Performance
· 17 checks — Lighthouse + waterfall + sustainability rolled into one auditable list.Performance-focused optimization plan with CWV assessment, top offenders, and time estimates
First Contentful Paint First Contentful Paint — how long until the browser renders the first piece of content. Under 1.8s is good.
5.20 s
Largest Contentful Paint Largest Contentful Paint — how long until the largest visible element loads. Under 2.5s is good.
11.09 s
Total Blocking Time Total Blocking Time — total time the main thread was blocked, preventing user input. Under 200ms is good.
509 ms
Cumulative Layout Shift Cumulative Layout Shift — measures visual stability. How much the page layout shifts during loading. Under 0.1 is good.
0.092
Speed Index Speed Index — how quickly content is visually displayed during load. Under 3.4s is good.
6.78 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.
21.85 s
Page Load Progression
FPage Weight BudgetAction5.3 MB transferred, 69 requestsFIX
Convert images to WebP/AVIF and resize to display dimensions to reduce transfer size.
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.
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.
Font payload is large — subset to used glyphs only, or fall back to system fonts (zero load time).
Source: web.dev font loading
DThird-Party ImpactAction100% third-party, 0 ms blockingFIX
DJS Execution CostAction3379ms total JS executionFIX
Main Thread Breakdown
| Script | Total | Scripting | Parse/Compile | Party |
|---|---|---|---|---|
| Unattributable | 662ms | 11ms | 0ms | 3rd |
| https://www.ulaval.ca/ | 652ms | 14ms | 2ms | 3rd |
| https://www.ulaval.ca/core/assets/vendor/jquery/jquery.min.js?v=4.0.0 | 548ms | 329ms | 9ms | 3rd |
| https://www.googletagmanager.com/gtag/js?id=G-SWH36WQNNE&cx=c>m=4e64k0 | 467ms | 405ms | 58ms | 3rd |
| https://www.googletagmanager.com/gtm.js?id=GTM-K3LH6PX | 422ms | 361ms | 52ms | 3rd |
| https://cdn.cookie-script.com/s/13098d3840090d1881a13c6e088c3ca2.js | 323ms | 212ms | 31ms | 3rd |
| https://www.googletagmanager.com/gtag/js?id=DC-13561544&cx=c>m=4e64k0 | 164ms | 125ms | 37ms | 3rd |
| https://www.ulaval.ca/sites/default/files/assets/css/css_s49mXH1gItmmBaPzLvOVlbouDK-PerXvxkppzVBbxhk.css?delta=1&language=fr&theme=ulaval&include=eJxNzEEOgCAMBMAPIbxpgUZICjSUavy9XjRe5zCCiX1CioY8TcBePvHWxSJXLZSdXrqohQglZ4wDHNJoMhR9kW5Rz5dl1p7qU_1h3ZaRKVg | 74ms | 0ms | 0ms | 3rd |
| https://www.ulaval.ca/sites/default/files/assets/js/js_28u1HAP7FSDlOODMJ6LUOBJP9vtx0Sog5YalW_RzoTM.js?scope=header&delta=14&language=fr&theme=ulaval&include=eJx1zkEKwzAMBMAPVfRNilhSEUU2ku2SvL6B4tBLD2LZ2Yu68WB7Lsbn8eg_hdS1TZGy15LsDUlLvifDV3UKyAtx3eQa6qKVbUKCr53Y2Y6mkrebykbCEaUnjKQMxL8Rhh1-v_QN8tIHzJAfwRJOKw | 68ms | 54ms | 7ms | 3rd |
DPage Weight InventoryAction69 resources · 5.3 MB · 230 KB savings availableFIX
~230.3 KiB of savings available
| # | Resource | Type | Size | Cache | Unused | 3rd party | Issues |
|---|---|---|---|---|---|---|---|
| — | — | ||||||
| 69 resources | 5.3 MiB | ||||||
CImage OptimizationAction24 images, 0 KB saveableREVIEW
Set explicit width and height to prevent CLS.
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.
Image without explicit width/height — browser can't reserve space; CLS jumps when image loads.
Source: web.dev / Core Web Vitals
CJS BundlesAction26 scripts, 230 KB unusedREVIEW
Downloaded but never executed on this page.
| Script | Size | Unused | Minified | Party |
|---|---|---|---|---|
| https://www.googletagmanager.com/gtag/js?id=G-SWH36WQNNE&cx=c>m=4e64k0 | 175 KB | 72 KB (41%) | ✓ | 3rd |
| https://www.googletagmanager.com/gtm.js?id=GTM-K3LH6PX | 170 KB | 67 KB (40%) | ✓ | 3rd |
| https://www.googletagmanager.com/gtag/js?id=DC-13561544&cx=c>m=4e64k0 | 129 KB | 64 KB (49%) | ✓ | 3rd |
| https://www.ulaval.ca/core/assets/vendor/jquery/jquery.min.js?v=4.0.0 | 77 KB | 28 KB (36%) | ✓ | 3rd |
| https://www.ulaval.ca/themes/ulaval_templates/assets/ulaval/js/blazy-init.js?tdvcf9 | 1 KB | — | ✓ | 3rd |
| https://www.ulaval.ca/sites/default/files/assets/js/js_28u1HAP7FSDlOODMJ6LUOBJP9vtx0Sog5YalW_RzoTM.js?scope=header&delta=14&language=fr&theme=ulaval&include=eJx1zkEKwzAMBMAPVfRNilhSEUU2ku2SvL6B4tBLD2LZ2Yu68WB7Lsbn8eg_hdS1TZGy15LsDUlLvifDV3UKyAtx3eQa6qKVbUKCr53Y2Y6mkrebykbCEaUnjKQMxL8Rhh1-v_QN8tIHzJAfwRJOKw | 19 KB | — | ✓ | 3rd |
| https://www.ulaval.ca/sites/default/files/assets/js/js__hOv_1TjE-vDWf2p76Iy9onQWSgIlgp9w0EN8UnKkWU.js?scope=header&delta=16&language=fr&theme=ulaval&include=eJx1zkEKwzAMBMAPVfRNilhSEUU2ku2SvL6B4tBLD2LZ2Yu68WB7Lsbn8eg_hdS1TZGy15LsDUlLvifDV3UKyAtx3eQa6qKVbUKCr53Y2Y6mkrebykbCEaUnjKQMxL8Rhh1-v_QN8tIHzJAfwRJOKw | 1 KB | — | ✓ | 3rd |
| https://www.ulaval.ca/themes/ulaval_templates/assets/ulaval/librairies-externes/blazy/blazy.min.js?tdvcf9 | 6 KB | — | ✓ | 3rd |
| https://www.ulaval.ca/themes/ulaval_templates/assets/ulaval/js/boite-contenu-cache.js?tdvcf9 | 2 KB | — | ✓ | 3rd |
| https://www.ulaval.ca/themes/ulaval_templates/assets/ulaval/js/filtersAjaxWatcher.js?tdvcf9 | 3 KB | — | ✓ | 3rd |
Consider code splitting or tree shaking to reduce unused code.
