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https://rochester.edu

Performance

· 17 checks — Lighthouse + waterfall + sustainability rolled into one auditable list.
SCORE
74
GRADE
C
FIX
5
REVIEW
3
PASS
7
INFO
2

Performance-focused optimization plan with CWV assessment, top offenders, and time estimates

Mobile Desktop
39
Performance Overall performance score (0–100) based on Core Web Vitals and other metrics. 90+ is good.
100
Accessibility Measures how accessible the page is for users with disabilities. Checks color contrast, ARIA labels, and semantic HTML.
81
Best Practices Checks for modern web development best practices including HTTPS, no console errors, and secure JavaScript.
100
SEO Measures basic SEO optimizations: meta tags, crawlability, link text, and mobile friendliness.

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.

19.66 s

Total Blocking Time Total Blocking Time — total time the main thread was blocked, preventing user input. Under 200ms is good.

714 ms

Cumulative Layout Shift Cumulative Layout Shift — measures visual stability. How much the page layout shifts during loading. Under 0.1 is good.

0.080

Speed Index Speed Index — how quickly content is visually displayed during load. Under 3.4s is good.

7.88 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.

19.91 s

Page Load Progression

633 ms
1.3 s
1.9 s
2.5 s
3.2 s
3.8 s
4.4 s
5.1 s
Checks
17
7 PASS 3 REVIEW 5 FIX
F
Page Weight Budget
Action
5.0 MB transferred, 73 requests
FIX
5.0 MB transferred, 73 requests
Critical::
Page weighs 6.9 MB (5.0 MB transferred)
Warning::
Images are 1.7 MB — compress or use modern formats
Convert images to WebP/AVIF and resize to display dimensions to reduce transfer size.
Got: 1.7 MB
Warning::
JavaScript is 715 KB — consider code splitting or lazy loading
Large JavaScript bundles delay interactivity. Split code by route or defer non-critical scripts.
Got: 715 KB
Info::
Fonts are 286 KB — consider subsetting or using system fonts
Subset fonts to include only used characters, or switch to system font stacks.
Got: 286 KB
Info::
73 HTTP requests
Info::
Estimated 1.0 g CO2 per page load
5.0 MB / 2.4 MB budget
5.0 MB transferred
73 requests
1.0 g CO2 per page load
Other 2.2 MiB 45%
Images 1.7 MiB 34%
JavaScript 715.1 KiB 14%
Fonts 285.6 KiB 6%
Other 48.8 KiB 1%
CSS 26.5 KiB 1%
Other 17.3 KiB 0%
HTML 12.4 KiB 0%
Other 1.1 KiB 0%
Other 559 B 0%
0 2.4 MB 4.9 MB
Over budget

Convert images to WebP/AVIF and resize to display dimensions to reduce transfer size.

Why this matters

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.

Why this matters

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.

Why this matters

Font payload is large — subset to used glyphs only, or fall back to system fonts (zero load time).

Source: web.dev font loading

D
Third-Party Impact
Action
100% third-party, 0 ms blocking
FIX
100% third-party, 0 ms blocking
Warning::
Third-party code accounts for 100% of page weight (5.0 MiB of 5.0 MiB)
Info::
Third-party blocking time is low (0 ms)
100%
First-party Third-party
D
JS Execution Cost
Action
3459ms total JS execution
FIX
3459ms total JS execution
Warning::
Unattributable: 811ms CPU time
Warning::
https://www.rochester.edu/: 767ms CPU time
Warning::
https://www.googletagmanager.com/gtag/js?id=G-NLJH...: 445ms CPU time
Warning::
https://www.googletagmanager.com/gtm.js?id=GTM-TT7...: 421ms CPU time
Warning::
https://www.googletagmanager.com/gtag/js?id=AW-167...: 360ms CPU time
Warning::
Third-party scripts: 3459ms (100% of total)

