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https://ou.edu

Performance

· 15 checks — Lighthouse + waterfall + sustainability rolled into one auditable list.
SCORE
69
GRADE
D
FIX
5
REVIEW
3
PASS
5
INFO
2

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

Mobile Desktop
55
Performance Overall performance score (0–100) based on Core Web Vitals and other metrics. 90+ is good.
92
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.
92
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.

2.89 s

Largest Contentful Paint Largest Contentful Paint — how long until the largest visible element loads. Under 2.5s is good.

10.57 s

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

112 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.

5.44 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.

10.62 s

Page Load Progression

1.2 s
2.5 s
3.7 s
4.9 s
6.1 s
7.3 s
8.6 s
9.8 s
Checks
15
5 PASS 3 REVIEW 5 FIX
F
Page Weight Budget
Action
26.4 MB transferred, 110 requests
FIX
26.4 MB transferred, 110 requests
Critical::
Page weighs 35.9 MB (26.4 MB transferred)
Warning::
Images are 11.5 MB — compress or use modern formats
Convert images to WebP/AVIF and resize to display dimensions to reduce transfer size.
Got: 11.5 MB
Warning::
JavaScript is 2.2 MB — consider code splitting or lazy loading
Large JavaScript bundles delay interactivity. Split code by route or defer non-critical scripts.
Got: 2.2 MB
Info::
Fonts are 828 KB — consider subsetting or using system fonts
Subset fonts to include only used characters, or switch to system font stacks.
Got: 828 KB
Info::
CSS is 277 KB — consider purging unused styles
Remove unused CSS rules with tools like PurgeCSS to reduce stylesheet size.
Got: 277 KB
Warning::
110 HTTP requests — consider bundling or reducing
Each request adds latency. Bundle small files, use sprites, or eliminate unnecessary requests.
Info::
Estimated 5.5 g CO2 per page load
26.4 MB / 2.4 MB budget
26.4 MB transferred
110 requests
5.5 g CO2 per page load
Images 11.5 MiB 44%
Other 11.4 MiB 43%
JavaScript 2.2 MiB 8%
Fonts 828.2 KiB 3%
CSS 277.3 KiB 1%
HTML 247.5 KiB 1%
Other 17.1 KiB 0%
Other 1.5 KiB 0%
Other 1.3 KiB 0%
Other 555 B 0%
Other 0 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

Remove unused CSS rules with tools like PurgeCSS to reduce stylesheet size.

Why this matters

CSS bundle is large — purge unused styles (PurgeCSS, Tailwind JIT) to reduce CSS payload.

Source: web.dev

Each request adds latency. Bundle small files, use sprites, or eliminate unnecessary requests.

Why this matters

High HTTP request count — bundling, sprite-ing, and HTTP/2 server push can reduce per-request overhead.

Source: web.dev

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 (26.4 MiB of 26.4 MiB)
Info::
Third-party blocking time is low (0 ms)
100%
First-party Third-party
D
JS Bundles
Action
25 scripts, 439 KB unused
FIX
25 scripts, 439 KB unused
Warning::
https://www.ou.edu/etc/designs/ou-material/compone...: 109 KB unused (71%)
Consider code splitting or tree shaking to reduce unused code.
Warning::
https://www.googletagmanager.com/gtm.js?id=GTM-PN5...: 83 KB unused (49%)
Consider code splitting or tree shaking to reduce unused code.
Warning::
https://www.googletagmanager.com/gtag/js?id=G-0N6Z...: 63 KB unused (40%)
Consider code splitting or tree shaking to reduce unused code.
Warning::
https://www.googletagmanager.com/gtag/destination?...: 61 KB unused (47%)
Consider code splitting or tree shaking to reduce unused code.
Warning::
https://connect.facebook.net/en_US/bundle/sdk.js/: 54 KB unused (70%)
Consider code splitting or tree shaking to reduce unused code.
Info::
Total unused JavaScript: 439 KB
439 KB unused JavaScript

Downloaded but never executed on this page.

