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https://queensu.ca

Performance

· 17 checks — Lighthouse + waterfall + sustainability rolled into one auditable list.
SCORE
84
GRADE
B
FIX
3
REVIEW
4
PASS
8
INFO
2

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

Mobile Desktop
45
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.

4.60 s

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

10.04 s

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

630 ms

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

0.000

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

5.81 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.

10.07 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
8 PASS 4 REVIEW 3 FIX
D
Third-Party Impact
Action
100% third-party, 0 ms blocking
FIX
100% third-party, 0 ms blocking
Warning::
Third-party code accounts for 100% of page weight (1.1 MiB of 1.1 MiB)
Info::
Third-party blocking time is low (0 ms)
100%
First-party Third-party
D
JS Execution Cost
Action
3243ms total JS execution
FIX
3243ms total JS execution
Warning::
https://www.queensu.ca/: 1048ms CPU time
Warning::
Unattributable: 692ms CPU time
Warning::
https://www.googletagmanager.com/gtm.js?id=GTM-N44...: 497ms CPU time
Warning::
https://www.googletagmanager.com/gtag/js?id=G-6L47...: 372ms CPU time
Info::
https://www.queensu.ca/sites/homesitewww/files/js/...: 215ms CPU time
Warning::
Third-party scripts: 3243ms (100% of total)

Main Thread Breakdown

Script Evaluation 40% Other 29% Style & Layout 20% Script Parsing & Compilation 5%
ScriptTotalScriptingParse/CompileParty
https://www.queensu.ca/1048ms28ms1ms3rd
Unattributable692ms81ms0ms3rd
https://www.googletagmanager.com/gtm.js?id=GTM-N44DLBQ497ms401ms45ms3rd
https://www.googletagmanager.com/gtag/js?id=G-6L47ECQV5K&cx=c&gtm=4e64h1372ms318ms50ms3rd
https://www.queensu.ca/sites/homesitewww/files/js/js_0DZWWdUoL_39ujNpVcxBqz1QEpKi5lL_3lXva1LQMiQ.js?scope=header&delta=1&language=en&theme=charlie_theme&include=eJxljuEOwjAIhF-IrI_UsIKsjhWlnZlvbxc1cfMP4bvccSA9UCQuRiHVGokv7IBX3KIaEnv42Yc2uY1jN6QJXTPHNvHCQdRGVEjmHMjXG-pAGdVk2MPQLS5c0jOisrcazgLw1jSX-Rv-IIiZaC9BCdLHmd_XD-IC9zWZzZkp16RW1_7SvwQ1S4m5xL2mhgO9ANp1awE215ms111ms10ms3rd
https://www.queensu.ca/resources/libraries/reactesm/react-dom@19.2.5/es2022/client.mjs140ms123ms2ms3rd
https://kit.fontawesome.com/29201595f7.js138ms133ms2ms3rd
https://www.queensu.ca/sites/homesitewww/files/js/js_MYjaEOCu4idY34VggRpZO1a7DyHdYUBJeYPzk_bV0SQ.js?scope=footer&delta=3&language=en&theme=charlie_theme&include=eJxljuEOwjAIhF-IrI_UsIKsjhWlnZlvbxc1cfMP4bvccSA9UCQuRiHVGokv7IBX3KIaEnv42Yc2uY1jN6QJXTPHNvHCQdRGVEjmHMjXG-pAGdVk2MPQLS5c0jOisrcazgLw1jSX-Rv-IIiZaC9BCdLHmd_XD-IC9zWZzZkp16RW1_7SvwQ1S4m5xL2mhgO9ANp1awE74ms45ms28ms3rd
https://siteimproveanalytics.com/js/siteanalyze_39700.js67ms50ms15ms3rd
F
HTTP Caching
Action
No cache headers
FIX
No cache headers
Warning::
No Cache-Control header found
Browsers will use heuristic caching, which can be unpredictable. Set explicit cache headers.

No Cache-Control header

Adding a Cache-Control header can significantly improve repeat-visit performance.