Main Thread Breakdown

Script Evaluation 45% Other 25% Style & Layout 16% Script Parsing & Compilation 9% Rendering 4%
ScriptTotalScriptingParse/CompileParty
Unattributable811ms85ms0ms3rd
https://www.rochester.edu/767ms29ms5ms3rd
https://www.googletagmanager.com/gtag/js?id=G-NLJHQXH6R7&cx=c&gtm=4e64h1445ms367ms73ms3rd
https://www.googletagmanager.com/gtm.js?id=GTM-TT7PP8Z421ms342ms66ms3rd
https://www.googletagmanager.com/gtag/js?id=AW-16785116022&cx=c&gtm=4e64h1360ms289ms69ms3rd
https://connect.facebook.net/en_US/fbevents.js184ms133ms48ms3rd
https://www.rochester.edu/templatefiles/2025/js/main.min.js183ms53ms12ms3rd
https://connect.facebook.net/signals/config/3883923348587710?v=2.9.303&r=stable&domain=www.rochester.edu&hme=97937018cefade17726f0472876fc101316b2ce9008a35a6a5a7977d7436151a&ex_m=104%2C205%2C154%2C22%2C72%2C73%2C145%2C68%2C67%2C11%2C162%2C90%2C16%2C138%2C127%2C39%2C75%2C78%2C134%2C159%2C164%2C8%2C4%2C5%2C7%2C6%2C3%2C91%2C101%2C165%2C170%2C219%2C62%2C186%2C187%2C55%2C276%2C30%2C74%2C231%2C230%2C229%2C23%2C33%2C103%2C61%2C10%2C63%2C97%2C98%2C99%2C105%2C130%2C31%2C29%2C132%2C133%2C129%2C128%2C155%2C76%2C158%2C156%2C157%2C50%2C60%2C123%2C15%2C161%2C45%2C263%2C264%2C262%2C26%2C27%2C28%2C48%2C146%2C77%2C112%2C18%2C20%2C44%2C40%2C42%2C41%2C83%2C92%2C96%2C110%2C144%2C147%2C46%2C111%2C24%2C21%2C119%2C69%2C36%2C149%2C148%2C150%2C141%2C139%2C25%2C35%2C59%2C109%2C160%2C70%2C17%2C152%2C114%2C81%2C66%2C19%2C85%2C86%2C116%2C84%2C136%2C135%2C34%2C278%2C293%2C212%2C201%2C202%2C200%2C296%2C288%2C52%2C213%2C107%2C131%2C80%2C121%2C54%2C47%2C49%2C113%2C120%2C126%2C58%2C64%2C151%2C115%2C37%2C32%2C53%2C56%2C100%2C163%2C1%2C124%2C14%2C122%2C12%2C2%2C57%2C93%2C65%2C118%2C89%2C88%2C166%2C167%2C94%2C95%2C9%2C125%2C102%2C51%2C142%2C87%2C79%2C71%2C117%2C106%2C43%2C143%2C0%2C82%2C137%2C140%2C153%2C38%2C108%2C13%2C168172ms143ms27ms3rd
https://sc-static.net/scevent.min.js118ms101ms9ms3rd
D
Page Weight Inventory
Action
73 resources · 5.0 MB · 252 KB savings available
FIX
73 resources · 5.0 MB · 252 KB savings available
Warning::
Page weight 4.0 MB over 1MB target
Got: 5.0 MB Expected: ≤ 1 MB
Info::
~252 KB of savings available
Warning::
72 third-party resources (100% of weight)
Info::
3 resources over 200KB
73 resources · 5.0 MiB · 72 third-party 4.0 MiB over 1MB target
Media 45% · 2.2 MiB
Image 34% · 1.7 MiB
JavaScript 14% · 715.1 KiB
Font 6% · 285.6 KiB
CSS 1% · 74.2 KiB
Document 0% · 13.1 KiB
Other 0% · 4.1 KiB

~252.1 KiB of savings available

Remove unused JavaScript: 252.1 KiB
F
HTTP Caching
Action
No cache headers
FIX
No cache headers
Warning::
No Cache-Control header found
Browsers will use heuristic caching, which can be unpredictable. Set explicit cache headers.

No Cache-Control header

Adding a Cache-Control header can significantly improve repeat-visit performance.

B
Image Optimization
25 images, 0 KB saveable
REVIEW
25 images, 0 KB saveable
Info::
All images are well-optimized
25 images 1.7 MB
0 oversized -0 KB
25 legacy format
0 missing dimensions CLS risk
C
JS Bundles
Action
13 scripts, 252 KB unused
REVIEW
13 scripts, 252 KB unused
Warning::
https://www.googletagmanager.com/gtm.js?id=GTM-TT7...: 74 KB unused (48%)
Consider code splitting or tree shaking to reduce unused code.
Warning::
https://www.googletagmanager.com/gtag/js?id=G-NLJH...: 70 KB unused (40%)
Consider code splitting or tree shaking to reduce unused code.
Warning::
https://www.googletagmanager.com/gtag/js?id=AW-167...: 54 KB unused (39%)
Consider code splitting or tree shaking to reduce unused code.
Warning::
https://connect.facebook.net/en_US/fbevents.js: 33 KB unused (34%)
Consider code splitting or tree shaking to reduce unused code.
Warning::
https://www.rochester.edu/templatefiles/2025/js/ma...: 21 KB unused (72%)
Consider code splitting or tree shaking to reduce unused code.
Info::
Total unused JavaScript: 252 KB
252 KB unused JavaScript

Downloaded but never executed on this page.

