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.
8.99 s
Largest Contentful Paint Largest Contentful Paint — how long until the largest visible element loads. Under 2.5s is good.
15.28 s
Total Blocking Time Total Blocking Time — total time the main thread was blocked, preventing user input. Under 200ms is good.
1.22 s
Cumulative Layout Shift Cumulative Layout Shift — measures visual stability. How much the page layout shifts during loading. Under 0.1 is good.
0.018
Speed Index Speed Index — how quickly content is visually displayed during load. Under 3.4s is good.
9.68 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.
28.45 s
Page Load Progression
816 ms 1.6 s
2.4 s
3.3 s
4.1 s 4.9 s
5.7 s
6.5 sFPage Weight BudgetAction3.6 MB transferred, 120 requestsFIX
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
Each request adds latency. Bundle small files, use sprites, or eliminate unnecessary requests.
High HTTP request count — bundling, sprite-ing, and HTTP/2 server push can reduce per-request overhead.
Source: web.dev
DThird-Party ImpactAction71% third-party, 0 ms blockingFIX
FJS Execution CostAction5215ms total JS executionFIX
Main Thread Breakdown
| Script | Total | Scripting | Parse/Compile | Party |
|---|---|---|---|---|
| https://ucalgary.ca/sites/default/homepage/files/js/js_1QFov87KF57H9ld2qVvtHcId-S-Wky3pjMuMYPb0yZM.js?scope=footer&delta=0&language=en&theme=ucws_theme&include=eJyFjNEOwiAMRX8I5ZMIKzVrVloCZezznZnGTE186r3n3BSUtU66eRIyhz2A6kK4n1yYogD6X9DhZkyy-FR7iXx9VtcsGjUjaC_zJq7DaCEK5Z2o-HM9LK4oFm6IyX_0fz4wrTjmyBh4wDjmNmNGP7HC0k5E1ZrVWEJDRrCQqpakQ06rR7zsD6t90YzS78Dcff8 | 973ms | 631ms | 27ms | 1st |
| https://ucalgary.ca/ | 632ms | 25ms | 3ms | 1st |
| https://www.googletagmanager.com/gtag/js?id=G-X4GN9Y4W7D | 545ms | 416ms | 42ms | 3rd |
| Unattributable | 463ms | 41ms | 0ms | 3rd |
| https://www.googletagmanager.com/gtm.js?id=GTM-K9DHDQH | 314ms | 255ms | 55ms | 3rd |
| https://scripts.clarity.ms/0.8.60-beta/clarity.js | 294ms | 227ms | 6ms | 3rd |
| https://www.googletagmanager.com/gtag/js?id=G-HZDE2J4REE&cx=c>m=4e64h1h1 | 274ms | 181ms | 36ms | 3rd |
| https://www.googletagmanager.com/gtag/js?id=G-5GBFLEGM04&cx=c>m=4e64h1 | 238ms | 186ms | 35ms | 3rd |
| https://www.googletagmanager.com/gtm.js?id=GTM-5FZ5QDWC | 229ms | 187ms | 37ms | 3rd |
| https://www.googletagmanager.com/gtag/js?id=DC-16658738&cx=c>m=4e64h1h1 | 205ms | 170ms | 25ms | 3rd |
Showing top 10 of 20 scripts
FJS BundlesAction30 scripts, 726 KB unusedFIX
Downloaded but never executed on this page.
| Script | Size | Unused | Minified | Party |
|---|---|---|---|---|
| https://www.googletagmanager.com/gtag/js?id=G-X4GN9Y4W7D | 174 KB | 66 KB (38%) | ✓ | 3rd |
| https://www.googletagmanager.com/gtag/js?id=G-HZDE2J4REE&cx=c>m=4e64h1h1 | 157 KB | 66 KB (42%) | ✓ | 3rd |
| https://www.googletagmanager.com/gtm.js?id=GTM-PTFSDQ5P | 116 KB | 66 KB (57%) | ✓ | 3rd |
| https://www.googletagmanager.com/gtm.js?id=GTM-K9DHDQH | 158 KB | 65 KB (41%) | ✓ | 3rd |
| https://www.googletagmanager.com/gtag/js?id=G-5GBFLEGM04&cx=c>m=4e64h1 | 157 KB | 65 KB (41%) | ✓ | 3rd |
| https://www.googletagmanager.com/gtm.js?id=GTM-5FZ5QDWC | 154 KB | 64 KB (41%) | ✓ | 3rd |
| https://www.googletagmanager.com/gtm.js?id=GTM-PSTK4ZT5 | 133 KB | 64 KB (48%) | ✓ | 3rd |
| https://www.googletagmanager.com/gtag/destination?id=DC-9811133&cx=c>m=4e64h1h1 | 129 KB | 62 KB (48%) | ✓ | 3rd |
| https://www.googletagmanager.com/gtag/js?id=DC-16658738&cx=c>m=4e64h1h1 | 129 KB | 56 KB (43%) | ✓ | 3rd |
| https://ucalgary.ca/sites/default/homepage/files/js/js_1QFov87KF57H9ld2qVvtHcId-S-Wky3pjMuMYPb0yZM.js?scope=footer&delta=0&language=en&theme=ucws_theme&include=eJyFjNEOwiAMRX8I5ZMIKzVrVloCZezznZnGTE186r3n3BSUtU66eRIyhz2A6kK4n1yYogD6X9DhZkyy-FR7iXx9VtcsGjUjaC_zJq7DaCEK5Z2o-HM9LK4oFm6IyX_0fz4wrTjmyBh4wDjmNmNGP7HC0k5E1ZrVWEJDRrCQqpakQ06rR7zsD6t90YzS78Dcff8 | 103 KB | 51 KB (49%) | ✓ | 1st |
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
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
FPage Weight InventoryAction120 resources · 3.6 MB · 726 KB savings availableFIX
~726.4 KiB of savings available
| # | Resource | Type | Size | Cache | Unused | 3rd party | Issues |
|---|---|---|---|---|---|---|---|
| — | — | ||||||
| 120 resources | 3.6 MiB | ||||||
BImage Optimization25 images, 0 KB saveableREVIEW
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 Loading13 fonts (527 KB)PASS
Web fonts