B
Page Weight Budget
1.1 MB transferred, 60 requests
REVIEW
1.1 MB transferred, 60 requests
Info::
Page weighs 3.4 MB (1.1 MB transferred)
Warning::
JavaScript is 545 KB — consider code splitting or lazy loading
Large JavaScript bundles delay interactivity. Split code by route or defer non-critical scripts.
Got: 545 KB
Info::
Fonts are 213 KB — consider subsetting or using system fonts
Subset fonts to include only used characters, or switch to system font stacks.
Got: 213 KB
Info::
60 HTTP requests
Info::
Estimated 0.22 g CO2 per page load
1.1 MB / 2.4 MB budget
1.1 MB transferred
60 requests
0.22 g CO2 per page load
JavaScript 545.5 KiB 50%
Fonts 213.3 KiB 20%
Images 143.2 KiB 13%
Other 99.3 KiB 9%
CSS 69.3 KiB 6%
HTML 13.2 KiB 1%
Other 3.7 KiB 0%
Other 549 B 0%
Other 545 B 0%
0 2.4 MB 4.9 MB
Under budget

Large JavaScript bundles delay interactivity. Split code by route or defer non-critical scripts.

Why this matters

JavaScript bundle is large — code-split routes and lazy-load off-screen components to defer.

Source: web.dev

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
11 images, 0 KB saveable
REVIEW
11 images, 0 KB saveable
Warning::
https://www.queensu.ca/resources/assets/logos/Quee... is missing width/height — may cause layout shift
Set explicit width and height to prevent CLS.
Warning::
https://www.queensu.ca/sites/homesitewww/files/sty... is missing width/height — may cause layout shift
Set explicit width and height to prevent CLS.
Warning::
https://www.queensu.ca/sites/homesitewww/files/sty... 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.
Warning::
https://www.queensu.ca/sites/homesitewww/files/sty... is missing width/height — may cause layout shift
Set explicit width and height to prevent CLS.
Warning::
https://www.queensu.ca/sites/homesitewww/files/sty... is missing width/height — may cause layout shift
Set explicit width and height to prevent CLS.
Warning::
https://www.queensu.ca/sites/homesitewww/files/sty... is missing width/height — may cause layout shift
Set explicit width and height to prevent CLS.
Warning::
https://www.queensu.ca/sites/homesitewww/files/sty... is missing width/height — may cause layout shift
Set explicit width and height to prevent CLS.
11 images 143 KB
0 oversized -0 KB
2 legacy format
8 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

Set explicit width and height to prevent CLS.

Why this matters

Performance issues directly impact user engagement and conversion rates.

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

Set explicit width and height to prevent CLS.

Why this matters

Image without explicit width/height — browser can't reserve space; CLS jumps when image loads.

Source: web.dev / Core Web Vitals

C
JS Bundles
Action
22 scripts, 196 KB unused
REVIEW
22 scripts, 196 KB unused
Warning::
https://www.googletagmanager.com/gtm.js?id=GTM-N44...: 61 KB unused (47%)
Consider code splitting or tree shaking to reduce unused code.
Warning::
https://www.googletagmanager.com/gtag/js?id=G-6L47...: 61 KB unused (39%)
Consider code splitting or tree shaking to reduce unused code.
Warning::
https://www.queensu.ca/sites/homesitewww/files/js/...: 48 KB unused (79%)
Consider code splitting or tree shaking to reduce unused code.
Warning::
https://www.queensu.ca/resources/libraries/reactes...: 25 KB unused (48%)
Consider code splitting or tree shaking to reduce unused code.
Info::
Total unused JavaScript: 196 KB
196 KB unused JavaScript

Downloaded but never executed on this page.