ScriptSizeUnusedMinifiedParty
https://www.ou.edu/etc/designs/ou-material/components/js/vendor.js154 KB109 KB (71%)✓3rd
https://www.googletagmanager.com/gtm.js?id=GTM-PN5HHTP172 KB83 KB (49%)✓3rd
https://www.googletagmanager.com/gtag/js?id=G-0N6ZR0C2QE&cx=c&gtm=4e64h1160 KB63 KB (40%)✓3rd
https://www.googletagmanager.com/gtag/destination?id=DC-12783144&cx=c&gtm=4e64h1129 KB61 KB (47%)✓3rd
https://connect.facebook.net/en_US/bundle/sdk.js/78 KB54 KB (70%)✓3rd
https://www.ou.edu/etc/designs/ou-material/components/js/main.js46 KB35 KB (77%)✓3rd
https://connect.facebook.net/en_US/fbevents.js97 KB33 KB (34%)✓3rd
https://www.ou.edu/etc/designs/ou-material/components/js/runtime.js2 KB—✓3rd
https://static.doubleclick.net/instream/ad_status.js0 KB—✓3rd
https://cdn.jsdelivr.net/npm/cookieconsent@3/build/cookieconsent.min.js?_=17768193601547 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

F
Page Weight Inventory
Action
110 resources · 26.4 MB · 439 KB savings available
FIX
110 resources · 26.4 MB · 439 KB savings available
Warning::
Page weight 25.4 MB over 1MB target
Got: 26.4 MB Expected: ≤ 1 MB
Info::
~439 KB of savings available
Warning::
109 third-party resources (100% of weight)
Info::
13 resources over 200KB
110 resources · 26.4 MiB · 109 third-party 25.4 MiB over 1MB target
Image 44% · 11.5 MiB
Media 43% · 11.4 MiB
JavaScript 8% · 2.2 MiB
Font 3% · 828.2 KiB
CSS 1% · 277.3 KiB
Document 1% · 249.3 KiB
Other 0% · 3.4 KiB

~438.9 KiB of savings available

Remove unused JavaScript: 438.9 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.

C
Image Optimization
Action
22 images, 0 KB saveable
REVIEW
22 images, 0 KB saveable
Warning::
https://www.ou.edu/content/dam/homepage/one/WCOD.s... is missing width/height — may cause layout shift
Set explicit width and height to prevent CLS.
Warning::
https://www.ou.edu/content/dam/news/images/article... is missing width/height — may cause layout shift
Set explicit width and height to prevent CLS.
Warning::
https://www.ou.edu/content/dam/homepage2012/design... is missing width/height — may cause layout shift
Set explicit width and height to prevent CLS.
Warning::
https://www.ou.edu/content/dam/news/images/article... is missing width/height — may cause layout shift
Set explicit width and height to prevent CLS.
22 images 11.5 MB
0 oversized -0 KB
20 legacy format
4 missing dimensions CLS risk

Set explicit width and height to prevent CLS.

Why this matters

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.

Why this matters

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.

Why this matters

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.

Why this matters

Image without explicit width/height — browser can't reserve space; CLS jumps when image loads.

Source: web.dev / Core Web Vitals

C
JS Execution Cost
Action
1732ms total JS execution
REVIEW
1732ms total JS execution
Warning::
Unattributable: 564ms CPU time
Warning::
https://www.ou.edu/: 475ms CPU time
Info::
https://www.googletagmanager.com/gtm.js?id=GTM-PN5...: 159ms CPU time
Info::
https://www.googletagmanager.com/gtag/js?id=G-0N6Z...: 112ms CPU time
Info::
https://www.ou.edu/etc/designs/ou-material/compone...: 101ms CPU time
Warning::
Third-party scripts: 1732ms (100% of total)

Main Thread Breakdown

Other 35% Script Evaluation 32% Style & Layout 19% Script Parsing & Compilation 7%
ScriptTotalScriptingParse/CompileParty
Unattributable564ms6ms0ms3rd
https://www.ou.edu/475ms22ms3ms3rd
https://www.googletagmanager.com/gtm.js?id=GTM-PN5HHTP159ms126ms25ms3rd
https://www.googletagmanager.com/gtag/js?id=G-0N6ZR0C2QE&cx=c&gtm=4e64h1112ms87ms22ms3rd
https://www.ou.edu/etc/designs/ou-material/components/js/main.js101ms52ms6ms3rd
https://www.ou.edu/etc/designs/ou-material/components/js/vendor.js74ms35ms27ms3rd
https://connect.facebook.net/signals/config/2187617654888149?v=2.9.303&r=stable&domain=www.ou.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%2C16871ms62ms8ms3rd
https://www.googletagmanager.com/gtag/destination?id=DC-12783144&cx=c&gtm=4e64h162ms48ms13ms3rd
https://platform.twitter.com/widgets.js61ms48ms3ms3rd
https://www.google-analytics.com/analytics.js54ms17ms2ms3rd
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
18 fonts (828 KB)
PASS
18 fonts (828 KB)
Info::
18 font(s) use font-display: swap (FOUT risk but functional)

