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https://toronto.edu

Performance

· 15 checks — Lighthouse + waterfall + sustainability rolled into one auditable list.
SCORE
77
GRADE
C
FIX
4
REVIEW
4
PASS
5
INFO
2

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

Mobile Desktop
90
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.

1.22 s

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

1.73 s

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

18 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.

1.22 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.

2.91 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
15
5 PASS 4 REVIEW 4 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 Bundles
Action
9 scripts, 303 KB unused
FIX
9 scripts, 303 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_...: 49 KB unused (73%)
Consider code splitting or tree shaking to reduce unused code.
Info::
Total unused JavaScript: 303 KB
303 KB unused JavaScript

Downloaded but never executed on this page.

ScriptSizeUnusedMinifiedParty
https://www.googletagmanager.com/gtag/destination?id=AW-755633847&cx=c&gtm=4e64k0134 KB67 KB (50%)✓3rd
https://www.googletagmanager.com/gtag/js?id=G-0X74MN6XS3&cx=c&gtm=4e64k0158 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=4e64k0129 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 KB49 KB (73%)✓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
53 resources · 1.6 MB · 303 KB savings available
FIX
53 resources · 1.6 MB · 303 KB savings available
Warning::
Page weight 625 KB over 1MB target
Got: 1.6 MB Expected: ≤ 1 MB
Info::
~303 KB of savings available
Warning::
52 third-party resources (100% of weight)
53 resources · 1.6 MiB · 52 third-party 624.7 KiB over 1MB target
JavaScript 43% · 710.1 KiB
Font 25% · 419.0 KiB
Image 23% · 381.1 KiB
CSS 6% · 93.6 KiB
Document 3% · 42.9 KiB
Other 0% · 2.1 KiB

~303.5 KiB of savings available

Remove unused JavaScript: 303.5 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, 53 requests
REVIEW
1.6 MB transferred, 53 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 419 KB — consider subsetting or using system fonts
Subset fonts to include only used characters, or switch to system font stacks.
Got: 419 KB
Info::
53 HTTP requests
Info::
Estimated 0.34 g CO2 per page load
1.6 MB / 2.4 MB budget
1.6 MB transferred
53 requests
0.34 g CO2 per page load
JavaScript 710.1 KiB 43%
Fonts 419.0 KiB 25%
Images 375.5 KiB 23%
CSS 93.6 KiB 6%
HTML 41.9 KiB 3%
Other 5.2 KiB 0%
Other 2.2 KiB 0%
Other 675 B 0%
Other 549 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::
https://www.utoronto.ca/themes/custom/bootstrap_uo... is missing width/height — may cause layout shift
Set explicit width and height to prevent CLS.
10 images 376 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

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
725ms total JS execution
REVIEW
725ms total JS execution
Warning::
https://www.utoronto.ca/sites/default/files/js/js_...: 258ms CPU time
Info::
https://www.utoronto.ca/: 123ms CPU time
Info::
Unattributable: 81ms CPU time
Info::
https://www.googletagmanager.com/gtm.js?id=GTM-MFD...: 79ms CPU time
Info::
https://www.googletagmanager.com/gtag/js?id=G-0X74...: 71ms CPU time
Warning::
Third-party scripts: 725ms (100% of total)

Main Thread Breakdown

Script Evaluation 46% Other 34% Style & Layout 7% Script Parsing & Compilation 7%
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=eJxLys8vKS4pSiyIL81PK9FPz8lPSszRLS6pzMnMSwcAs1UL0w258ms51ms10ms3rd
https://www.utoronto.ca/123ms31ms6ms3rd
Unattributable81ms3ms0ms3rd
https://www.googletagmanager.com/gtm.js?id=GTM-MFDGDNZ79ms67ms11ms3rd
https://www.googletagmanager.com/gtag/js?id=G-0X74MN6XS3&cx=c&gtm=4e64k071ms57ms11ms3rd
https://scripts.clarity.ms/0.8.59/clarity.js61ms54ms3ms3rd
https://www.googletagmanager.com/gtag/js?id=DC-10488607&cx=c&gtm=4e64k052ms44ms7ms3rd
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 (419 KB)
PASS
10 fonts (419 KB)
Info::
10 font(s) use font-display: swap (FOUT risk but functional)

