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.
10.40 s
Largest Contentful Paint Largest Contentful Paint — how long until the largest visible element loads. Under 2.5s is good.
18.25 s
Total Blocking Time Total Blocking Time — total time the main thread was blocked, preventing user input. Under 200ms is good.
664 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.
10.40 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.
18.34 s
Page Load Progression
DPage Weight BudgetAction2.4 MB transferred, 99 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
DThird-Party ImpactAction100% third-party, 0 ms blockingFIX
DJS Execution CostAction3073ms total JS executionFIX
Main Thread Breakdown
| Script | Total | Scripting | Parse/Compile | Party |
|---|---|---|---|---|
| Unattributable | 626ms | 51ms | 0ms | 3rd |
| https://www.uoregon.edu/sites/default/files/js/js_eZTqQKi949bKPIGZTlZV-7jcUVq7vqg06IIVes3wtCs.js?scope=header&delta=5&language=en&theme=uo_gateway&include=eJyFj2sKwzAMgy8UL0cKTuqadE5c8qDt7RdGt9HB2B9bEh8CBRUtXncbTmFewk6a1l7ifHyimGMzrMpCriFbHufb33DB_Rom07xLxJgod-uxkunqghayNRQVgRYTScwEq8oxR5E30BU28jBRjZxhLqNj03KHS8svKIwJQu0_-Bw2IMZGGx72_LDUB4NFb6E | 420ms | 51ms | 2ms | 3rd |
| https://www.googletagmanager.com/gtm.js?id=GTM-TWRVN2N | 404ms | 335ms | 37ms | 3rd |
| https://www.googletagmanager.com/gtag/js?id=G-29R534B4TL&cx=c>m=4e64k0h2 | 371ms | 214ms | 60ms | 3rd |
| https://scripts.clarity.ms/0.8.59/clarity.js | 240ms | 198ms | 7ms | 3rd |
| https://www.googletagmanager.com/gtag/js?id=G-9N7LL0B0D9&cx=c>m=4e64k0h2 | 223ms | 179ms | 43ms | 3rd |
| https://analytics.tiktok.com/i18n/pixel/static/main.MWE0ZWQ3ZWQwMQ.js | 204ms | 156ms | 45ms | 3rd |
| https://www.uoregon.edu/ | 199ms | 7ms | 3ms | 3rd |
| https://www.uoregon.edu/sites/default/files/js/js_g-DXtA6CDA9vDv6hVwyAQC_r4YFchNtyISBeGPj1XLg.js?scope=footer&delta=0&language=en&theme=uo_gateway&include=eJyFj2sKwzAMgy8UL0cKTuqadE5c8qDt7RdGt9HB2B9bEh8CBRUtXncbTmFewk6a1l7ifHyimGMzrMpCriFbHufb33DB_Rom07xLxJgod-uxkunqghayNRQVgRYTScwEq8oxR5E30BU28jBRjZxhLqNj03KHS8svKIwJQu0_-Bw2IMZGGx72_LDUB4NFb6E | 120ms | 90ms | 16ms | 3rd |
| https://cse.google.com/cse.js?cx=005933198350176372664:riyhycsgqf4 | 83ms | 74ms | 1ms | 3rd |
Showing top 10 of 13 scripts
DJS BundlesAction22 scripts, 382 KB unusedFIX
Downloaded but never executed on this page.