Web fonts

18

828 KB total

Render-blocking

0

of 18

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 FCP 2.9 s LCP 10.6 shttps://fonts.gstatic.com/s/roboto/v51/KFO7CnqEu92Fr1ME7kSn66aGLdTylUAMa3yUBHMdazQ.woff2KFO7CnqEu92Fr1ME7kSn66a... https://fonts.gstatic.com/s/roboto/v51/KFO7CnqEu92Fr1ME7kSn66aGLdTylUAMa3yUBHMdazQ.woff2 — 36.7 KiB — 14 ms — font-display: swaphttps://use.typekit.net/af/ceaefe/00000000000000007735acce/31/l?primer=7cdcb44be4a7db8877ffa5c0007b8dd865b3bbc383831fe2ea177f62257a9191&fvd=n7&v=3l https://use.typekit.net/af/ceaefe/00000000000000007735acce/31/l?primer=7cdcb44be4a7db8877ffa5c0007b8dd865b3bbc383831fe2ea177f62257a9191&fvd=n7&v=3 — 21.9 KiB — 57 ms — font-display: swaphttps://use.typekit.net/af/79362f/0000000000000000775b811a/31/l?primer=f592e0a4b9356877842506ce344308576437e4f677d7c9b78ca2162e6cad991a&fvd=n7&v=3l https://use.typekit.net/af/79362f/0000000000000000775b811a/31/l?primer=f592e0a4b9356877842506ce344308576437e4f677d7c9b78ca2162e6cad991a&fvd=n7&v=3 — 39.2 KiB — 38 ms — font-display: swaphttps://use.typekit.net/af/b8c688/0000000000000000775b8116/31/l?primer=f592e0a4b9356877842506ce344308576437e4f677d7c9b78ca2162e6cad991a&fvd=n9&v=3l https://use.typekit.net/af/b8c688/0000000000000000775b8116/31/l?primer=f592e0a4b9356877842506ce344308576437e4f677d7c9b78ca2162e6cad991a&fvd=n9&v=3 — 38.0 KiB — 42 ms — font-display: swaphttps://use.typekit.net/af/d7ef03/00000000000000007735e5b0/31/l?primer=7fa3915bdafdf03041871920a205bef951d72bf64dd4c4460fb992e3ecc3a862&fvd=i7&v=3l https://use.typekit.net/af/d7ef03/00000000000000007735e5b0/31/l?primer=7fa3915bdafdf03041871920a205bef951d72bf64dd4c4460fb992e3ecc3a862&fvd=i7&v=3 — 29.9 KiB — 55 ms — font-display: swaphttps://fonts.gstatic.com/s/roboto/v51/KFO5CnqEu92Fr1Mu53ZEC9_Vu3r1gIhOszmkBnkaSTbQWg.woff2KFO5CnqEu92Fr1Mu53ZEC9_... https://fonts.gstatic.com/s/roboto/v51/KFO5CnqEu92Fr1Mu53ZEC9_Vu3r1gIhOszmkBnkaSTbQWg.woff2 — 40.8 KiB — 15 ms — font-display: swaphttps://fonts.gstatic.com/s/materialicons/v145/flUhRq6tzZclQEJ-Vdg-IuiaDsNcIhQ8tQ.woff2flUhRq6tzZclQEJ-Vdg-Iui... https://fonts.gstatic.com/s/materialicons/v145/flUhRq6tzZclQEJ-Vdg-IuiaDsNcIhQ8tQ.woff2 — 125.6 KiB — 26 ms — font-display: swaphttps://use.typekit.net/af/5071c4/00000000000000007735e5af/31/l?primer=7fa3915bdafdf03041871920a205bef951d72bf64dd4c4460fb992e3ecc3a862&fvd=n7&v=3l https://use.typekit.net/af/5071c4/00000000000000007735e5af/31/l?primer=7fa3915bdafdf03041871920a205bef951d72bf64dd4c4460fb992e3ecc3a862&fvd=n7&v=3 — 27.9 KiB — 52 ms — font-display: swaphttps://fonts.gstatic.com/s/roboto/v48/KFO7CnqEu92Fr1ME7kSn66aGLdTylUAMa3yUBHMdazQ.woff2KFO7CnqEu92Fr1ME7kSn66a... https://fonts.gstatic.com/s/roboto/v48/KFO7CnqEu92Fr1ME7kSn66aGLdTylUAMa3yUBHMdazQ.woff2 — 33.9 KiB — 44 ms — font-display: swaphttps://fonts.gstatic.com/s/roboto/v48/KFO7CnqEu92Fr1ME7kSn66aGLdTylUAMa3yUBHMdazQ.woff2KFO7CnqEu92Fr1ME7kSn66a... https://fonts.gstatic.com/s/roboto/v48/KFO7CnqEu92Fr1ME7kSn66aGLdTylUAMa3yUBHMdazQ.woff2 — 0 B — 39 ms — font-display: swaphttps://fonts.gstatic.com/s/robotoslab/v36/BngMUXZYTXPIvIBgJJSb6ufN5qWr4xCC.woff2BngMUXZYTXPIvIBgJJSb6uf... https://fonts.gstatic.com/s/robotoslab/v36/BngMUXZYTXPIvIBgJJSb6ufN5qWr4xCC.woff2 — 33.4 KiB — 36 ms — font-display: swaphttps://cdnjs.cloudflare.com/ajax/libs/font-awesome/6.6.0/webfonts/fa-solid-900.woff2fa-solid-900.woff2 https://cdnjs.cloudflare.com/ajax/libs/font-awesome/6.6.0/webfonts/fa-solid-900.woff2 — 154.3 KiB — 87 ms — font-display: swaphttps://use.typekit.net/af/9e97d3/00000000000000007735d62a/31/l?primer=7cdcb44be4a7db8877ffa5c0007b8dd865b3bbc383831fe2ea177f62257a9191&fvd=n7&v=3l https://use.typekit.net/af/9e97d3/00000000000000007735d62a/31/l?primer=7cdcb44be4a7db8877ffa5c0007b8dd865b3bbc383831fe2ea177f62257a9191&fvd=n7&v=3 — 26.0 KiB — 50 ms — font-display: swaphttps://cdnjs.cloudflare.com/ajax/libs/font-awesome/6.6.0/webfonts/fa-brands-400.woff2fa-brands-400.woff2 https://cdnjs.cloudflare.com/ajax/libs/font-awesome/6.6.0/webfonts/fa-brands-400.woff2 — 115.9 KiB — 22 ms — font-display: swaphttps://use.typekit.net/af/390dad/000000000000000077359fcb/31/l?primer=7cdcb44be4a7db8877ffa5c0007b8dd865b3bbc383831fe2ea177f62257a9191&fvd=n6&v=3l https://use.typekit.net/af/390dad/000000000000000077359fcb/31/l?primer=7cdcb44be4a7db8877ffa5c0007b8dd865b3bbc383831fe2ea177f62257a9191&fvd=n6&v=3 — 25.9 KiB — 20 ms — font-display: swaphttps://use.typekit.net/af/2756d5/00000000000000007735d630/31/l?primer=7cdcb44be4a7db8877ffa5c0007b8dd865b3bbc383831fe2ea177f62257a9191&fvd=i7&v=3l https://use.typekit.net/af/2756d5/00000000000000007735d630/31/l?primer=7cdcb44be4a7db8877ffa5c0007b8dd865b3bbc383831fe2ea177f62257a9191&fvd=i7&v=3 — 26.7 KiB — 20 ms — font-display: swaphttps://use.typekit.net/af/a9e142/00000000000000007735d61f/31/l?primer=7cdcb44be4a7db8877ffa5c0007b8dd865b3bbc383831fe2ea177f62257a9191&fvd=n4&v=3l https://use.typekit.net/af/a9e142/00000000000000007735d61f/31/l?primer=7cdcb44be4a7db8877ffa5c0007b8dd865b3bbc383831fe2ea177f62257a9191&fvd=n4&v=3 — 25.8 KiB — 25 ms — font-display: swaphttps://use.typekit.net/af/aa0b66/00000000000000007735d626/31/l?primer=7cdcb44be4a7db8877ffa5c0007b8dd865b3bbc383831fe2ea177f62257a9191&fvd=i4&v=3l https://use.typekit.net/af/aa0b66/00000000000000007735d626/31/l?primer=7cdcb44be4a7db8877ffa5c0007b8dd865b3bbc383831fe2ea177f62257a9191&fvd=i4&v=3 — 26.3 KiB — 26 ms — font-display: swap
