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.
5.04 s
Largest Contentful Paint Largest Contentful Paint — how long until the largest visible element loads. Under 2.5s is good.
10.26 s
Total Blocking Time Total Blocking Time — total time the main thread was blocked, preventing user input. Under 200ms is good.
693 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.
11.11 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.
26.94 s
Page Load Progression
692 ms 1.4 s
2.1 s
2.8 s
3.5 s
4.2 s
4.8 s
5.5 sFPage Weight BudgetAction19.3 MB transferred, 151 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
FJS Execution CostAction5669ms total JS executionFIX
Main Thread Breakdown
| Script | Total | Scripting | Parse/Compile | Party |
|---|---|---|---|---|
| https://home.dartmouth.edu/sites/home/files/js/js_orPJ7eQR1DqYGkonn0F0w1KPVPTS4YxcPn3VjuOVP28.js?scope=footer&delta=0&language=en&theme=darthome_2021&include=eJx1ikEOwjAMBD9UCPQzHCM3Na4hsZHjVjyfqAgJInFZ7c7sDOYRRHSVhAXF49QWWpj_iGEXq_CGViFHUecrJ3BWiSlze4Zvtv8XLRjH03gOkzEtjjNhJyjrBPlQk_HDayc3LqgDqVLGmCqGd23tAo5WwO4f60CBWvT7CDd4_sLyAhcWYXI | 1781ms | 495ms | 38ms | 3rd |
| https://home.dartmouth.edu/ | 763ms | 4ms | 1ms | 3rd |
| https://js.hs-analytics.net/analytics/1776803700000/8382967.js | 714ms | 555ms | 14ms | 3rd |
| Unattributable | 635ms | 30ms | 0ms | 3rd |
| https://www.googletagmanager.com/gtag/js?id=G-FDKJ4M25RS&cx=c>m=4e64h1 | 303ms | 257ms | 45ms | 3rd |
| https://www.googletagmanager.com/gtm.js?id=GTM-MRK4RQQ | 279ms | 226ms | 47ms | 3rd |
| https://www.googletagmanager.com/gtag/js?id=G-NMTFNS313S&cx=c>m=4e64k0h2 | 246ms | 208ms | 37ms | 3rd |
| https://www.googletagmanager.com/gtm.js?id=GTM-WHRVJHV | 179ms | 138ms | 40ms | 3rd |
| https://www.googletagmanager.com/gtm.js?id=GTM-PDSXF64 | 172ms | 143ms | 27ms | 3rd |
| https://connect.facebook.net/en_US/fbevents.js | 131ms | 99ms | 30ms | 3rd |
Showing top 10 of 16 scripts
DJS BundlesAction31 scripts, 414 KB unusedFIX
Downloaded but never executed on this page.
| Script | Size | Unused | Minified | Party |
|---|---|---|---|---|
| https://www.googletagmanager.com/gtm.js?id=GTM-WHRVJHV | 139 KB | 67 KB (49%) | ✓ | 3rd |
| https://www.googletagmanager.com/gtag/js?id=G-NMTFNS313S&cx=c>m=4e64k0h2 | 156 KB | 67 KB (43%) | ✓ | 3rd |
| https://home.dartmouth.edu/sites/home/files/js/js_orPJ7eQR1DqYGkonn0F0w1KPVPTS4YxcPn3VjuOVP28.js?scope=footer&delta=0&language=en&theme=darthome_2021&include=eJx1ikEOwjAMBD9UCPQzHCM3Na4hsZHjVjyfqAgJInFZ7c7sDOYRRHSVhAXF49QWWpj_iGEXq_CGViFHUecrJ3BWiSlze4Zvtv8XLRjH03gOkzEtjjNhJyjrBPlQk_HDayc3LqgDqVLGmCqGd23tAo5WwO4f60CBWvT7CDd4_sLyAhcWYXI | 113 KB | 63 KB (56%) | ✓ | 3rd |
| https://www.googletagmanager.com/gtm.js?id=GTM-PDSXF64 | 117 KB | 63 KB (54%) | ✓ | 3rd |
| https://www.googletagmanager.com/gtag/js?id=G-FDKJ4M25RS&cx=c>m=4e64h1 | 152 KB | 63 KB (41%) | ✓ | 3rd |
| https://www.googletagmanager.com/gtm.js?id=GTM-MRK4RQQ | 142 KB | 60 KB (42%) | ✓ | 3rd |
| https://connect.facebook.net/en_US/fbevents.js | 97 KB | 31 KB (32%) | ✓ | 3rd |
| https://siteimproveanalytics.com/js/siteanalyze_66356409.js | 18 KB | — | ✓ | 3rd |
| https://js.hsadspixel.net/pixels.js | 4 KB | — | ✓ | 3rd |
| https://player.vimeo.com/api/player.js | 9 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 InventoryAction151 resources · 19.3 MB · 414 KB savings availableFIX
~414.0 KiB of savings available
| # | Resource | Type | Size | Cache | Unused | 3rd party | Issues |
|---|---|---|---|---|---|---|---|
| — | — | ||||||