ScriptSizeUnusedMinifiedParty
https://www.googletagmanager.com/gtm.js?id=GTM-N44DLBQ132 KB61 KB (47%)✓3rd
https://www.googletagmanager.com/gtag/js?id=G-6L47ECQV5K&cx=c&gtm=4e64h1156 KB61 KB (39%)✓3rd
https://www.queensu.ca/sites/homesitewww/files/js/js_MYjaEOCu4idY34VggRpZO1a7DyHdYUBJeYPzk_bV0SQ.js?scope=footer&delta=3&language=en&theme=charlie_theme&include=eJxljuEOwjAIhF-IrI_UsIKsjhWlnZlvbxc1cfMP4bvccSA9UCQuRiHVGokv7IBX3KIaEnv42Yc2uY1jN6QJXTPHNvHCQdRGVEjmHMjXG-pAGdVk2MPQLS5c0jOisrcazgLw1jSX-Rv-IIiZaC9BCdLHmd_XD-IC9zWZzZkp16RW1_7SvwQ1S4m5xL2mhgO9ANp1awE61 KB48 KB (79%)✓3rd
https://www.queensu.ca/resources/libraries/reactesm/react-dom@19.2.5/es2022/client.mjs52 KB25 KB (48%)✓3rd
https://www.queensu.ca/themes/contrib/charlie_theme/js/bootstrap.bundle.min.js?tcfore22 KB—✓3rd
https://www.queensu.ca/resources/libraries/reactesm/react-dom@19.2.5/client1 KB—✓3rd
https://www.queensu.ca/resources/cookiedisclosure-v2/cookiedisclosure.js2 KB—✓3rd
https://www.queensu.ca/resources/signinlinks-v2/signinlinks.js1 KB—✓3rd
https://www.queensu.ca/modules/contrib/google_tag/js/gtm.js?tcfore1 KB—✓3rd
https://kit.fontawesome.com/29201595f7.js6 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

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
6 fonts (213 KB)
PASS
6 fonts (213 KB)
Info::
6 font(s) use font-display: swap (FOUT risk but functional)

Web fonts

6

213 KB total

Render-blocking

0

of 6

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 FCP 4.6 s LCP 10.0 shttps://fonts.gstatic.com/s/volkhov/v17/SlGQmQieoJcKemNecTUEhQ.woff2SlGQmQieoJcKemNecTUEhQ.... https://fonts.gstatic.com/s/volkhov/v17/SlGQmQieoJcKemNecTUEhQ.woff2 — 26.8 KiB — 15 ms — font-display: swaphttps://www.queensu.ca/resources/assets/fonts/GothamSSm-Medium_Web.woff2GothamSSm-Medium_Web.woff2 https://www.queensu.ca/resources/assets/fonts/GothamSSm-Medium_Web.woff2 — 40.1 KiB — 33 ms — font-display: swaphttps://www.queensu.ca/resources/assets/fonts/GothamSSm-Bold_Web.woff2GothamSSm-Bold_Web.woff2 https://www.queensu.ca/resources/assets/fonts/GothamSSm-Bold_Web.woff2 — 38.8 KiB — 270 ms — font-display: swaphttps://fonts.gstatic.com/s/opensans/v40/memvYaGs126MiZpBA-UvWbX2vVnXBbObj2OVTS-muw.woff2memvYaGs126MiZpBA-UvWbX... https://fonts.gstatic.com/s/opensans/v40/memvYaGs126MiZpBA-UvWbX2vVnXBbObj2OVTS-muw.woff2 — 47.1 KiB — 13 ms — font-display: swaphttps://www.queensu.ca/resources/assets/fonts/GothamSSm-Book_Web.woff2GothamSSm-Book_Web.woff2 https://www.queensu.ca/resources/assets/fonts/GothamSSm-Book_Web.woff2 — 40.2 KiB — 12 ms — font-display: swaphttps://ka-p.fontawesome.com/releases/v6.7.2/webfonts/pro-fa-light-300-12.woff2pro-fa-light-300-12.woff2 https://ka-p.fontawesome.com/releases/v6.7.2/webfonts/pro-fa-light-300-12.woff2 — 20.2 KiB — 18 ms — font-display: swap
SlGQmQieoJcKemNecTUEhQ.... woff2 swap
Size 27 KB
Load time 15 ms
Start 901 ms
Risk FOUT — text flashes from fallback to web font
GothamSSm-Medium_Web.woff2 woff2 swap
Size 40 KB
Load time 33 ms
Start 901 ms
Risk FOUT — text flashes from fallback to web font
GothamSSm-Bold_Web.woff2 woff2 swap
Size 39 KB
Load time 270 ms
Start 901 ms
Risk FOUT — text flashes from fallback to web font
memvYaGs126MiZpBA-UvWbX... woff2 swap
Size 47 KB
Load time 13 ms
Start 903 ms
Risk FOUT — text flashes from fallback to web font
GothamSSm-Book_Web.woff2 woff2 swap
Size 40 KB
Load time 12 ms
Start 903 ms
Risk FOUT — text flashes from fallback to web font
pro-fa-light-300-12.woff2 woff2 swap
Size 20 KB
Load time 18 ms
Start 955 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)
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
2 hints, 0 missing preconnects
PASS
2 hints, 0 missing preconnects
Info::
Page uses 2 resource hint(s)