ScriptSizeUnusedMinifiedParty
https://www.googletagmanager.com/gtm.js?id=GTM-TT7PP8Z154 KB74 KB (48%)✓3rd
https://www.googletagmanager.com/gtag/js?id=G-NLJHQXH6R7&cx=c&gtm=4e64h1176 KB70 KB (40%)✓3rd
https://www.googletagmanager.com/gtag/js?id=AW-16785116022&cx=c&gtm=4e64h1138 KB54 KB (39%)✓3rd
https://connect.facebook.net/en_US/fbevents.js97 KB33 KB (34%)✓3rd
https://www.rochester.edu/templatefiles/2025/js/main.min.js30 KB21 KB (72%)✓3rd
https://bat.bing.com/bat.js15 KB—✓3rd
https://kit.fontawesome.com/09cf01df45.js6 KB—✓3rd
https://sc-static.net/scevent.min.js25 KB—✓3rd
https://googleads.g.doubleclick.net/pagead/viewthroughconversion/16785116022/?random=1776801961492&cv=11&fst=1776801961492&bg=ffffff&guid=ON&async=1&en=gtag.config&gtm=45be64h1v9201859962z8813410015za20gzb813410015zd813410015xec&gcd=13l3l3l3l1l1&dma=0&tag_exp=0~115938466~115938469~117266401~117384405~118128923~118463262&u_w=412&u_h=823&url=https%3A%2F%2Fwww.rochester.edu%2F&rcb=3&frm=0&tiba=University%20of%20Rochester%20%7C%20Where%20Wonder%20Fuels%20Discovery&hn=www.googleadservices.com&npa=0&pscdl=noapi&auid=1017035945.1776801961&uaa=&uab=64&uafvl=Not-A.Brand%3B24.0.0.0%7CChromium%3B146.0.7680.164&uamb=1&uam=moto%20g%20power%20(2022)&uap=Android&uapv=11.0&uaw=0&data=event%3Dgtag.config&rfmt=3&fmt=42 KB—✓3rd
https://connect.facebook.net/signals/config/3883923348587710?v=2.9.303&r=stable&domain=www.rochester.edu&hme=97937018cefade17726f0472876fc101316b2ce9008a35a6a5a7977d7436151a&ex_m=104%2C205%2C154%2C22%2C72%2C73%2C145%2C68%2C67%2C11%2C162%2C90%2C16%2C138%2C127%2C39%2C75%2C78%2C134%2C159%2C164%2C8%2C4%2C5%2C7%2C6%2C3%2C91%2C101%2C165%2C170%2C219%2C62%2C186%2C187%2C55%2C276%2C30%2C74%2C231%2C230%2C229%2C23%2C33%2C103%2C61%2C10%2C63%2C97%2C98%2C99%2C105%2C130%2C31%2C29%2C132%2C133%2C129%2C128%2C155%2C76%2C158%2C156%2C157%2C50%2C60%2C123%2C15%2C161%2C45%2C263%2C264%2C262%2C26%2C27%2C28%2C48%2C146%2C77%2C112%2C18%2C20%2C44%2C40%2C42%2C41%2C83%2C92%2C96%2C110%2C144%2C147%2C46%2C111%2C24%2C21%2C119%2C69%2C36%2C149%2C148%2C150%2C141%2C139%2C25%2C35%2C59%2C109%2C160%2C70%2C17%2C152%2C114%2C81%2C66%2C19%2C85%2C86%2C116%2C84%2C136%2C135%2C34%2C278%2C293%2C212%2C201%2C202%2C200%2C296%2C288%2C52%2C213%2C107%2C131%2C80%2C121%2C54%2C47%2C49%2C113%2C120%2C126%2C58%2C64%2C151%2C115%2C37%2C32%2C53%2C56%2C100%2C163%2C1%2C124%2C14%2C122%2C12%2C2%2C57%2C93%2C65%2C118%2C89%2C88%2C166%2C167%2C94%2C95%2C9%2C125%2C102%2C51%2C142%2C87%2C79%2C71%2C117%2C106%2C43%2C143%2C0%2C82%2C137%2C140%2C153%2C38%2C108%2C13%2C16846 KB—✓3rd

Consider code splitting or tree shaking to reduce unused code.

Why this matters

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.

Why this matters

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.

Why this matters

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.

Why this matters

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.

Why this matters

This bundle has high unused code — code-split or tree-shake to ship only what executes.

Source: web.dev / Lighthouse coverage

C
Green Hosting
Action
Whether the site is served from green-energy infrastructure
REVIEW

Green Hosting

No green hosting detected

A+
Text Compression
All text resources are compressed
PASS
All text resources are compressed
Info::
All text resources are compressed
All text resources are properly compressed.
A+
Font Loading
12 fonts (286 KB)
PASS
12 fonts (286 KB)
Info::
12 font(s) use font-display: swap (FOUT risk but functional)