Web fonts

10

419 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 500 ms 1.0 s 1.5 s FCP 1.2 s LCP 1.7 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 — 24 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 — 115.6 KiB — 21 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 — 17 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 — 18 ms — font-display: swaphttps://www.utoronto.ca/themes/custom/bootstrap_uoft/fonts/uoft-font.woff?-3la2yr=uoft-font.woff https://www.utoronto.ca/themes/custom/bootstrap_uoft/fonts/uoft-font.woff?-3la2yr= — 14.8 KiB — 21 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 — 15 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 — 21 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 — 22 ms — font-display: swaphttps://use.typekit.net/af/685cbf/00000000000000007735ba65/31/l?primer=7cdcb44be4a7db8877ffa5c0007b8dd865b3bbc383831fe2ea177f62257a9191&fvd=i4&v=3l https://use.typekit.net/af/685cbf/00000000000000007735ba65/31/l?primer=7cdcb44be4a7db8877ffa5c0007b8dd865b3bbc383831fe2ea177f62257a9191&fvd=i4&v=3 — 19.9 KiB — 23 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 — 25 ms — font-display: swap
fa-solid-900.woff2 woff2 swap
Size 154 KB
Load time 24 ms
Start 339 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 21 ms
Start 339 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 17 ms
Start 454 ms
Risk FOUT — text flashes from fallback to web font
l woff2 swap
Size 19 KB
Load time 18 ms
Start 455 ms
Risk FOUT — text flashes from fallback to web font
uoft-font.woff woff swap
Size 15 KB
Load time 21 ms
Start 455 ms
Risk FOUT — text flashes from fallback to web font
  • Convert to woff2 for ~30% smaller file size
l woff2 swap
Size 17 KB
Load time 15 ms
Start 455 ms
Risk FOUT — text flashes from fallback to web font
l woff2 swap
Size 19 KB
Load time 21 ms
Start 456 ms
Risk FOUT — text flashes from fallback to web font
l woff2 swap
Size 19 KB
Load time 22 ms
Start 456 ms
Risk FOUT — text flashes from fallback to web font
l woff2 swap
Size 20 KB
Load time 23 ms
Start 456 ms
Risk FOUT — text flashes from fallback to web font
l woff2 swap
Size 20 KB
Load time 25 ms
Start 457 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 ~139 KB and ~278 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
53 requests over 1670ms
INFO
0 ms 500 ms 1.0 s 1.5 s FCP 1.2 s LCP 1.7 shttps://toronto.edu// https://toronto.edu/ — 301 — 108 B — 315 ms — h2https://www.utoronto.ca/www.utoronto.ca/ https://www.utoronto.ca/ — 200 — 41.2 KiB — 12 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 — 633 B — 13 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 — 1.5 KiB — 7 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 — 14 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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h2https://www.googletagmanager.com/gtag/destination?id=AW-755633847&cx=c&gtm=4e64k0www.googletagmanager.com/gtag/desti... https://www.googletagmanager.com/gtag/destination?id=AW-755633847&cx=c&gtm=4e64k0 — 200 — 133.9 KiB — 99 ms — h3https://ad.doubleclick.net/activity;src=10488607;type=insul0;cat=2020_0;rcb=1;ord=1;num=1294871669232;npa=1;auiddc=756654314.1776896524;uaa=x86;uab=64;uafvl=Chromium%3B147.0.7727.101%7CNot.A%252FBrand%3B8.0.0.0;uamb=0;uam=;uap=macOS;uapv=10.15.7;uaw=0;pscdl=noapi;frm=0;_tu=KJA;gtm=45fe64k0v9190059841z8859234634za20gzb859234634zd859234634xea;gcd=13l3l3l2l1l1;dma_cps=a;dma=1;dc_fmt=3;tag_exp=0~115938465~115938469~117266400;epver=2;dc_random=1776896524_nqx-nguFAqydHRChJlDsgss1cqh5dznP1Q;~oref=https%3A%2F%2Fwww.utoronto.ca%2F?ad.doubleclick.net/activity;src=104... 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h3https://10488607.fls.doubleclick.net/activityi;dc_pre=CMfV_7C_gpQDFQGwJwIdhGAj4g;src=10488607;type=insul0;cat=2020_0;rcb=1;ord=1;num=1294871669232;npa=1;auiddc=756654314.1776896524;uaa=x86;uab=64;uafvl=Chromium%3B147.0.7727.101%7CNot.A%252FBrand%3B8.0.0.0;uamb=0;uam=;uap=macOS;uapv=10.15.7;uaw=0;pscdl=noapi;frm=0;_tu=KJA;gtm=45fe64k0v9190059841z8859234634za20gzb859234634zd859234634xea;gcd=13l3l3l2l1l1;dma_cps=a;dma=1;dc_fmt=2;tag_exp=0~115938465~115938469~117266400;epver=2;dc_random=1776896524_nqx-nguFAqydHRChJlDsgss1cqh5dznP1Q;_dc_test=1;~oref=https%3A%2F%2Fwww.utoronto.ca%2F?10488607.fls.doubleclick.net/activi... https://10488607.fls.doubleclick.net/activityi;dc_pre=CMfV_7C_gpQDFQGwJwIdhGAj4g;src=10488607;type=insul0;cat=2020_0;rcb=1;ord=1;num=1294871669232;npa=1;auiddc=756654314.1776896524;uaa=x86;uab=64;uafvl=Chromium%3B147.0.7727.101%7CNot.A%252FBrand%3B8.0.0.0;uamb=0;uam=;uap=macOS;uapv=10.15.7;uaw=0;pscdl=noapi;frm=0;_tu=KJA;gtm=45fe64k0v9190059841z8859234634za20gzb859234634zd859234634xea;gcd=13l3l3l2l1l1;dma_cps=a;dma=1;dc_fmt=2;tag_exp=0~115938465~115938469~117266400;epver=2;dc_random=1776896524_nqx-nguFAqydHRChJlDsgss1cqh5dznP1Q;_dc_test=1;~oref=https%3A%2F%2Fwww.utoronto.ca%2F? — 200 — 692 B — 37 ms — h2https://www.google.com/ccm/collect?rcb=11&frm=0&ae=g&dl=https%3A%2F%2Fwww.utoronto.ca%2F&scrsrc=www.googletagmanager.com&rnd=1958908079.1776896524&dt=University%20of%20Toronto&auid=756654314.1776896524&navt=n&npa=1&_tu=KA&gtm=45be64k0z8859234634za20gzb859234634zd859234634xea&gcd=13l3l3l2l1l1&dma_cps=a&dma=1&tag_exp=0~115938465~115938469~117266400&apve=1&apvf=f&apvc=0&tids=AW-755633847&tid=AW-755633847&tft=1776896524191&tfd=1047www.google.com/ccm/collect?rcb=11&f... https://www.google.com/ccm/collect?rcb=11&frm=0&ae=g&dl=https%3A%2F%2Fwww.utoronto.ca%2F&scrsrc=www.googletagmanager.com&rnd=1958908079.1776896524&dt=University%20of%20Toronto&auid=756654314.1776896524&navt=n&npa=1&_tu=KA&gtm=45be64k0z8859234634za20gzb859234634zd859234634xea&gcd=13l3l3l2l1l1&dma_cps=a&dma=1&tag_exp=0~115938465~115938469~117266400&apve=1&apvf=f&apvc=0&tids=AW-755633847&tid=AW-755633847&tft=1776896524191&tfd=1047 — 200 — 21 B — 39 ms — h3https://adservice.google.com/ddm/fls/z/dc_pre=CMfV_7C_gpQDFQGwJwIdhGAj4g;src=10488607;type=insul0;cat=2020_0;rcb=1;ord=1;num=1294871669232;npa=1;auiddc=*;uaa=x86;uab=64;uafvl=Chromium%3B147.0.7727.101%7CNot.A%252FBrand%3B8.0.0.0;uamb=0;uam=;uap=macOS;uapv=10.15.7;uaw=0;pscdl=noapi;frm=0;_tu=KJA;gtm=45fe64k0v9190059841z8859234634za20gzb859234634zd859234634xea;gcd=13l3l3l2l1l1;dma_cps=a;dma=1;dc_fmt=2;tag_exp=0~115938465~115938469~117266400;epver=2;dc_random=1776896524_nqx-nguFAqydHRChJlDsgss1cqh5dznP1Q;_dc_test=1;~oref=https%3A%2F%2Fwww.utoronto.ca%2Fadservice.google.com/ddm/fls/z/dc_p... https://adservice.google.com/ddm/fls/z/dc_pre=CMfV_7C_gpQDFQGwJwIdhGAj4g;src=10488607;type=insul0;cat=2020_0;rcb=1;ord=1;num=1294871669232;npa=1;auiddc=*;uaa=x86;uab=64;uafvl=Chromium%3B147.0.7727.101%7CNot.A%252FBrand%3B8.0.0.0;uamb=0;uam=;uap=macOS;uapv=10.15.7;uaw=0;pscdl=noapi;frm=0;_tu=KJA;gtm=45fe64k0v9190059841z8859234634za20gzb859234634zd859234634xea;gcd=13l3l3l2l1l1;dma_cps=a;dma=1;dc_fmt=2;tag_exp=0~115938465~115938469~117266400;epver=2;dc_random=1776896524_nqx-nguFAqydHRChJlDsgss1cqh5dznP1Q;_dc_test=1;~oref=https%3A%2F%2Fwww.utoronto.ca%2F — 200 — 63 B — 90 ms — h3https://www.google.com/gmp/conversion/_dc_unique_id=16317039999508195323;_dc_ptd=ChAI8OOhzwYQtuXPktuMwIx7Eh8Actxh4JG_sF34kVjJpMvbytTRpwvS8rtBVDnILKny;_dc_time=1776896524;dc_pre=CKLo_bC_gpQDFWlB9ggd2wwINw;src=10488607;type=insul0;cat=2020_0;rcb=1;ord=1;num=1294871669232;npa=1;auiddc=756654314.1776896524;uaa=x86;uab=64;uafvl=Chromium%3B147.0.7727.101%7CNot.A%252FBrand%3B8.0.0.0;uamb=0;uam=;uap=macOS;uapv=10.15.7;uaw=0;pscdl=noapi;frm=0;_tu=KJA;gtm=45fe64k0v9190059841z8859234634za20gzb859234634zd859234634xea;gcd=13l3l3l2l1l1;dma_cps=a;dma=1;dc_fmt=3;tag_exp=0~115938465~115938469~117266400;epver=2;dc_random=1776896524_nqx-nguFAqydHRChJlDsgss1cqh5dznP1Q;~oref=https%3A%2F%2Fwww.utoronto.ca%2F?www.google.com/gmp/conversion/_dc_u... https://www.google.com/gmp/conversion/_dc_unique_id=16317039999508195323;_dc_ptd=ChAI8OOhzwYQtuXPktuMwIx7Eh8Actxh4JG_sF34kVjJpMvbytTRpwvS8rtBVDnILKny;_dc_time=1776896524;dc_pre=CKLo_bC_gpQDFWlB9ggd2wwINw;src=10488607;type=insul0;cat=2020_0;rcb=1;ord=1;num=1294871669232;npa=1;auiddc=756654314.1776896524;uaa=x86;uab=64;uafvl=Chromium%3B147.0.7727.101%7CNot.A%252FBrand%3B8.0.0.0;uamb=0;uam=;uap=macOS;uapv=10.15.7;uaw=0;pscdl=noapi;frm=0;_tu=KJA;gtm=45fe64k0v9190059841z8859234634za20gzb859234634zd859234634xea;gcd=13l3l3l2l1l1;dma_cps=a;dma=1;dc_fmt=3;tag_exp=0~115938465~115938469~117266400;epver=2;dc_random=1776896524_nqx-nguFAqydHRChJlDsgss1cqh5dznP1Q;~oref=https%3A%2F%2Fwww.utoronto.ca%2F? — 200 — 63 B — 227 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 — 10 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 — 7 ms — h2https://bam.nr-data.net/1/NRJS-27992c020635ff9e4a2?a=1041546173&v=1.313.1&to=NgBTZ0oHWEECV0xfDQ9KcFBMD1lcTHBKQxIACW1dVwJTbiBbVkIQDgldVko6eF0HUW5fBxYmXl1MFFleD1FKG1wXDFRE&rst=1214&ck=0&s=5b5fd74d8de63cb7&ref=https://www.utoronto.ca/&ptid=5d268266d2c3e77b&af=err,spa,xhr,stn,ins&ap=475&be=327&fe=855&dc=196&at=GkdQEQIdS08%3D&fsh=1&perf=%7B%22timing%22:%7B%22of%22:1776896523144,%22n%22:0,%22f%22:316,%22dn%22:318,%22dne%22:319,%22c%22:319,%22s%22:319,%22ce%22:323,%22rq%22:323,%22rp%22:328,%22rpe%22:330,%22di%22:517,%22ds%22:518,%22de%22:523,%22dc%22:1177,%22l%22:1177,%22le%22:1182%7D,%22navigation%22:%7B%7D%7D&fp=500&fcp=500bam.nr-data.net/1/NRJS-27992c020635... https://bam.nr-data.net/1/NRJS-27992c020635ff9e4a2?a=1041546