13
527 KB total
Render-blocking
0
of 13
Dominant font-display
swap
Most common across fonts
Font loading timeline
- 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 ~2 KB and ~4 ms
A+Resource CachingAll resources properly cachedPASS
A+Critical Rendering PathNo render-blocking resourcesPASS
A+Resource HintsNo optimization neededPASS
A+Render-Blocking ResourcesNo render-blocking resources detectedPASS
A+Third-Party ResourcesNo third-party resources detectedPASS
A+HTTP Cachingmax-age=180 (3 minutes)PASS
max-age=180, public
| Directive | Value | Meaning |
|---|---|---|
| max-age | 180 | Cache for 3 minutes |
| public | — | Any cache may store this response |
Network Waterfall120 requests over 4253msINFO
Third-Party Script CostPer-script blocking time, transfer cost, and cache headersINFO
| Script | Category | Execution | Transfer | Unused | Monthly Cost | Verdict |
|---|---|---|---|---|---|---|
Google Tag Manager www.googletagmanager.com | Tag Manager | 545ms | 174 KB | 38% | CA$8/mo | Costly |
Unattributable Unattributable | Other | 463ms | 0 KB | — | CA$6/mo | Costly |
Google Tag Manager www.googletagmanager.com | Tag Manager | 314ms | 158 KB | 41% | CA$4/mo | Costly |
Microsoft Clarity scripts.clarity.ms | Session Replay | 294ms | 25 KB | — | CA$4/mo | Costly |
Google Tag Manager www.googletagmanager.com | Tag Manager | 274ms | 157 KB | 42% | CA$4/mo | Costly |
Google Tag Manager www.googletagmanager.com | Tag Manager | 238ms | 157 KB | 41% | CA$3/mo | Costly |
Google Tag Manager www.googletagmanager.com | Tag Manager | 229ms | 154 KB | 41% | CA$3/mo | Costly |
Google Tag Manager www.googletagmanager.com | Tag Manager | 205ms | 129 KB | 43% | CA$3/mo | Costly |
Google Tag Manager www.googletagmanager.com | Tag Manager | 174ms | 133 KB | 48% | CA$2/mo | Optional |
Google Tag Manager www.googletagmanager.com | Tag Manager | 157ms | 129 KB | 48% | CA$2/mo | Optional |
events.ucalgary.ca events.ucalgary.ca | Other | 135ms | 36 KB | — | CA$2/mo | Optional |
Facebook Pixel connect.facebook.net | Advertising | 111ms | 44 KB | — | CA$2/mo | Optional |
Facebook Pixel connect.facebook.net | Advertising | 105ms | 97 KB | 35% | CA$1/mo | Optional |
Google Tag Manager www.googletagmanager.com | Tag Manager | 102ms | 116 KB | 57% | CA$1/mo | Optional |
api.useberry.com api.useberry.com | Other | 52ms | 25 KB | 88% | CA$1/mo | Optional |
These scripts may cost more than they're worth
- Google Tag Manager adds 545ms and costs ~CA$8/month
- Unattributable adds 463ms and costs ~CA$6/month
- Google Tag Manager adds 314ms and costs ~CA$4/month
- Microsoft Clarity adds 294ms and costs ~CA$4/month
- Google Tag Manager adds 274ms and costs ~CA$4/month
- Google Tag Manager adds 238ms and costs ~CA$3/month
- Google Tag Manager adds 229ms and costs ~CA$3/month
- Google Tag Manager adds 205ms and costs ~CA$3/month
65% of JavaScript execution time comes from third-party scripts.
Third-party scripts (analytics, ads, social, A/B testing) often dominate execution time — every one is a perf-and-privacy tax.
Learn more ▾ ▴
Each third-party script is a black box: you don't control when it loads, what it executes, or how much it grows. They often account for a major share of total blocking time on average sites (HTTP Archive's Web Almanac documents the trend). Audit which ones you actually need, defer the rest, and use facade patterns (lite-youtube, lite-vimeo) for embedded media.
Source: web.dev / HTTP Archive Web Almanac
Google Tag Manager takes 545ms 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
Unattributable takes 463ms 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 314ms 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
Microsoft Clarity takes 294ms 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 274ms 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 238ms 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 229ms 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 205ms 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
57% of Google Tag Manager's code is unused. The script may be loading features you don't use.
Bundle has high unused-code ratio — tree-shaking and route-splitting recover the wasted bytes.
Source: web.dev
88% of api.useberry.com's code is unused. The script may be loading features you don't use.
Bundle has high unused-code ratio — tree-shaking and route-splitting recover the wasted bytes.
Source: web.dev