Web fonts

12

286 KB total

Render-blocking

0

of 12

Dominant font-display

swap

Most common across fonts

Font loading timeline
Transfer FOIT (block) FOUT (swap)
0 ms 2.0 s 4.0 s 6.0 s 8.0 s 10.0 s 12.0 s 14.0 s 16.0 s 18.0 s 20.0 s FCP 5.0 s LCP 19.7 shttps://use.typekit.net/af/250efc/00000000000000007750957d/31/l?primer=7cdcb44be4a7db8877ffa5c0007b8dd865b3bbc383831fe2ea177f62257a9191&fvd=n4&v=3l https://use.typekit.net/af/250efc/00000000000000007750957d/31/l?primer=7cdcb44be4a7db8877ffa5c0007b8dd865b3bbc383831fe2ea177f62257a9191&fvd=n4&v=3 — 87.2 KiB — 21 ms — font-display: swaphttps://ka-p.fontawesome.com/releases/v7.1.0/webfonts/pro-fa-solid-900-14.woff2pro-fa-solid-900-14.woff2 https://ka-p.fontawesome.com/releases/v7.1.0/webfonts/pro-fa-solid-900-14.woff2 — 14.1 KiB — 37 ms — font-display: swaphttps://ka-p.fontawesome.com/releases/v7.1.0/webfonts/pro-fa-solid-900-1.woff2pro-fa-solid-900-1.woff2 https://ka-p.fontawesome.com/releases/v7.1.0/webfonts/pro-fa-solid-900-1.woff2 — 10.5 KiB — 57 ms — font-display: swaphttps://ka-p.fontawesome.com/releases/v7.1.0/webfonts/pro-fa-solid-900-0.woff2pro-fa-solid-900-0.woff2 https://ka-p.fontawesome.com/releases/v7.1.0/webfonts/pro-fa-solid-900-0.woff2 — 9.1 KiB — 42 ms — font-display: swaphttps://use.typekit.net/af/d6a66d/00000000000000007735e5b9/31/l?subset_id=2&fvd=n7&v=3l https://use.typekit.net/af/d6a66d/00000000000000007735e5b9/31/l?subset_id=2&fvd=n7&v=3 — 28.8 KiB — 20 ms — font-display: swaphttps://ka-p.fontawesome.com/releases/v7.1.0/webfonts/pro-fa-regular-400-1.woff2pro-fa-regular-400-1.woff2 https://ka-p.fontawesome.com/releases/v7.1.0/webfonts/pro-fa-regular-400-1.woff2 — 13.1 KiB — 35 ms — font-display: swaphttps://ka-p.fontawesome.com/releases/v7.1.0/webfonts/pro-fa-brands-400-1.woff2pro-fa-brands-400-1.woff2 https://ka-p.fontawesome.com/releases/v7.1.0/webfonts/pro-fa-brands-400-1.woff2 — 31.0 KiB — 43 ms — font-display: swaphttps://ka-p.fontawesome.com/releases/v7.1.0/webfonts/pro-fa-brands-400-0.woff2pro-fa-brands-400-0.woff2 https://ka-p.fontawesome.com/releases/v7.1.0/webfonts/pro-fa-brands-400-0.woff2 — 35.1 KiB — 38 ms — font-display: swaphttps://ka-p.fontawesome.com/releases/v7.1.0/webfonts/pro-fa-regular-400-14.woff2pro-fa-regular-400-14.w... https://ka-p.fontawesome.com/releases/v7.1.0/webfonts/pro-fa-regular-400-14.woff2 — 17.5 KiB — 39 ms — font-display: swaphttps://ka-p.fontawesome.com/releases/v7.1.0/webfonts/pro-fa-solid-900-17.woff2pro-fa-solid-900-17.woff2 https://ka-p.fontawesome.com/releases/v7.1.0/webfonts/pro-fa-solid-900-17.woff2 — 9.5 KiB — 29 ms — font-display: swaphttps://ka-p.fontawesome.com/releases/v7.1.0/webfonts/pro-fa-solid-900-20.woff2pro-fa-solid-900-20.woff2 https://ka-p.fontawesome.com/releases/v7.1.0/webfonts/pro-fa-solid-900-20.woff2 — 14.1 KiB — 43 ms — font-display: swaphttps://ka-p.fontawesome.com/releases/v7.1.0/webfonts/pro-fa-solid-900-2.woff2pro-fa-solid-900-2.woff2 https://ka-p.fontawesome.com/releases/v7.1.0/webfonts/pro-fa-solid-900-2.woff2 — 15.8 KiB — 47 ms — font-display: swap
l woff2 swap
Size 87 KB
Load time 21 ms
Start 3.0 s
Risk FOUT — text flashes from fallback to web font
pro-fa-solid-900-14.woff2 woff2 swap
Size 14 KB
Load time 37 ms
Start 3.0 s
Risk FOUT — text flashes from fallback to web font
pro-fa-solid-900-1.woff2 woff2 swap
Size 10 KB
Load time 57 ms
Start 3.0 s
Risk FOUT — text flashes from fallback to web font
pro-fa-solid-900-0.woff2 woff2 swap
Size 9 KB
Load time 42 ms
Start 3.0 s
Risk FOUT — text flashes from fallback to web font
l woff2 swap
Size 29 KB
Load time 20 ms
Start 3.0 s
Risk FOUT — text flashes from fallback to web font
pro-fa-regular-400-1.woff2 woff2 swap
Size 13 KB
Load time 35 ms
Start 3.0 s
Risk FOUT — text flashes from fallback to web font
pro-fa-brands-400-1.woff2 woff2 swap
Size 31 KB
Load time 43 ms
Start 3.0 s
Risk FOUT — text flashes from fallback to web font
pro-fa-brands-400-0.woff2 woff2 swap
Size 35 KB
Load time 38 ms
Start 3.0 s
Risk FOUT — text flashes from fallback to web font
pro-fa-regular-400-14.w... woff2 swap
Size 17 KB
Load time 39 ms
Start 3.0 s
Risk FOUT — text flashes from fallback to web font
pro-fa-solid-900-17.woff2 woff2 swap
Size 9 KB
Load time 29 ms
Start 3.0 s
Risk FOUT — text flashes from fallback to web font
pro-fa-solid-900-20.woff2 woff2 swap
Size 14 KB
Load time 43 ms
Start 3.0 s
Risk FOUT — text flashes from fallback to web font
pro-fa-solid-900-2.woff2 woff2 swap
Size 16 KB
Load time 47 ms
Start 3.0 s
Risk FOUT — text flashes from fallback to web font
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 Caching
All resources properly cached
PASS
All resources properly cached
Info::
No caching issues found
All static resources have appropriate caching headers.
A+
Critical Rendering Path
No render-blocking resources
PASS
No render-blocking resources
Info::
No render-blocking resources detected
A+
Resource Hints
5 hints, 0 missing preconnects
PASS
5 hints, 0 missing preconnects
Info::
Page uses 5 resource hint(s)