173&v=1.313.1&to=NgBTZ0oHWEECV0xfDQ9KcFBMD1lcTHBKQxIACW1dVwJTbiBbVkIQDgldVko6eF0HUW5fBxYmXl1MFFleD1FKG1wXDFRE&rst=1214&ck=0&s=5b5fd74d8de63cb7&ref=https://www.utoronto.ca/&ptid=5d268266d2c3e77b&af=err,spa,xhr,stn,ins&ap=475&be=327&fe=855&dc=196&at=GkdQEQIdS08%3D&fsh=1&perf=%7B%22timing%22:%7B%22of%22:1776896523144,%22n%22:0,%22f%22:316,%22dn%22:318,%22dne%22:319,%22c%22:319,%22s%22:319,%22ce%22:323,%22rq%22:323,%22rp%22:328,%22rpe%22:330,%22di%22:517,%22ds%22:518,%22de%22:523,%22dc%22:1177,%22l%22:1177,%22le%22:1182%7D,%22navigation%22:%7B%7D%7D&fp=500&fcp=500 — 200 — 727 B — 138 ms — http/1.1https://k.clarity.ms/collectk.clarity.ms/collect https://k.clarity.ms/collect — 204 — 279 B — 442 ms — http/1.1https://bam.nr-data.net/events/1/NRJS-27992c020635ff9e4a2?a=1041546173&v=1.313.1&to=NgBTZ0oHWEECV0xfDQ9KcFBMD1lcTHBKQxIACW1dVwJTbiBbVkIQDgldVko6eF0HUW5fBxYmXl1MFFleD1FKG1wXDFRE&rst=1362&ck=0&s=5b5fd74d8de63cb7&ref=https://www.utoronto.ca/&ptid=5d268266d2c3e77bbam.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=1362&ck=0&s=5b5fd74d8de63cb7&ref=https://www.utoronto.ca/&ptid=5d268266d2c3e77b — 200 — 417 B — 107 ms — http/1.1https://bam.nr-data.net/jserrors/1/NRJS-27992c020635ff9e4a2?a=1041546173&v=1.313.1&to=NgBTZ0oHWEECV0xfDQ9KcFBMD1lcTHBKQxIACW1dVwJTbiBbVkIQDgldVko6eF0HUW5fBxYmXl1MFFleD1FKG1wXDFRE&rst=1364&ck=0&s=5b5fd74d8de63cb7&ref=https://www.utoronto.ca/&ptid=5d268266d2c3e77bbam.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=1364&ck=0&s=5b5fd74d8de63cb7&ref=https://www.utoronto.ca/&ptid=5d268266d2c3e77b — 200 — 417 B — 103 ms — http/1.1https://bam.nr-data.net/events/1/NRJS-27992c020635ff9e4a2?a=1041546173&v=1.313.1&to=NgBTZ0oHWEECV0xfDQ9KcFBMD1lcTHBKQxIACW1dVwJTbiBbVkIQDgldVko6eF0HUW5fBxYmXl1MFFleD1FKG1wXDFRE&rst=1365&ck=0&s=5b5fd74d8de63cb7&ref=https://www.utoronto.ca/&ptid=5d268266d2c3e77bbam.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=1365&ck=0&s=5b5fd74d8de63cb7&ref=https://www.utoronto.ca/&ptid=5d268266d2c3e77b — 200 — 417 B — 128 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 725ms · 586KB · CA$10/mo
www.utoronto.ca
Other
Costly
Execution 258ms
Transfer 68 KB
Unused 73%
Monthly Cost CA$4/mo
www.utoronto.ca
Other
Optional
Execution 123ms
Transfer 41 KB
Monthly Cost CA$2/mo
Unattributable
Other
Optional
Execution 81ms
Transfer 0 KB
Monthly Cost CA$1/mo
Google Tag Manager
Tag Manager
Optional
Execution 79ms
Transfer 164 KB
Unused 40%
Monthly Cost CA$1/mo
Google Tag Manager
Tag Manager
Optional
Execution 71ms
Transfer 158 KB
Unused 42%
Monthly Cost CA$1/mo
Microsoft Clarity
Session Replay
Optional
Execution 61ms
Transfer 26 KB
Monthly Cost CA$1/mo
Google Tag Manager
Tag Manager
Optional
Execution 52ms
Transfer 129 KB
Unused 43%
Monthly Cost CA$1/mo

These scripts may cost more than they're worth

  • www.utoronto.ca adds 258ms and costs ~CA$4/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 258ms 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

73% 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

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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