Performance
· 15 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.
1.01 s
Largest Contentful Paint Largest Contentful Paint — how long until the largest visible element loads. Under 2.5s is good.
2.14 s
Total Blocking Time Total Blocking Time — total time the main thread was blocked, preventing user input. Under 200ms is good.
18 ms
Cumulative Layout Shift Cumulative Layout Shift — measures visual stability. How much the page layout shifts during loading. Under 0.1 is good.
0.008
Speed Index Speed Index — how quickly content is visually displayed during load. Under 3.4s is good.
1.43 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.
3.26 s
Page Load Progression
FPage Weight BudgetAction4.3 MB transferred, 104 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
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
DJS BundlesAction22 scripts, 377 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=4e64h1 | 169 KB | 69 KB (41%) | ✓ | 3rd |
| https://www.googletagmanager.com/gtag/js?id=G-9N7LL0B0D9&cx=c>m=4e64h1 | 156 KB | 66 KB (42%) | ✓ | 3rd |
| https://www.googletagmanager.com/gtm.js?id=GTM-TWRVN2N | 137 KB | 61 KB (45%) | ✓ | 3rd |
| https://analytics.tiktok.com/i18n/pixel/static/main.MWE0ZWQ3ZWQwMQ.js | 110 KB | 55 KB (50%) | ✓ | 3rd |
| https://www.google.com/cse/static/element/b33cba5881f68fbf/cse_element__en.js?usqp=CAI%3D | 98 KB | 49 KB (50%) | ✓ | 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 InventoryAction104 resources · 4.3 MB · 377 KB savings availableFIX
~376.7 KiB of savings available
| # | Resource | Type | Size | Cache | Unused | 3rd party | Issues |
|---|---|---|---|---|---|---|---|
| — | — | ||||||
| 104 resources | 4.3 MiB | ||||||
FHTTP CachingActionNo cache headersFIX
No Cache-Control header
Adding a Cache-Control header can significantly improve repeat-visit performance.
BImage Optimization51 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
CJS Execution CostAction1229ms total JS executionREVIEW
Main Thread Breakdown
| Script | Total | Scripting | Parse/Compile | Party |
|---|---|---|---|---|
| https://www.uoregon.edu/ | 584ms | 2ms | 1ms | 3rd |
| Unattributable | 188ms | 3ms | 0ms | 3rd |
| https://www.googletagmanager.com/gtm.js?id=GTM-TWRVN2N | 120ms | 101ms | 10ms | 3rd |
| https://scripts.clarity.ms/0.8.59/clarity.js | 100ms | 87ms | 2ms | 3rd |
| https://www.googletagmanager.com/gtag/js?id=G-29R534B4TL&cx=c>m=4e64h1 | 68ms | 52ms | 14ms | 3rd |
| https://analytics.tiktok.com/i18n/pixel/static/main.MWE0ZWQ3ZWQwMQ.js | 62ms | 52ms | 9ms | 3rd |
| https://www.googletagmanager.com/gtag/js?id=G-9N7LL0B0D9&cx=c>m=4e64h1 | 56ms | 46ms | 10ms | 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 | 51ms | 12ms | 0ms | 3rd |
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 Loading5 fonts (466 KB)PASS
Web fonts
5
466 KB total
Render-blocking
0
of 5
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
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 ~181 KB and ~362 ms
A+Resource CachingAll resources properly cachedPASS
A+Critical Rendering PathNo render-blocking resourcesPASS
A+Resource HintsNo optimization neededPASS
Network Waterfall104 requests over 3811msINFO
Third-Party Script CostPer-script blocking time, transfer cost, and cache headersINFO
| Script | Category | Execution | Transfer | Unused | Monthly Cost | Verdict |
|---|---|---|---|---|---|---|
www.uoregon.edu www.uoregon.edu | Other | 584ms | 26 KB | — | €6/mo | Costly |
Unattributable Unattributable | Other | 188ms | 0 KB | — | €2/mo | Optional |
Google Tag Manager www.googletagmanager.com | Tag Manager | 120ms | 137 KB | 45% | €1/mo | Optional |
Microsoft Clarity scripts.clarity.ms | Session Replay | 100ms | 26 KB | — | €1/mo | Optional |
Google Tag Manager www.googletagmanager.com | Tag Manager | 68ms | 169 KB | 41% | €1/mo | Optional |
analytics.tiktok.com analytics.tiktok.com | Other | 62ms | 110 KB | 50% | €1/mo | Optional |
Google Tag Manager www.googletagmanager.com | Tag Manager | 56ms | 156 KB | 42% | €1/mo | Optional |
www.uoregon.edu www.uoregon.edu | Other | 51ms | 6 KB | — | €1/mo | Optional |
These scripts may cost more than they're worth
- www.uoregon.edu adds 584ms and costs ~€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
www.uoregon.edu takes 584ms 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
50% 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