| Script | Size | Unused | Minified | Party |
|---|---|---|---|---|
| https://www.googletagmanager.com/gtag/js?id=G-29R534B4TL&cx=c>m=4e64k0h2 | 169 KB | 68 KB (40%) | ✓ | 3rd |
| https://www.googletagmanager.com/gtag/js?id=G-9N7LL0B0D9&cx=c>m=4e64k0h2 | 156 KB | 67 KB (43%) | ✓ | 3rd |
| https://www.googletagmanager.com/gtm.js?id=GTM-TWRVN2N | 136 KB | 61 KB (45%) | ✓ | 3rd |
| https://analytics.tiktok.com/i18n/pixel/static/main.MWE0ZWQ3ZWQwMQ.js | 110 KB | 56 KB (52%) | ✓ | 3rd |
| https://www.google.com/cse/static/element/dc329f57de078f5d/cse_element__en.js?usqp=CAM%3D | 103 KB | 53 KB (52%) | ✓ | 3rd |
| https://www.uoregon.edu/sites/default/files/js/js_g-DXtA6CDA9vDv6hVwyAQC_r4YFchNtyISBeGPj1XLg.js?scope=footer&delta=0&language=en&theme=uo_gateway&include=eJyFj2sKwzAMgy8UL0cKTuqadE5c8qDt7RdGt9HB2B9bEh8CBRUtXncbTmFewk6a1l7ifHyimGMzrMpCriFbHufb33DB_Rom07xLxJgod-uxkunqghayNRQVgRYTScwEq8oxR5E30BU28jBRjZxhLqNj03KHS8svKIwJQu0_-Bw2IMZGGx72_LDUB4NFb6E | 66 KB | 45 KB (69%) | ✓ | 3rd |
| https://cse.google.com/adsense/search/async-ads.js | 44 KB | 32 KB (73%) | ✓ | 3rd |
| https://www.uoregon.edu/sites/default/files/js/js_eZTqQKi949bKPIGZTlZV-7jcUVq7vqg06IIVes3wtCs.js?scope=header&delta=5&language=en&theme=uo_gateway&include=eJyFj2sKwzAMgy8UL0cKTuqadE5c8qDt7RdGt9HB2B9bEh8CBRUtXncbTmFewk6a1l7ifHyimGMzrMpCriFbHufb33DB_Rom07xLxJgod-uxkunqghayNRQVgRYTScwEq8oxR5E30BU28jBRjZxhLqNj03KHS8svKIwJQu0_-Bw2IMZGGx72_LDUB4NFb6E | 6 KB | — | ✓ | 3rd |
| https://cdn.bc0a.com/autopilot/f00000000313636/autopilot_sdk.js | 24 KB | — | ✓ | 3rd |
| https://cse.google.com/cse.js?cx=005933198350176372664:riyhycsgqf4 | 4 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
DPage Weight InventoryAction99 resources · 2.4 MB · 382 KB savings availableFIX
~382.1 KiB of savings available
| # | Resource | Type | Size | Cache | Unused | 3rd party | Issues |
|---|---|---|---|---|---|---|---|
| — | — | ||||||
| 99 resources | 2.4 MiB | ||||||
FHTTP CachingActionNo cache headersFIX
No Cache-Control header
Adding a Cache-Control header can significantly improve repeat-visit performance.
BImage Optimization45 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
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 Loading6 fonts (620 KB)PASS
Web fonts
6
620 KB total
Render-blocking
0
of 6
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
- Subset this font — over 100 KB suggests Latin Extended or full glyph coverage that most pages don't need
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 ~258 KB and ~516 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
Network Waterfall99 requests over 2801msINFO
Third-Party Script CostPer-script blocking time, transfer cost, and cache headersINFO
| Script | Category | Execution | Transfer | Unused | Monthly Cost | Verdict |
|---|---|---|---|---|---|---|
Unattributable Unattributable | Other | 626ms | 0 KB | — | €7/mo | Costly |
www.uoregon.edu www.uoregon.edu | Other | 420ms | 6 KB | — | €5/mo | Costly |
Google Tag Manager www.googletagmanager.com | Tag Manager | 404ms | 136 KB | 45% | €4/mo | Costly |
Google Tag Manager www.googletagmanager.com | Tag Manager | 371ms | 169 KB | 40% | €4/mo | Costly |
Microsoft Clarity scripts.clarity.ms | Session Replay | 240ms | 26 KB | — | €3/mo | Costly |
Google Tag Manager www.googletagmanager.com | Tag Manager | 223ms | 156 KB | 43% | €2/mo | Costly |
analytics.tiktok.com analytics.tiktok.com | Other | 204ms | 110 KB | 52% | €2/mo | Costly |
www.uoregon.edu www.uoregon.edu | Other | 199ms | 26 KB | — | €2/mo | Optional |
www.uoregon.edu www.uoregon.edu | Other | 120ms | 66 KB | 69% | €1/mo | Optional |
cse.google.com cse.google.com | Other | 83ms | 4 KB | — | €1/mo | Optional |
cdn.uoregon.edu cdn.uoregon.edu | Other | 69ms | 70 KB | — | €1/mo | Optional |
www.google.com www.google.com | Other | 63ms | 103 KB | 52% | €1/mo | Optional |
cdn.bc0a.com cdn.bc0a.com | Other | 52ms | 24 KB | — | €1/mo | Optional |
These scripts may cost more than they're worth
- Unattributable adds 626ms and costs ~€7/month
- www.uoregon.edu adds 420ms and costs ~€5/month
- Google Tag Manager adds 404ms and costs ~€4/month
- Google Tag Manager adds 371ms and costs ~€4/month
- Microsoft Clarity adds 240ms and costs ~€3/month
- Google Tag Manager adds 223ms and costs ~€2/month
- analytics.tiktok.com adds 204ms and costs ~€2/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 626ms 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.uoregon.edu takes 420ms 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 404ms 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 371ms 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 240ms 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 223ms 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
analytics.tiktok.com takes 204ms 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
52% of analytics.tiktok.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
69% of www.uoregon.edu'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
52% of www.google.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