KFO7CnqEu92Fr1ME7kSn66a... woff2 swap
Size 37 KB
Load time 14 ms
Start 2.6 s
Risk FOUT — text flashes from fallback to web font
l woff2 swap
Size 22 KB
Load time 57 ms
Start 2.7 s
Risk FOUT — text flashes from fallback to web font
l woff2 swap
Size 39 KB
Load time 38 ms
Start 2.7 s
Risk FOUT — text flashes from fallback to web font
l woff2 swap
Size 38 KB
Load time 42 ms
Start 2.7 s
Risk FOUT — text flashes from fallback to web font
l woff2 swap
Size 30 KB
Load time 55 ms
Start 2.7 s
Risk FOUT — text flashes from fallback to web font
KFO5CnqEu92Fr1Mu53ZEC9_... woff2 swap
Size 41 KB
Load time 15 ms
Start 2.7 s
Risk FOUT — text flashes from fallback to web font
flUhRq6tzZclQEJ-Vdg-Iui... woff2 swap
Size 126 KB
Load time 26 ms
Start 2.7 s
Risk FOUT — text flashes from fallback to web font
  • Subset this font — over 100 KB suggests Latin Extended or full glyph coverage that most pages don't need
l woff2 swap
Size 28 KB
Load time 52 ms
Start 2.7 s
Risk FOUT — text flashes from fallback to web font
KFO7CnqEu92Fr1ME7kSn66a... woff2 swap
Size 34 KB
Load time 44 ms
Start 2.8 s
Risk FOUT — text flashes from fallback to web font
KFO7CnqEu92Fr1ME7kSn66a... woff2 swap
Size 0 KB
Load time 39 ms
Start 2.8 s
Risk FOUT — text flashes from fallback to web font
BngMUXZYTXPIvIBgJJSb6uf... woff2 swap
Size 33 KB
Load time 36 ms
Start 2.8 s
Risk FOUT — text flashes from fallback to web font
fa-solid-900.woff2 woff2 swap
Size 154 KB
Load time 87 ms
Start 2.8 s
Risk FOUT — text flashes from fallback to web font
  • Subset this font — over 100 KB suggests Latin Extended or full glyph coverage that most pages don't need
l woff2 swap
Size 26 KB
Load time 50 ms
Start 2.8 s
Risk FOUT — text flashes from fallback to web font
fa-brands-400.woff2 woff2 swap
Size 116 KB
Load time 22 ms
Start 3.1 s
Risk FOUT — text flashes from fallback to web font
  • Subset this font — over 100 KB suggests Latin Extended or full glyph coverage that most pages don't need
l woff2 swap
Size 26 KB
Load time 20 ms
Start 3.2 s
Risk FOUT — text flashes from fallback to web font
l woff2 swap
Size 27 KB
Load time 20 ms
Start 3.2 s
Risk FOUT — text flashes from fallback to web font
l woff2 swap
Size 26 KB
Load time 25 ms
Start 3.2 s
Risk FOUT — text flashes from fallback to web font
l woff2 swap
Size 26 KB
Load time 26 ms
Start 3.2 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)

