1769868065769;npa=1;auiddc=674276453.1776896508;uaa=;uab=64;uafvl=Chromium%3B147.0.7727.101%7CNot.A%252FBrand%3B8.0.0.0;uamb=1;uam=moto%20g%20power%20(2022);uap=Android;uapv=11.0;uaw=0;pscdl=noapi;frm=0;_tu=KJA;gtm=45fe64k1v9190059841z8859234634za20gzb859234634zd859234634xea;gcd=13l3l3l2l1l1;dma_cps=a;dma=1;dc_fmt=3;tag_exp=0~115938465~115938469~117266401~117384405~118128922;epver=2;dc_random=1776896508_zuF70jtRIhV0Jzjsj-hHC1Fz_D1kLo4glA;~oref=https%3A%2F%2Fwww.utoronto.ca%2F?www.google.com/gmp/conversion/_dc_u... https://www.google.com/gmp/conversion/_dc_unique_id=6301335136425023117;_dc_ptd=ChAI8OOhzwYQtuXPktuMwIx7Eh8Actxh4FoyrWXEw19LLO7otHPRWcUGw6Pe6f9Vc5qy;_dc_time=1776896508;src=10488607;type=insul0;cat=2020_0;rcb=8;ord=1;num=1769868065769;npa=1;auiddc=674276453.1776896508;uaa=;uab=64;uafvl=Chromium%3B147.0.7727.101%7CNot.A%252FBrand%3B8.0.0.0;uamb=1;uam=moto%20g%20power%20(2022);uap=Android;uapv=11.0;uaw=0;pscdl=noapi;frm=0;_tu=KJA;gtm=45fe64k1v9190059841z8859234634za20gzb859234634zd859234634xea;gcd=13l3l3l2l1l1;dma_cps=a;dma=1;dc_fmt=3;tag_exp=0~115938465~115938469~117266401~117384405~118128922;epver=2;dc_random=1776896508_zuF70jtRIhV0Jzjsj-hHC1Fz_D1kLo4glA;~oref=https%3A%2F%2Fwww.utoronto.ca%2F? — 200 — 63 B — 213 ms — h3https://k.clarity.ms/collectk.clarity.ms/collect https://k.clarity.ms/collect — 204 — 279 B — 455 ms — http/1.1https://adservice.google.com/ddm/fls/z/src=10488607;dc_pre=CO3B2Km_gpQDFUhSpAQdZ0QrlA;type=insul0;cat=2020_0;rcb=8;ord=1;num=1769868065769;npa=1;auiddc=*;uaa=;uab=64;uafvl=Chromium%3B147.0.7727.101%7CNot.A%252FBrand%3B8.0.0.0;uamb=1;uam=moto%20g%20power%20(2022);uap=Android;uapv=11.0;uaw=0;pscdl=noapi;frm=0;_tu=KJA;gtm=45fe64k1v9190059841z8859234634za20gzb859234634zd859234634xea;gcd=13l3l3l2l1l1;dma_cps=a;dma=1;dc_fmt=2;tag_exp=0~115938465~115938469~117266401~117384405~118128922;epver=2;dc_random=1776896508_zuF70jtRIhV0Jzjsj-hHC1Fz_D1kLo4glA;_dc_test=1;~oref=https%3A%2F%2Fwww.utoronto.ca%2Fadservice.google.com/ddm/fls/z/src=... https://adservice.google.com/ddm/fls/z/src=10488607;dc_pre=CO3B2Km_gpQDFUhSpAQdZ0QrlA;type=insul0;cat=2020_0;rcb=8;ord=1;num=1769868065769;npa=1;auiddc=*;uaa=;uab=64;uafvl=Chromium%3B147.0.7727.101%7CNot.A%252FBrand%3B8.0.0.0;uamb=1;uam=moto%20g%20power%20(2022);uap=Android;uapv=11.0;uaw=0;pscdl=noapi;frm=0;_tu=KJA;gtm=45fe64k1v9190059841z8859234634za20gzb859234634zd859234634xea;gcd=13l3l3l2l1l1;dma_cps=a;dma=1;dc_fmt=2;tag_exp=0~115938465~115938469~117266401~117384405~118128922;epver=2;dc_random=1776896508_zuF70jtRIhV0Jzjsj-hHC1Fz_D1kLo4glA;_dc_test=1;~oref=https%3A%2F%2Fwww.utoronto.ca%2F — 200 — 63 B — 35 ms — h3https://js-agent.newrelic.com/nr-spa-1.313.1.min.jsjs-agent.newrelic.com/nr-spa-1.313.... https://js-agent.newrelic.com/nr-spa-1.313.1.min.js — 200 — 30.3 KiB — 28 ms — h2https://www.utoronto.ca/themes/custom/bootstrap_uoft/images/favicons/favicon.icowww.utoronto.ca/themes/custom/boots... https://www.utoronto.ca/themes/custom/bootstrap_uoft/images/favicons/favicon.ico — 200 — 4.2 KiB — 8 ms — h2https://bam.nr-data.net/1/NRJS-27992c020635ff9e4a2?a=1041546173&v=1.313.1&to=NgBTZ0oHWEECV0xfDQ9KcFBMD1lcTHBKQxIACW1dVwJTbiBbVkIQDgldVko6eF0HUW5fBxYmXl1MFFleD1FKG1wXDFRE&rst=1323&ck=0&s=f7a829be95a9e82f&ref=https://www.utoronto.ca/&ptid=d3e3bd67c39bad30&af=err,spa,xhr,stn,ins&ap=475&be=347&fe=930&dc=178&at=GkdQEQIdS08%3D&fsh=1&perf=%7B%22timing%22:%7B%22of%22:1776896507612,%22n%22:0,%22f%22:326,%22dn%22:327,%22dne%22:334,%22c%22:334,%22s%22:334,%22ce%22:338,%22rq%22:338,%22rp%22:347,%22rpe%22:350,%22di%22:515,%22ds%22:516,%22de%22:525,%22dc%22:1274,%22l%22:1274,%22le%22:1277%7D,%22navigation%22:%7B%7D%7D&fp=512&fcp=512bam.nr-data.net/1/NRJS-27992c020635... https://bam.nr-data.net/1/NRJS-27992c020635ff9e4a2?a=1041546173&v=1.313.1&to=NgBTZ0oHWEECV0xfDQ9KcFBMD1lcTHBKQxIACW1dVwJTbiBbVkIQDgldVko6eF0HUW5fBxYmXl1MFFleD1FKG1wXDFRE&rst=1323&ck=0&s=f7a829be95a9e82f&ref=https://www.utoronto.ca/&ptid=d3e3bd67c39bad30&af=err,spa,xhr,stn,ins&ap=475&be=347&fe=930&dc=178&at=GkdQEQIdS08%3D&fsh=1&perf=%7B%22timing%22:%7B%22of%22:1776896507612,%22n%22:0,%22f%22:326,%22dn%22:327,%22dne%22:334,%22c%22:334,%22s%22:334,%22ce%22:338,%22rq%22:338,%22rp%22:347,%22rpe%22:350,%22di%22:515,%22ds%22:516,%22de%22:525,%22dc%22:1274,%22l%22:1274,%22le%22:1277%7D,%22navigation%22:%7B%7D%7D&fp=512&fcp=512 — 200 — 727 B — 255 ms — http/1.1https://bam.nr-data.net/events/1/NRJS-27992c020635ff9e4a2?a=1041546173&v=1.313.1&to=NgBTZ0oHWEECV0xfDQ9KcFBMD1lcTHBKQxIACW1dVwJTbiBbVkIQDgldVko6eF0HUW5fBxYmXl1MFFleD1FKG1wXDFRE&rst=1589&ck=0&s=f7a829be95a9e82f&ref=https://www.utoronto.ca/&ptid=d3e3bd67c39bad30bam.nr-data.net/events/1/NRJS-27992... https://bam.nr-data.net/events/1/NRJS-27992c020635ff9e4a2?a=1041546173&v=1.313.1&to=NgBTZ0oHWEECV0xfDQ9KcFBMD1lcTHBKQxIACW1dVwJTbiBbVkIQDgldVko6eF0HUW5fBxYmXl1MFFleD1FKG1wXDFRE&rst=1589&ck=0&s=f7a829be95a9e82f&ref=https://www.utoronto.ca/&ptid=d3e3bd67c39bad30 — 200 — 417 B — 208 ms — http/1.1https://bam.nr-data.net/jserrors/1/NRJS-27992c020635ff9e4a2?a=1041546173&v=1.313.1&to=NgBTZ0oHWEECV0xfDQ9KcFBMD1lcTHBKQxIACW1dVwJTbiBbVkIQDgldVko6eF0HUW5fBxYmXl1MFFleD1FKG1wXDFRE&rst=1590&ck=0&s=f7a829be95a9e82f&ref=https://www.utoronto.ca/&ptid=d3e3bd67c39bad30bam.nr-data.net/jserrors/1/NRJS-279... https://bam.nr-data.net/jserrors/1/NRJS-27992c020635ff9e4a2?a=1041546173&v=1.313.1&to=NgBTZ0oHWEECV0xfDQ9KcFBMD1lcTHBKQxIACW1dVwJTbiBbVkIQDgldVko6eF0HUW5fBxYmXl1MFFleD1FKG1wXDFRE&rst=1590&ck=0&s=f7a829be95a9e82f&ref=https://www.utoronto.ca/&ptid=d3e3bd67c39bad30 — 200 — 417 B — 207 