Current Resource Hints

preconnect
3
preload
2
dns-prefetch
—
prefetch
—

5 resource hints configured

A+
Render-Blocking Resources
No render-blocking resources detected
PASS
No render-blocking resources detected
Info::
No render-blocking resources detected in <head>
A+
Third-Party Resources
No third-party resources detected
PASS
No third-party resources detected
Network Waterfall
73 requests over 7689ms
INFO
0 ms 2.0 s 4.0 s 6.0 s 8.0 s 10.0 s 12.0 s 14.0 s 16.0 s 18.0 s 20.0 s FCP 5.0 s LCP 19.7 shttps://rochester.edu// https://rochester.edu/ — 301 — 680 B — 957 ms — http/1.1https://www.rochester.edu/www.rochester.edu/ https://www.rochester.edu/ — 200 — 11.4 KiB — 986 ms — http/1.1https://use.typekit.net/trg3udu.cssuse.typekit.net/trg3udu.css https://use.typekit.net/trg3udu.css — 200 — 1.4 KiB — 290 ms — h2https://kit.fontawesome.com/09cf01df45.jskit.fontawesome.com/09cf01df45.js https://kit.fontawesome.com/09cf01df45.js — 200 — 5.7 KiB — 274 ms — h2https://www.rochester.edu/templatefiles/2025/css/main.min.css?v=1775851357498www.rochester.edu/templatefiles/202... https://www.rochester.edu/templatefiles/2025/css/main.min.css?v=1775851357498 — 200 — 25.0 KiB — 486 ms — http/1.1https://www.rochester.edu/templatefiles/2025/js/main.min.jswww.rochester.edu/templatefiles/202... https://www.rochester.edu/templatefiles/2025/js/main.min.js — 200 — 30.4 KiB — 965 ms — 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h3https://www.google.com/ccm/collect?rcb=3&frm=0&en=page_view&dl=https%3A%2F%2Fwww.rochester.edu%2F&scrsrc=www.googletagmanager.com&rnd=1799037959.1776801961&dt=University%20of%20Rochester%20%7C%20Where%20Wonder%20Fuels%20Discovery&auid=1017035945.1776801961&navt=n&npa=0&gtm=45be64h1v9201859962z8813410015za20gzb813410015zd813410015xec&gcd=13l3l3l3l1l1&dma=0&tag_exp=0~115938466~115938469~117266401~117384405~118128923~118463262&apve=1&apvf=f&apvc=1&tids=AW-16785116022&tid=AW-16785116022&tft=1776801961528&tfd=3344www.google.com/ccm/collect?rcb=3&fr... https://www.google.com/ccm/collect?rcb=3&frm=0&en=page_view&dl=https%3A%2F%2Fwww.rochester.edu%2F&scrsrc=www.googletagmanager.com&rnd=1799037959.1776801961&dt=University%20of%20Rochester%20%7C%20Where%20Wonder%20Fuels%20Discovery&auid=1017035945.1776801961&navt=n&npa=0&gtm=45be64h1v9201859962z8813410015za20gzb813410015zd813410015xec&gcd=13l3l3l3l1l1&dma=0&tag_exp=0~115938466~115938469~117266401~117384405~118128923~118463262&apve=1&apvf=f&apvc=1&tids=AW-16785116022&tid=AW-16785116022&tft=1776801961528&tfd=3344 — 200 — 21 B — 51 ms — h3https://connect.facebook.net/signals/config/3883923348587710?v=2.9.303&r=stable&domain=www.rochester.edu&hme=97937018cefade17726f0472876fc101316b2ce9008a35a6a5a7977d7436151a&ex_m=104%2C205%2C154%2C22%2C72%2C73%2C145%2C68%2C67%2C11%2C162%2C90%2C16%2C138%2C127%2C39%2C75%2C78%2C134%2C159%2C164%2C8%2C4%2C5%2C7%2C6%2C3%2C91%2C101%2C165%2C170%2C219%2C62%2C186%2C187%2C55%2C276%2C30%2C74%2C231%2C230%2C229%2C23%2C33%2C103%2C61%2C10%2C63%2C97%2C98%2C99%2C105%2C130%2C31%2C29%2C132%2C133%2C129%2C128%2C155%2C76%2C158%2C156%2C157%2C50%2C60%2C123%2C15%2C161%2C45%2C263%2C264%2C262%2C26%2C27%2C28%2C48%2C146%2C77%2C112%2C18%2C20%2C44%2C40%2C42%2C41%2C83%2C92%2C96%2C110%2C144%2C147%2C46%2C111%2C24%2C21%2C119%2C69%2C36%2C149%2C148%2C150%2C141%2C139%2C25%2C35%2C59%2C109%2C160%2C70%2C17%2C152%2C114%2C81%2C66%2C19%2C85%2C86%2C116%2C84%2C136%2C135%2C34%2C278%2C293%2C212%2C201%2C202%2C200%2C296%2C288%2C52%2C213%2C107%2C131%2C80%2C121%2C54%2C47%2C49%2C113%2C120%2C126%2C58%2C64%2C151%2C115%2C37%2C32%2C53%2C56%2C100%2C163%2C1%2C124%2C14%2C122%2C12%2C2%2C57%2C93%2C65%2C118%2C89%2C88%2C166%2C167%2C94%2C95%2C9%2C125%2C102%2C51%2C142%2C87%2C79%2C71%2C117%2C106%2C43%2C143%2C0%2C82%2C137%2C140%2C153%2C38%2C108%2C13%2C168connect.facebook.net/signals/config... https://connect.facebook.net/signals/config/3883923348587710?v=2.9.303&r=stable&domain=www.rochester.edu&hme=97937018cefade17726f0472876fc101316b2ce9008a35a6a5a7977d7436151a&ex_m=104%2C205%2C154%2C22%2C72%2C73%2C145%2C68%2C67%2C11%2C162%2C90%2C16%2C138%2C127%2C39%2C75%2C78%2C134%2C159%2C164%2C8%2C4%2C5%2C7%2C6%2C3%2C91%2C101%2C165%2C170%2C219%2C62%2C186%2C187%2C55%2C276%2C30%2C74%2C231%2C230%2C229%2C23%2C33%2C103%2C61%2C10%2C63%2C97%2C98%2C99%2C105%2C130%2C31%2C29%2C132%2C133%2C129%2C128%2C155%2C76%2C158%2C156%2C157%2C50%2C60%2C123%2C15%2C161%2C45%2C263%2C264%2C262%2C26%2C27%2C28%2C48%2C146%2C77%2C112%2C18%2C20%2C44%2C40%2C42%2C41%2C83%2C92%2C96%2C110%2C144%2C147%2C46%2C111%2C24%2C21%2C119%2C69%2C36%2C149%2C148%2C150%2C141%2C139%2C25%2C35%2C59%2C109%2C160%2C70%2C17%2C152%2C114%2C81%2C66%2C19%2C85%2C86%2C116%2C84%2C136%2C135%2C34%2C278%2C293%2C212%2C201%2C202%2C200%2C296%2C288%2C52%2C213%2C107%2C131%2C80%2C121%2C54%2C47%2C49%2C113%2C120%2C126%2C58%2C64%2C151%2C115%2C37%2C32%2C53%2C56%2C100%2C163%2C1%2C124%2C14%2C122%2C12%2C2%2C57%2C93%2C65%2C118%2C89%2C88%2C166%2C167%2C94%2C95%2C9%2C125%2C102%2C51%2C142%2C87%2C79%2C71%2C117%2C106%2C43%2C143%2C0%2C82%2C137%2C140%2C153%2C38%2C108%2C13%2C168 — 200 — 46.5 KiB — 264 ms — h3https://www.google-analytics.com/g/collect?v=2&tid=G-HV00NPNX1N&gtm=45je64h1v9167085612z8813410015za20gzb813410015zd813410015&_p=1776801961126&gcd=13l3l3l3l1l1&npa=0&dma=0&are=1&cid=1169957258.1776801962&frm=0&pscdl=noapi&rcb=16&sr=412x823&uaa=&uab=64&uafvl=Not-A.Brand%3B24.0.0.0%7CChromium%3B146.0.7680.164&uam=moto%20g%20power%20(2022)&uamb=1&uap=Android&uapv=11.0&uaw=0&ul=en-us&_s=1&tag_exp=0~115938466~115938468~117266400~118128923&sid=1776801961&sct=1&seg=0&dl=https%3A%2F%2Fwww.rochester.edu%2F&dt=University%20of%20Rochester%20%7C%20Where%20Wonder%20Fuels%20Discovery&en=page_view&_fv=1&_nsi=1&_ss=1&tfd=3487www.google-analytics.com/g/collect?... https://www.google-analytics.com/g/collect?v=2&tid=G-HV00NPNX1N&gtm=45je64h1v9167085612z8813410015za20gzb813410015zd813410015&_p=1776801961126&gcd=13l3l3l3l1l1&npa=0&dma=0&are=1&cid=1169957258.1776801962&frm=0&pscdl=noapi&rcb=16&sr=412x823&uaa=&uab=64&uafvl=Not-A.Brand%3B24.0.0.0%7CChromium%3B146.0.7680.164&uam=moto%20g%20power%20(2022)&uamb=1&uap=Android&uapv=11.0&uaw=0&ul=en-us&_s=1&tag_exp=0~115938466~115938468~117266400~118128923&sid=1776801961&sct=1&seg=0&dl=https%3A%2F%2Fwww.rochester.edu%2F&dt=University%20of%20Rochester%20%7C%20Where%20Wonder%20Fuels%20Discovery&en=page_view&_fv=1&_nsi=1&_ss=1&tfd=3487 — 204 — 550 B — 27 ms — h2https://analytics.google.com/g/collect?v=2&tid=G-NLJHQXH6R7&gtm=45je64h1v9167085612z8813410015za20gzb813410015zd813410015&_p=1776801961126&_gaz=1&gcd=13l3l3l3l1l1&npa=0&dma=0&_eu=AAAAAGA&are=1&cid=1169957258.1776801962&frm=0&pscdl=noapi&rcb=16&sr=412x823&uaa=&uab=64&uafvl=Not-A.Brand%3B24.0.0.0%7CChromium%3B146.0.7680.164&uam=moto%20g%20power%20(2022)&uamb=1&uap=Android&uapv=11.0&uaw=0&ul=en-us&gaf=2&_s=1&tag_exp=0~115938466~115938468~117266400~118128923&sid=1776801961&sct=1&seg=0&dl=https%3A%2F%2Fwww.rochester.edu%2F&dt=University%20of%20Rochester%20%7C%20Where%20Wonder%20Fuels%20Discovery&en=page_view&_fv=1&_ss=1&tfd=3497analytics.google.com/g/collect?v=2&... https://analytics.google.com/g/collect?v=2&tid=G-NLJHQXH6R7&gtm=45je64h1v9167085612z8813410015za20gzb813410015zd813410015&_p=1776801961126&_gaz=1&gcd=13l3l3l3l1l1&npa=0&dma=0&_eu=AAAAAGA&are=1&cid=1169957258.1776801962&frm=0&pscdl=noapi&rcb=16&sr=412x823&uaa=&uab=64&uafvl=Not-A.Brand%3B24.0.0.0%7CChromium%3B146.0.7680.164&uam=moto%20g%20power%20(2022)&uamb=1&uap=Android&uapv=11.0&uaw=0&ul=en-us&gaf=2&_s=1&tag_exp=0~115938466~115938468~117266400~118128923&sid=1776801961&sct=1&seg=0&dl=https%3A%2F%2Fwww.rochester.edu%2F&dt=University%20of%20Rochester%20%7C%20Where%20Wonder%20Fuels%20Discovery&en=page_view&_fv=1&_ss=1&tfd=3497 — 204 — 550 B — 21 ms — h2https://stats.g.doubleclick.net/g/collect?v=2&tid=G-NLJHQXH6R7&cid=1169957258.1776801962&gtm=45je64h1v9167085612z8813410015za20gzb813410015zd813410015&rcb=16&aip=1&dma=0&gcd=13l3l3l3l1l1&npa=0&frm=0&tag_exp=0~115938466~115938468~117266400~118128923stats.g.doubleclick.net/g/collect?v... https://stats.g.doubleclick.net/g/collect?v=2&tid=G-NLJHQXH6R7&cid=1169957258.1776801962&gtm=45je64h1v9167085612z8813410015za20gzb813410015zd813410015&rcb=16&aip=1&dma=0&gcd=13l3l3l3l1l1&npa=0&frm=0&tag_exp=0~115938466~115938468~117266400~118128923 — 204 — 559 B — 25 ms — h2https://www.google.com.sg/ads/ga-audiences?v=1&t=sr&slf_rd=1&_r=4&tid=G-NLJHQXH6R7&cid=1169957258.1776801962&gtm=45je64h1v9167085612z8813410015za20gzb813410015zd813410015&rcb=16&aip=1&dma=0&gcd=13l3l3l3l1l1&npa=0&frm=0&tag_exp=0~115938466~115938468~117266400~118128923&z=175754405www.google.com.sg/ads/ga-audiences?... https://www.google.com.sg/ads/ga-audiences?v=1&t=sr&slf_rd=1&_r=4&tid=G-NLJHQXH6R7&cid=1169957258.1776801962&gtm=45je64h1v9167085612z8813410015za20gzb813410015zd813410015&rcb=16&aip=1&dma=0&gcd=13l3l3l3l1l1&npa=0&frm=0&tag_exp=0~115938466~115938468~117266400~118128923&z=175754405 — 200 — 408 B — 27 ms — h2https://bat.bing.com/p/action/187166059.jsbat.bing.com/p/action/187166059.js https://bat.bing.com/p/action/187166059.js — 200 — 428 B — 62 ms — h2https://www.google.com/pagead/1p-user-list/16785116022/?random=1776801961492&cv=11&fst=1776801600000&bg=ffffff&guid=ON&async=1&en=gtag.config&gtm=45be64h1v9201859962z8813410015za20gzb813410015zd813410015xec&gcd=13l3l3l3l1l1&dma=0&tag_exp=0~115938466~115938469~117266401~117384405~118128923~118463262&u_w=412&u_h=823&url=https%3A%2F%2Fwww.rochester.edu%2F&rcb=3&frm=0&tiba=University%20of%20Rochester%20%7C%20Where%20Wonder%20Fuels%20Discovery&hn=www.googleadservices.com&npa=0&pscdl=noapi&auid=1017035945.1776801961&uaa=&uab=64&uafvl=Not-A.Brand%3B24.0.0.0%7CChromium%3B146.0.7680.164&uamb=1&uam=moto%20g%20power%20(2022)&uap=Android&uapv=11.0&uaw=0&data=event%3Dgtag.config&rfmt=3&fmt=3&is_vtc=1&cid=CAQSyAEABaugfZifud0Hf1wPGv6Utp_YL3JKwNRV3elE2wFUCkK-bhkBBOtGRcsCRzOMkbi2M2L92v5KZ99P_DOYmIhPFIlrmkSXTtaafzr2eII_DaWcwamCSX6iVRny0IkVrnJpER1vhlTUM19gBhFCw6sEJZuPqJWALTVgoxJFVYLC9G37X5wrwNR6Ura2ekOPxjdQoL-Hp3lkgh4iJxomJnP0MdMXuF_wj2_XaEJB2vfkm0_n5DCx9LL5KcNYlkbfwqZbHK5hcg2TPg&random=3259179530&rmt_tld=0&ipr=ywww.google.com/pagead/1p-user-list/... https://www.google.com/pagead/1p-user-list/16785116022/?random=1776801961492&cv=11&fst=1776801600000&bg=ffffff&guid=ON&async=1&en=gtag.config&gtm=45be64h1v9201859962z8813410015za20gzb813410015zd813410015xec&gcd=13l3l3l3l1l1&dma=0&tag_exp=0~115938466~115938469~117266401~117384405~118128923~118463262&u_w=412&u_h=823&url=https%3A%2F%2Fwww.rochester.edu%2F&rcb=3&frm=0&tiba=University%20of%20Rochester%20%7C%20Where%20Wonder%20Fuels%20Discovery&hn=www.googleadservices.com&npa=0&pscdl=noapi&auid=1017035945.1776801961&uaa=&uab=64&uafvl=Not-A.Brand%3B24.0.0.0%7CChromium%3B146.0.7680.164&uamb=1&uam=moto%20g%20power%20(2022)&uap=Android&uapv=11.0&uaw=0&data=event%3Dgtag.config&rfmt=3&fmt=3&is_vtc=1&cid=CAQSyAEABaugfZifud0Hf1wPGv6Utp_YL3JKwNRV3elE2wFUCkK-bhkBBOtGRcsCRzOMkbi2M2L92v5KZ99P_DOYmIhPFIlrmkSXTtaafzr2eII_DaWcwamCSX6iVRny0IkVrnJpER1vhlTUM19gBhFCw6sEJZuPqJWALTVgoxJFVYLC9G37X5wrwNR6Ura2ekOPxjdQoL-Hp3lkgh4iJxomJnP0MdMXuF_wj2_XaEJB2vfkm0_n5DCx9LL5KcNYlkbfwqZbHK5hcg2TPg&random=3259179530&rmt_tld=0&ipr=y — 200 — 64 B — 16 ms — h3https://www.google.com.sg/pagead/1p-user-list/16785116022/?random=1776801961492&cv=11&fst=1776801600000&bg=ffffff&guid=ON&async=1&en=gtag.config&gtm=45be64h1v9201859962z8813410015za20gzb813410015zd813410015xec&gcd=13l3l3l3l1l1&dma=0&tag_exp=0~115938466~115938469~117266401~117384405~118128923~118463262&u_w=412&u_h=823&url=https%3A%2F%2Fwww.rochester.edu%2F&rcb=3&frm=0&tiba=University%20of%20Rochester%20%7C%20Where%20Wonder%20Fuels%20Discovery&hn=www.googleadservices.com&npa=0&pscdl=noapi&auid=1017035945.1776801961&uaa=&uab=64&uafvl=Not-A.Brand%3B24.0.0.0%7CChromium%3B146.0.7680.164&uamb=1&uam=moto%20g%20power%20(2022)&uap=Android&uapv=11.0&uaw=0&data=event%3Dgtag.config&rfmt=3&fmt=3&is_vtc=1&cid=CAQSyAEABaugfZifud0Hf1wPGv6Utp_YL3JKwNRV3elE2wFUCkK-bhkBBOtGRcsCRzOMkbi2M2L92v5KZ99P_DOYmIhPFIlrmkSXTtaafzr2eII_DaWcwamCSX6iVRny0IkVrnJpER1vhlTUM19gBhFCw6sEJZuPqJWALTVgoxJFVYLC9G37X5wrwNR6Ura2ekOPxjdQoL-Hp3lkgh4iJxomJnP0MdMXuF_wj2_XaEJB2vfkm0_n5DCx9LL5KcNYlkbfwqZbHK5hcg2TPg&random=3259179530&rmt_tld=1&ipr=ywww.google.com.sg/pagead/1p-user-li... https://www.google.com.sg/pagead/1p-user-list/16785116022/?random=1776801961492&cv=11&fst=1776801600000&bg=ffffff&guid=ON&async=1&en=gtag.config&gtm=45be64h1v9201859962z8813410015za20gzb813410015zd813410015xec&gcd=13l3l3l3l1l1&dma=0&tag_exp=0~115938466~115938469~117266401~117384405~118128923~118463262&u_w=412&u_h=823&url=https%3A%2F%2Fwww.rochester.edu%2F&rcb=3&frm=0&tiba=University%20of%20Rochester%20%7C%20Where%20Wonder%20Fuels%20Discovery&hn=www.googleadservices.com&npa=0&pscdl=noapi&auid=1017035945.1776801961&uaa=&uab=64&uafvl=Not-A.Brand%3B24.0.0.0%7CChromium%3B146.0.7680.164&uamb=1&uam=moto%20g%20power%20(2022)&uap=Android&uapv=11.0&uaw=0&data=event%3Dgtag.config&rfmt=3&fmt=3&is_vtc=1&cid=CAQSyAEABaugfZifud0Hf1wPGv6Utp_YL3JKwNRV3elE2wFUCkK-bhkBBOtGRcsCRzOMkbi2M2L92v5KZ99P_DOYmIhPFIlrmkSXTtaafzr2eII_DaWcwamCSX6iVRny0IkVrnJpER1vhlTUM19gBhFCw6sEJZuPqJWALTVgoxJFVYLC9G37X5wrwNR6Ura2ekOPxjdQoL-Hp3lkgh4iJxomJnP0MdMXuF_wj2_XaEJB2vfkm0_n5DCx9LL5KcNYlkbfwqZbHK5hcg2TPg&random=3259179530&rmt_tld=1&ipr=y 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HTML JavaScript CSS Images Fonts XHR/Fetch Other
Third-Party Script Cost
Per-script blocking time, transfer cost, and cache headers
INFO
100% of JavaScript execution is third-party
First-party Third-party 3459ms · 677KB · $46/mo
Unattributable
Other
Costly
Execution 811ms
Transfer 0 KB
Monthly Cost $11/mo
www.rochester.edu
Other
Costly
Execution 767ms
Transfer 11 KB
Monthly Cost $10/mo
Google Tag Manager
Tag Manager
Costly
Execution 445ms
Transfer 176 KB
Unused 40%
Monthly Cost $6/mo
Google Tag Manager
Tag Manager
Costly
Execution 421ms
Transfer 154 KB
Unused 48%
Monthly Cost $6/mo
Google Tag Manager
Tag Manager
Costly
Execution 360ms
Transfer 138 KB
Unused 39%
Monthly Cost $5/mo
Facebook Pixel
Advertising
Optional
Execution 184ms
Transfer 97 KB
Unused 34%
Monthly Cost $2/mo
www.rochester.edu
Other
Optional
Execution 183ms
Transfer 30 KB
Unused 72%
Monthly Cost $2/mo
Facebook Pixel
Advertising
Optional
Execution 172ms
Transfer 46 KB
Monthly Cost $2/mo
sc-static.net
Other
Optional
Execution 118ms
Transfer 25 KB
Monthly Cost $2/mo