Current Resource Hints

preconnect
2
preload
—
dns-prefetch
—
prefetch
—

2 resource hints configured

A
Page Weight Inventory
60 resources · 1.1 MB · 196 KB savings available
PASS
60 resources · 1.1 MB · 196 KB savings available
Warning::
Page weight 65 KB over 1MB target
Got: 1.1 MB Expected: ≤ 1 MB
Info::
~196 KB of savings available
Warning::
59 third-party resources (100% of weight)
60 resources · 1.1 MiB · 59 third-party 64.5 KiB over 1MB target
JavaScript 50% · 545.5 KiB
Font 20% · 213.3 KiB
CSS 15% · 163.2 KiB
Image 13% · 146.8 KiB
Document 1% · 13.3 KiB
Other 1% · 6.4 KiB

~195.7 KiB of savings available

Remove unused JavaScript: 195.7 KiB
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
60 requests over 1765ms
INFO
0 ms 2.0 s 4.0 s 6.0 s 8.0 s 10.0 s FCP 4.6 s LCP 10.0 shttps://queensu.ca// https://queensu.ca/ — 301 — 101 B — 197 ms — h2https://www.queensu.ca/www.queensu.ca/ https://www.queensu.ca/ — 200 — 12.5 KiB — 50 ms — h2https://www.queensu.ca/resources/emergencyalerts-v2/style.csswww.queensu.ca/resources/emergencya... https://www.queensu.ca/resources/emergencyalerts-v2/style.css — 200 — 1.6 KiB — 42 ms — h2https://www.queensu.ca/resources/cookiedisclosure-v2/style.csswww.queensu.ca/resources/cookiedisc... https://www.queensu.ca/resources/cookiedisclosure-v2/style.css — 200 — 931 B — 48 ms — h2https://www.queensu.ca/sites/homesitewww/files/css/css_0ipKatOrYdMNI2YN82VxDJKIA5jgLr7WhuZkM_TBGrM.css?delta=2&language=en&theme=charlie_theme&include=eJxljlEKxCAMRC8U9EgSNajb1LiJQnv77ceWwu7fzHsMDL7wCCyYST0-2c2qEiMppIrKjcKstJMvLBEZkij5rGsgu9yQpcBltVBPZ0AmneZ_AdAxufXt3n0rDFQsiqPabR7iVh8rcrNKGd4riWyNcrPEYuu68I_ATpu0-4hGH0dGVwowww.queensu.ca/sites/homesitewww/fi... https://www.queensu.ca/sites/homesitewww/files/css/css_0ipKatOrYdMNI2YN82VxDJKIA5jgLr7WhuZkM_TBGrM.css?delta=2&language=en&theme=charlie_theme&include=eJxljlEKxCAMRC8U9EgSNajb1LiJQnv77ceWwu7fzHsMDL7wCCyYST0-2c2qEiMppIrKjcKstJMvLBEZkij5rGsgu9yQpcBltVBPZ0AmneZ_AdAxufXt3n0rDFQsiqPabR7iVh8rcrNKGd4riWyNcrPEYuu68I_ATpu0-4hGH0dGVwo — 200 — 5.2 KiB — 344 ms — h2https://www.queensu.ca/sites/homesitewww/files/css/css_hJAsAmad_NmnK6e7suqASkWsl5K3L5cMemDEkLx74is.css?delta=3&language=en&theme=charlie_theme&include=eJxljlEKxCAMRC8U9EgSNajb1LiJQnv77ceWwu7fzHsMDL7wCCyYST0-2c2qEiMppIrKjcKstJMvLBEZkij5rGsgu9yQpcBltVBPZ0AmneZ_AdAxufXt3n0rDFQsiqPabR7iVh8rcrNKGd4riWyNcrPEYuu68I_ATpu0-4hGH0dGVwowww.queensu.ca/sites/homesitewww/fi... https://www.queensu.ca/sites/homesitewww/files/css/css_hJAsAmad_NmnK6e7suqASkWsl5K3L5cMemDEkLx74is.css?delta=3&language=en&theme=charlie_theme&include=eJxljlEKxCAMRC8U9EgSNajb1LiJQnv77ceWwu7fzHsMDL7wCCyYST0-2c2qEiMppIrKjcKstJMvLBEZkij5rGsgu9yQpcBltVBPZ0AmneZ_AdAxufXt3n0rDFQsiqPabR7iVh8rcrNKGd4riWyNcrPEYuu68I_ATpu0-4hGH0dGVwo — 200 — 1.3 KiB — 284 ms — h2https://www.queensu.ca/themes/contrib/charlie_theme/css/bootstrap3.4.1.min.css?tcforewww.queensu.ca/themes/contrib/charl... https://www.queensu.ca/themes/contrib/charlie_theme/css/bootstrap3.4.1.min.css?tcfore — 200 — 17.8 KiB — 229 ms — h2https://www.queensu.ca/themes/contrib/charlie_theme/css/drupal-bootstrap.min.css?tcforewww.queensu.ca/themes/contrib/charl... https://www.queensu.ca/themes/contrib/charlie_theme/css/drupal-bootstrap.min.css?tcfore — 200 — 3.3 KiB — 48 ms — 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HTML JavaScript CSS Images Fonts XHR/Fetch Other
Third-Party Script Cost
Per-script blocking time, transfer cost, and cache headers
INFO
100% of JavaScript execution is third-party
First-party Third-party 3243ms · 486KB · CA$45/mo
www.queensu.ca
Other
Costly
Execution 1048ms
Transfer 12 KB
Monthly Cost CA$14/mo
Unattributable
Other
Costly
Execution 692ms
Transfer 0 KB
Monthly Cost CA$10/mo
Google Tag Manager
Tag Manager
Costly
Execution 497ms
Transfer 132 KB
Unused 47%
Monthly Cost CA$7/mo
Google Tag Manager
Tag Manager
Costly
Execution 372ms
Transfer 156 KB
Unused 39%
Monthly Cost CA$5/mo
www.queensu.ca
Other
Costly
Execution 215ms
Transfer 29 KB
Monthly Cost CA$3/mo
www.queensu.ca
Other
Optional
Execution 140ms
Transfer 52 KB
Unused 48%
Monthly Cost CA$2/mo
kit.fontawesome.com
Other
Optional
Execution 138ms
Transfer 6 KB
Monthly Cost CA$2/mo
www.queensu.ca
Other
Optional
Execution 74ms
Transfer 61 KB
Unused 79%
Monthly Cost CA$1/mo
siteimproveanalytics.com
Other
Optional
Execution 67ms
Transfer 37 KB
Monthly Cost CA$1/mo

These scripts may cost more than they're worth

  • www.queensu.ca adds 1048ms and costs ~CA$14/month
  • Unattributable adds 692ms and costs ~CA$10/month
  • Google Tag Manager adds 497ms and costs ~CA$7/month
  • Google Tag Manager adds 372ms and costs ~CA$5/month
  • www.queensu.ca adds 215ms 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.queensu.ca takes 1048ms 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 692ms 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 497ms 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 372ms 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.queensu.ca takes 215ms 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

79% of www.queensu.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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