ms — http/1.1https://bam.nr-data.net/events/1/NRJS-27992c020635ff9e4a2?a=1041546173&v=1.313.1&to=NgBTZ0oHWEECV0xfDQ9KcFBMD1lcTHBKQxIACW1dVwJTbiBbVkIQDgldVko6eF0HUW5fBxYmXl1MFFleD1FKG1wXDFRE&rst=1592&ck=0&s=f7a829be95a9e82f&ref=https://www.utoronto.ca/&ptid=d3e3bd67c39bad30bam.nr-data.net/events/1/NRJS-27992... https://bam.nr-data.net/events/1/NRJS-27992c020635ff9e4a2?a=1041546173&v=1.313.1&to=NgBTZ0oHWEECV0xfDQ9KcFBMD1lcTHBKQxIACW1dVwJTbiBbVkIQDgldVko6eF0HUW5fBxYmXl1MFFleD1FKG1wXDFRE&rst=1592&ck=0&s=f7a829be95a9e82f&ref=https://www.utoronto.ca/&ptid=d3e3bd67c39bad30 — 200 — 417 B — 199 ms — http/1.1https://k.clarity.ms/collectk.clarity.ms/collect https://k.clarity.ms/collect — 204 — 279 B — 100 ms — http/1.1
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 2746ms · 750KB · CA$38/mo
www.utoronto.ca
Other
Costly
Execution 881ms
Transfer 68 KB
Unused 74%
Monthly Cost CA$12/mo
www.utoronto.ca
Other
Costly
Execution 330ms
Transfer 41 KB
Monthly Cost CA$5/mo
Unattributable
Other
Costly
Execution 299ms
Transfer 0 KB
Monthly Cost CA$4/mo
Google Tag Manager
Tag Manager
Costly
Execution 293ms
Transfer 164 KB
Unused 40%
Monthly Cost CA$4/mo
Microsoft Clarity
Session Replay
Costly
Execution 240ms
Transfer 26 KB
Monthly Cost CA$3/mo
Google Tag Manager
Tag Manager
Costly
Execution 227ms
Transfer 158 KB
Unused 42%
Monthly Cost CA$3/mo
Google Tag Manager
Tag Manager
Costly
Execution 211ms
Transfer 129 KB
Unused 43%
Monthly Cost CA$3/mo
Google Tag Manager
Tag Manager
Optional
Execution 140ms
Transfer 134 KB
Unused 50%
Monthly Cost CA$2/mo
js-agent.newrelic.com
Other
Optional
Execution 126ms
Transfer 30 KB
Monthly Cost CA$2/mo

These scripts may cost more than they're worth

  • www.utoronto.ca adds 881ms and costs ~CA$12/month
  • www.utoronto.ca adds 330ms and costs ~CA$5/month
  • Unattributable adds 299ms and costs ~CA$4/month
  • Google Tag Manager adds 293ms and costs ~CA$4/month
  • Microsoft Clarity adds 240ms and costs ~CA$3/month
  • Google Tag Manager adds 227ms and costs ~CA$3/month
  • Google Tag Manager 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.utoronto.ca takes 881ms 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

74% of www.utoronto.ca'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

www.utoronto.ca takes 330ms 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 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 293ms 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

Microsoft Clarity takes 240ms 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 227ms 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 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

50% 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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