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.
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.
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.
This bundle has high unused code — code-split or tree-shake to ship only what executes.
Source: web.dev / Lighthouse coverage
CGreen HostingActionWhether the site is served from green-energy infrastructureREVIEW
Green Hosting
No green hosting detected
A+Text CompressionAll text resources are compressedPASS
A+Font Loading4 fonts (331 KB)PASS
Web fonts
4
331 KB total
Render-blocking
0
of 4
Dominant font-display
swap
Most common across fonts
Font loading timeline
- Subset this font — over 100 KB suggests Latin Extended or full glyph coverage that most pages don't need
- Subset this font — over 100 KB suggests Latin Extended or full glyph coverage that most pages don't need
- Subset this font — over 100 KB suggests Latin Extended or full glyph coverage that most pages don't need
- Convert to woff2 for ~30% smaller file size
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 ~164 KB and ~328 ms
A+Resource CachingAll resources properly cachedPASS
A+Critical Rendering PathNo render-blocking resourcesPASS
A+Resource Hints2 hints, 0 missing preconnectsPASS
Current Resource Hints
2 resource hints configured
A+Render-Blocking ResourcesNo render-blocking resources detectedPASS
A+Third-Party ResourcesNo third-party resources detectedPASS
AHTTP Cachingmax-age=31536000 (52 weeks)PASS
max-age=31536000
| Directive | Value | Meaning |
|---|---|---|
| max-age | 31536000 | Cache for 52 weeks |
Network Waterfall69 requests over 3053msINFO
Third-Party Script CostPer-script blocking time, transfer cost, and cache headersINFO
| Script | Category | Execution | Transfer | Unused | Monthly Cost | Verdict |
|---|---|---|---|---|---|---|
Unattributable Unattributable | Other | 662ms | 0 KB | — | CA$9/mo | Costly |
www.ulaval.ca www.ulaval.ca | Other | 652ms | 130 KB | — | CA$9/mo | Costly |
www.ulaval.ca www.ulaval.ca | Other | 548ms | 77 KB | 36% | CA$8/mo | Costly |
Google Tag Manager www.googletagmanager.com | Tag Manager | 467ms | 175 KB | 41% | CA$6/mo | Costly |
Google Tag Manager www.googletagmanager.com | Tag Manager | 422ms | 170 KB | 40% | CA$6/mo | Costly |
Cookie Script cdn.cookie-script.com | Consent | 323ms | 41 KB | — | CA$4/mo | Essential |
Google Tag Manager www.googletagmanager.com | Tag Manager | 164ms | 129 KB | 49% | CA$2/mo | Optional |
www.ulaval.ca www.ulaval.ca | Other | 74ms | 61 KB | — | CA$1/mo | Optional |
www.ulaval.ca www.ulaval.ca | Other | 68ms | 19 KB | — | CA$1/mo | Optional |
These scripts may cost more than they're worth
- Unattributable adds 662ms and costs ~CA$9/month
- www.ulaval.ca adds 652ms and costs ~CA$9/month
- www.ulaval.ca adds 548ms and costs ~CA$8/month
- Google Tag Manager adds 467ms and costs ~CA$6/month
- Google Tag Manager adds 422ms and costs ~CA$6/month
100% of JavaScript execution time is spent on third-party scripts. Consider auditing which scripts are essential.
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
Unattributable takes 662ms of CPU time. Consider loading it asynchronously or replacing it with a lighter alternative.
This script has high main-thread execution time — optimize hot paths or defer.
Source: web.dev
www.ulaval.ca takes 652ms of CPU time. Consider loading it asynchronously or replacing it with a lighter alternative.
This script has high main-thread execution time — optimize hot paths or defer.
Source: web.dev
www.ulaval.ca takes 548ms of CPU time. Consider loading it asynchronously or replacing it with a lighter alternative.
This script has high main-thread execution time — optimize hot paths or defer.
Source: web.dev
Google Tag Manager takes 467ms of CPU time. Consider loading it asynchronously or replacing it with a lighter alternative.
This script has high main-thread execution time — optimize hot paths or defer.
Source: web.dev
Google Tag Manager takes 422ms of CPU time. Consider loading it asynchronously or replacing it with a lighter alternative.
This script has high main-thread execution time — optimize hot paths or defer.
Source: web.dev