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.
2.91 s
Largest Contentful Paint Largest Contentful Paint — how long until the largest visible element loads. Under 2.5s is good.
7.66 s
Total Blocking Time Total Blocking Time — total time the main thread was blocked, preventing user input. Under 200ms is good.
2.50 s
Cumulative Layout Shift Cumulative Layout Shift — measures visual stability. How much the page layout shifts during loading. Under 0.1 is good.
0.162
Speed Index Speed Index — how quickly content is visually displayed during load. Under 3.4s is good.
4.36 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.
20.44 s
Page Load Progression
FPage Weight BudgetAction2.6 MB transferred, 106 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 ImpactAction100% third-party, 0 ms blockingFIX
FJS Execution CostAction7554ms total JS executionFIX
Main Thread Breakdown
| Script | Total | Scripting | Parse/Compile | Party |
|---|---|---|---|---|
| https://www.uvic.ca/ | 1356ms | 24ms | 2ms | 3rd |
| Unattributable | 1350ms | 135ms | 0ms | 3rd |
| https://www.googletagmanager.com/gtm.js?id=GTM-KPZ6L3G | 802ms | 669ms | 90ms | 3rd |
| https://www.googletagmanager.com/gtag/js?id=G-RFHYGQWVYB&cx=c>m=4e64h1 | 605ms | 508ms | 91ms | 3rd |
| https://www.googletagmanager.com/gtag/js?id=G-M6GDR2DPK1&cx=c>m=4e64h1 | 576ms | 391ms | 87ms | 3rd |
| https://www.googletagmanager.com/gtag/js?id=AW-988751457&cx=c>m=4e64h1 | 497ms | 362ms | 132ms | 3rd |
| https://www.googletagmanager.com/gtag/js?id=G-S3BQ5P9335&cx=c>m=4e64h1 | 468ms | 378ms | 86ms | 3rd |
| https://www.googletagmanager.com/gtag/js?id=AW-16599159446&cx=c>m=4e64h1 | 449ms | 373ms | 72ms | 3rd |
| https://www.uvic.ca/assets/core-4-1/js/scripts.1753207015.js | 270ms | 214ms | 28ms | 3rd |
| https://sc-static.net/scevent.min.js | 269ms | 231ms | 10ms | 3rd |
Showing top 10 of 15 scripts
DJS BundlesAction19 scripts, 433 KB unusedFIX
Downloaded but never executed on this page.
| Script | Size | Unused | Minified | Party |
|---|---|---|---|---|
| https://www.googletagmanager.com/gtag/js?id=G-M6GDR2DPK1&cx=c>m=4e64h1 | 172 KB | 69 KB (40%) | ✓ | 3rd |
| https://www.googletagmanager.com/gtag/js?id=G-S3BQ5P9335&cx=c>m=4e64h1 | 172 KB | 68 KB (39%) | ✓ | 3rd |
| https://www.googletagmanager.com/gtag/js?id=G-RFHYGQWVYB&cx=c>m=4e64h1 | 175 KB | 64 KB (37%) | ✓ | 3rd |
| https://www.googletagmanager.com/gtm.js?id=GTM-KPZ6L3G | 165 KB | 61 KB (37%) | ✓ | 3rd |
| https://www.googletagmanager.com/gtag/js?id=AW-16599159446&cx=c>m=4e64h1 | 146 KB | 56 KB (38%) | ✓ | 3rd |
| https://www.googletagmanager.com/gtag/js?id=AW-988751457&cx=c>m=4e64h1 | 147 KB | 54 KB (37%) | ✓ | 3rd |
| https://connect.facebook.net/en_US/fbevents.js | 97 KB | 33 KB (34%) | ✓ | 3rd |
| https://www.uvic.ca/assets/core-4-1/js/scripts.1753207015.js | 42 KB | 28 KB (67%) | ✓ | 3rd |
| https://sc-static.net/scevent.min.js | 25 KB | — | ✓ | 3rd |
| https://snap.licdn.com/li.lms-analytics/insight.min.js | 19 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
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 InventoryAction106 resources · 2.6 MB · 433 KB savings availableFIX
~432.8 KiB of savings available
| # | Resource | Type | Size | Cache | Unused | 3rd party | Issues |
|---|---|---|---|---|---|---|---|
| — | — | ||||||
| 106 resources | 2.6 MiB | ||||||
FHTTP CachingActionNo cache headersFIX
No Cache-Control header
Adding a Cache-Control header can significantly improve repeat-visit performance.