| 151 resources | 19.3 MiB | ||||||
BImage Optimization71 images, 0 KB saveableREVIEW
CGreen HostingActionWhether the site is served from green-energy infrastructureREVIEW
Green Hosting
No green hosting detected
BHTTP Cachingno-cacheREVIEW
no-cache
| Directive | Value | Meaning |
|---|---|---|
| no-cache | — | Cache but always revalidate first |
A+Text CompressionAll text resources are compressedPASS
A+Font Loading8 fonts (345 KB)PASS
Web fonts
8
345 KB total
Render-blocking
0
of 8
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 Hints8 hints, 0 missing preconnectsPASS
Current Resource Hints
8 resource hints configured
A+Render-Blocking ResourcesNo render-blocking resources detectedPASS
A+Third-Party ResourcesNo third-party resources detectedPASS
Network Waterfall151 requests over 4140msINFO
Third-Party Script CostPer-script blocking time, transfer cost, and cache headersINFO
| Script | Category | Execution | Transfer | Unused | Monthly Cost | Verdict |
|---|---|---|---|---|---|---|
home.dartmouth.edu home.dartmouth.edu | Other | 1781ms | 113 KB | 56% | $24/mo | Costly |
home.dartmouth.edu home.dartmouth.edu | Other | 763ms | 41 KB | — | $10/mo | Costly |
HubSpot Analytics js.hs-analytics.net | Analytics | 714ms | 46 KB | — | $9/mo | Costly |
Unattributable Unattributable | Other | 635ms | 0 KB | — | $8/mo | Costly |
Google Tag Manager www.googletagmanager.com | Tag Manager | 303ms | 152 KB | 41% | $4/mo | Costly |
Google Tag Manager www.googletagmanager.com | Tag Manager | 279ms | 142 KB | 42% | $4/mo | Costly |
Google Tag Manager www.googletagmanager.com | Tag Manager | 246ms | 156 KB | 43% | $3/mo | Costly |
Google Tag Manager www.googletagmanager.com | Tag Manager | 179ms | 139 KB | 49% | $2/mo | Optional |
Google Tag Manager www.googletagmanager.com | Tag Manager | 172ms | 117 KB | 54% | $2/mo | Optional |
Facebook Pixel connect.facebook.net | Advertising | 131ms | 97 KB | 32% | $2/mo | Optional |
Facebook Pixel connect.facebook.net | Advertising | 115ms | 45 KB | — | $2/mo | Optional |
Facebook Pixel connect.facebook.net | Advertising | 91ms | 19 KB | — | $1/mo | Optional |
js.hubspot.com js.hubspot.com | Other | 78ms | 28 KB | — | $1/mo | Optional |
js.usemessages.com js.usemessages.com | Other | 69ms | 33 KB | — | $1/mo | Optional |
cdn.bc0a.com cdn.bc0a.com | Other | 63ms | 24 KB | — | $1/mo | Optional |
LinkedIn Insight snap.licdn.com | Advertising | 51ms | 19 KB | — | $1/mo | Optional |
These scripts may cost more than they're worth
- home.dartmouth.edu adds 1781ms and costs ~$24/month
- home.dartmouth.edu adds 763ms and costs ~$10/month
- HubSpot Analytics adds 714ms and costs ~$9/month
- Unattributable adds 635ms and costs ~$8/month
- Google Tag Manager adds 303ms and costs ~$4/month
- Google Tag Manager adds 279ms and costs ~$4/month
- Google Tag Manager adds 246ms and costs ~$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
home.dartmouth.edu takes 1781ms 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
56% of home.dartmouth.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
home.dartmouth.edu takes 763ms 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
HubSpot Analytics takes 714ms 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 635ms 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 303ms 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 279ms 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 246ms 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
54% 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