Fixing the unchecked items could save ~198 KB and ~396 ms

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
No optimization needed
PASS
No optimization needed
Info::
No resource hint issues
Network Waterfall
110 requests over 7495ms
INFO
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h3https://www.facebook.com/privacy_sandbox/pixel/register/trigger/?id=2187617654888149&ev=PageView&dl=https%3A%2F%2Fwww.ou.edu%2F&rl=&if=false&ts=1776819362597&sw=800&sh=600&v=2.9.303&r=stable&ec=0&o=12318&fbp=fb.1.1776819362577.373563960313957114&cs_est=true&ler=empty&cdl=API_unavailable&pmd[title]=The%20University%20of%20Oklahoma&pmd[locale]=en_US&pmd[description]=The%20University%20of%20Oklahoma&plt=4398.799999952316&it=1776819362297&coo=false&expv2[0]=pl0&expv2[1]=el3&expv2[2]=bc1&expv2[3]=ra2&expv2[4]=rp2&expv2[5]=ct3&expv2[6]=hf0&rqm=FGETwww.facebook.com/privacy_sandbox/pi... https://www.facebook.com/privacy_sandbox/pixel/register/trigger/?id=2187617654888149&ev=PageView&dl=https%3A%2F%2Fwww.ou.edu%2F&rl=&if=false&ts=1776819362597&sw=800&sh=600&v=2.9.303&r=stable&ec=0&o=12318&fbp=fb.1.1776819362577.373563960313957114&cs_est=true&ler=empty&cdl=API_unavailable&pmd[title]=The%20University%20of%20Oklahoma&pmd[locale]=en_US&pmd[description]=The%20University%20of%20Oklahoma&plt=4398.799999952316&it=1776819362297&coo=false&expv2[0]=pl0&expv2[1]=el3&expv2[2]=bc1&expv2[3]=ra2&expv2[4]=rp2&expv2[5]=ct3&expv2[6]=hf0&rqm=FGET — 200 — 198 B — 355 ms — h3https://www.ou.edu/content/dam/theres-only-one/oklahoma-web-video-coloring-book-edition.mp4www.ou.edu/content/dam/theres-only-... https://www.ou.edu/content/dam/theres-only-one/oklahoma-web-video-coloring-book-edition.mp4 — 206 — 36.5 KiB — 218 ms — http/1.1https://www.ou.edu/content/dam/theres-only-one/oklahoma-web-video-coloring-book-edition.mp4www.ou.edu/content/dam/theres-only-... https://www.ou.edu/content/dam/theres-only-one/oklahoma-web-video-coloring-book-edition.mp4 — 206 — 5.6 MiB — 0 ms — http/1.1https://www.youtube.com/youtubei/v1/log_event?alt=jsonwww.youtube.com/youtubei/v1/log_eve... https://www.youtube.com/youtubei/v1/log_event?alt=json — 200 — 50 B — 11 ms — h3https://www.youtube.com/youtubei/v1/log_event?alt=jsonwww.youtube.com/youtubei/v1/log_eve... https://www.youtube.com/youtubei/v1/log_event?alt=json — 200 — 50 B — 9 ms — h3https://www.ou.edu/favicon.icowww.ou.edu/favicon.ico https://www.ou.edu/favicon.ico — 200 — 15.2 KiB — 217 ms — http/1.1
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 1732ms · 788KB · $23/mo
Unattributable
Other
Costly
Execution 564ms
Transfer 0 KB
Monthly Cost $7/mo
www.ou.edu
Other
Costly
Execution 475ms
Transfer 33 KB
Monthly Cost $6/mo
Google Tag Manager
Tag Manager
Optional
Execution 159ms
Transfer 172 KB
Unused 49%
Monthly Cost $2/mo
Google Tag Manager
Tag Manager
Optional
Execution 112ms
Transfer 160 KB
Unused 40%
Monthly Cost $1/mo
www.ou.edu
Other
Optional
Execution 101ms
Transfer 46 KB
Unused 77%
Monthly Cost $1/mo
www.ou.edu
Other
Optional
Execution 74ms
Transfer 154 KB
Unused 71%
Monthly Cost $1/mo
Facebook Pixel
Advertising
Optional
Execution 71ms
Transfer 47 KB
Monthly Cost $1/mo
Google Tag Manager
Tag Manager
Optional
Execution 62ms
Transfer 129 KB
Unused 47%
Monthly Cost $1/mo
Twitter/X Embed
Social
Optional
Execution 61ms
Transfer 27 KB
Monthly Cost $1/mo
Google Analytics
Analytics
Optional
Execution 54ms
Transfer 21 KB
Monthly Cost $1/mo

These scripts may cost more than they're worth

  • Unattributable adds 564ms and costs ~$7/month
  • www.ou.edu adds 475ms and costs ~$6/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 564ms 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.ou.edu takes 475ms 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

77% of www.ou.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

71% of www.ou.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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