CImage OptimizationAction30 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
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
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 Loading19 fonts (362 KB)PASS
Web fonts
19
362 KB total
Render-blocking
0
of 19
Dominant font-display
swap
Most common across fonts
Font loading timeline
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 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
Network Waterfall106 requests over 3721msINFO
Third-Party Script CostPer-script blocking time, transfer cost, and cache headersINFO
| Script | Category | Execution | Transfer | Unused | Monthly Cost | Verdict |
|---|---|---|---|---|---|---|
www.uvic.ca www.uvic.ca | Other | 1356ms | 13 KB | — | CA$19/mo | Costly |
Unattributable Unattributable | Other | 1350ms | 0 KB | — | CA$19/mo | Costly |
Google Tag Manager www.googletagmanager.com | Tag Manager | 802ms | 165 KB | 37% | CA$11/mo | Costly |
Google Tag Manager www.googletagmanager.com | Tag Manager | 605ms | 175 KB | 37% | CA$8/mo | Costly |
Google Tag Manager www.googletagmanager.com | Tag Manager | 576ms | 172 KB | 40% | CA$8/mo | Costly |
Google Tag Manager www.googletagmanager.com | Tag Manager | 497ms | 147 KB | 37% | CA$7/mo | Costly |
Google Tag Manager www.googletagmanager.com | Tag Manager | 468ms | 172 KB | 39% | CA$6/mo | Costly |
Google Tag Manager www.googletagmanager.com | Tag Manager | 449ms | 146 KB | 38% | CA$6/mo | Costly |
www.uvic.ca www.uvic.ca | Other | 270ms | 42 KB | 67% | CA$4/mo | Costly |
sc-static.net sc-static.net | Other | 269ms | 25 KB | — | CA$4/mo | Costly |
Facebook Pixel connect.facebook.net | Advertising | 242ms | 97 KB | 34% | CA$3/mo | Costly |
Facebook Pixel connect.facebook.net | Advertising | 232ms | 47 KB | — | CA$3/mo | Costly |
LinkedIn Insight snap.licdn.com | Advertising | 201ms | 19 KB | — | CA$3/mo | Costly |
tags.srv.stackadapt.com tags.srv.stackadapt.com | Other | 155ms | 8 KB | — | CA$2/mo | Optional |
www.redditstatic.com www.redditstatic.com | Other | 85ms | 19 KB | — | CA$1/mo | Optional |
These scripts may cost more than they're worth
- www.uvic.ca adds 1356ms and costs ~CA$19/month
- Unattributable adds 1350ms and costs ~CA$19/month
- Google Tag Manager adds 802ms and costs ~CA$11/month
- Google Tag Manager adds 605ms and costs ~CA$8/month
- Google Tag Manager adds 576ms and costs ~CA$8/month
- Google Tag Manager adds 497ms and costs ~CA$7/month
- Google Tag Manager adds 468ms and costs ~CA$6/month
- Google Tag Manager adds 449ms and costs ~CA$6/month
- www.uvic.ca adds 270ms and costs ~CA$4/month
- sc-static.net adds 269ms and costs ~CA$4/month
- Facebook Pixel adds 242ms and costs ~CA$3/month
- Facebook Pixel adds 232ms and costs ~CA$3/month
- LinkedIn Insight adds 201ms and costs ~CA$3/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
www.uvic.ca takes 1356ms 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 1350ms 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 802ms 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 605ms 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 576ms 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 497ms 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 468ms 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 449ms 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.uvic.ca takes 270ms 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
67% of www.uvic.ca'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
sc-static.net takes 269ms 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
Facebook Pixel takes 242ms 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
Facebook Pixel takes 232ms 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
LinkedIn Insight takes 201ms 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