These scripts may cost more than they're worth

  • Unattributable adds 811ms and costs ~$11/month
  • www.rochester.edu adds 767ms and costs ~$10/month
  • Google Tag Manager adds 445ms and costs ~$6/month
  • Google Tag Manager adds 421ms and costs ~$6/month
  • Google Tag Manager adds 360ms and costs ~$5/month

100% of JavaScript execution time is spent on third-party scripts. Consider auditing which scripts are essential.

Why this matters

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 811ms of CPU time. Consider loading it asynchronously or replacing it with a lighter alternative.

Why this matters

This script has high main-thread execution time — optimize hot paths or defer.

Source: web.dev

www.rochester.edu takes 767ms of CPU time. Consider loading it asynchronously or replacing it with a lighter alternative.

Why this matters

This script has high main-thread execution time — optimize hot paths or defer.

Source: web.dev

Google Tag Manager takes 445ms of CPU time. Consider loading it asynchronously or replacing it with a lighter alternative.

Why this matters

This script has high main-thread execution time — optimize hot paths or defer.

Source: web.dev

Google Tag Manager takes 421ms of CPU time. Consider loading it asynchronously or replacing it with a lighter alternative.

Why this matters

This script has high main-thread execution time — optimize hot paths or defer.

Source: web.dev

Google Tag Manager takes 360ms of CPU time. Consider loading it asynchronously or replacing it with a lighter alternative.

Why this matters

This script has high main-thread execution time — optimize hot paths or defer.

Source: web.dev

72% of www.rochester.edu's code is unused. The script may be loading features you don't use.

Why this matters

Bundle has high unused-code ratio — tree-shaking and route-splitting recover the wasted bytes.

Source: web.dev

How third-party costs are calculated

All checks on this page are automated. Results are estimates - run targeted manual reviews when the score affects a release decision.

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