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Performance

· 17 checks — Lighthouse + waterfall + sustainability rolled into one auditable list.
SCORE
81
GRADE
B
FIX
3
REVIEW
5
PASS
7
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.
91
Accessibility Measures how accessible the page is for users with disabilities. Checks color contrast, ARIA labels, and semantic HTML.
100
Best Practices Checks for modern web development best practices including HTTPS, no console errors, and secure JavaScript.
85
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.

4.93 s

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

8.54 s

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

254 ms

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

0.097

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

5.20 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.

10.11 s

Page Load Progression

375 ms
750 ms
1.1 s
1.5 s
1.9 s
2.2 s
2.6 s
3.0 s
Checks
17
7 PASS 5 REVIEW 3 FIX
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 (1.4 MiB of 1.4 MiB)
Info::
Third-party blocking time is low (0 ms)
100%
First-party Third-party
D
Page Weight Inventory
Action
33 resources · 1.4 MB · 203 KB savings available
FIX
33 resources · 1.4 MB · 203 KB savings available
Warning::
Page weight 395 KB over 1MB target
Got: 1.4 MB Expected: ≤ 1 MB
Info::
~203 KB of savings available
Warning::
32 third-party resources (100% of weight)
Info::
1 resources over 200KB
33 resources · 1.4 MiB · 32 third-party 395.0 KiB over 1MB target
Image 37% · 532.0 KiB
JavaScript 33% · 472.3 KiB
Font 23% · 332.9 KiB
CSS 5% · 69.3 KiB
Document 1% · 11.4 KiB
Other 0% · 1.1 KiB

~203.0 KiB of savings available

Remove unused JavaScript: 203.0 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
Page Weight Budget
1.4 MB transferred, 33 requests
REVIEW
1.4 MB transferred, 33 requests
Info::
Page weighs 2.6 MB (1.4 MB transferred)
Info::
Fonts are 333 KB — consider subsetting or using system fonts
Subset fonts to include only used characters, or switch to system font stacks.
Got: 333 KB
Info::
33 HTTP requests
Info::
Estimated 0.29 g CO2 per page load
1.4 MB / 2.4 MB budget
1.4 MB transferred
33 requests
0.29 g CO2 per page load
Images 526.2 KiB 37%
JavaScript 472.3 KiB 33%
Fonts 332.9 KiB 23%
CSS 69.3 KiB 5%
HTML 11.2 KiB 1%
Other 5.9 KiB 0%
Other 552 B 0%
Other 547 B 0%
0 2.4 MB 4.9 MB
Under budget

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

C
Image Optimization
Action
11 images, 0 KB saveable
REVIEW
11 images, 0 KB saveable
Warning::
https://www.ucar.edu/profiles/custom/ncar_ucar_umb... is missing width/height — may cause layout shift
Set explicit width and height to prevent CLS.
Warning::
https://www.ucar.edu/profiles/custom/ncar_ucar_umb... is missing width/height — may cause layout shift
Set explicit width and height to prevent CLS.
11 images 526 KB
0 oversized -0 KB
5 legacy format
2 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

C
JS Execution Cost
Action
1860ms total JS execution
REVIEW
1860ms total JS execution
Warning::
https://www.ucar.edu/sites/default/files/js/js_RAg...: 732ms CPU time
Warning::
https://www.ucar.edu/: 323ms CPU time
Info::
Unattributable: 227ms CPU time
Info::
https://www.googletagmanager.com/gtag/js?id=G-T9VY...: 206ms CPU time
Info::
https://scripts.clarity.ms/0.8.60-beta/clarity.js: 195ms CPU time
Warning::
Third-party scripts: 1860ms (100% of total)

Main Thread Breakdown

Script Evaluation 55% Other 18% Style & Layout 11% Script Parsing & Compilation 7% Rendering 7%
ScriptTotalScriptingParse/CompileParty
https://www.ucar.edu/sites/default/files/js/js_RAg-zpb8QPCcjKQb5F2HL7w7AWFAYucNfeo_REY9bR8.js?scope=footer&delta=0&language=en&theme=ucar&include=eJxLLY1Pzs_PzkwFUrkFOZmJecmp-qlYBHXS8_PTc1LjE_MScypLMpOL9dEFdLLzi0r1s4p1IXohXBChm5RYnAoAreIpcg732ms481ms47ms3rd
https://www.ucar.edu/323ms7ms1ms3rd
Unattributable227ms65ms0ms3rd
https://www.googletagmanager.com/gtag/js?id=G-T9VYFW1DZL&cx=c&gtm=4e64h1206ms161ms39ms3rd
https://scripts.clarity.ms/0.8.60-beta/clarity.js195ms172ms5ms3rd
https://www.googletagmanager.com/gtag/js?id=UA-332815-87177ms139ms37ms3rd
C
JS Bundles
Action
6 scripts, 203 KB unused
REVIEW
6 scripts, 203 KB unused
Warning::
https://www.ucar.edu/sites/default/files/js/js_RAg...: 75 KB unused (52%)
Consider code splitting or tree shaking to reduce unused code.
Warning::
https://www.googletagmanager.com/gtag/js?id=G-T9VY...: 65 KB unused (42%)
Consider code splitting or tree shaking to reduce unused code.
Warning::
https://www.googletagmanager.com/gtag/js?id=UA-332...: 63 KB unused (50%)
Consider code splitting or tree shaking to reduce unused code.
Info::
Total unused JavaScript: 203 KB
203 KB unused JavaScript

Downloaded but never executed on this page.

ScriptSizeUnusedMinifiedParty
https://www.ucar.edu/sites/default/files/js/js_RAg-zpb8QPCcjKQb5F2HL7w7AWFAYucNfeo_REY9bR8.js?scope=footer&delta=0&language=en&theme=ucar&include=eJxLLY1Pzs_PzkwFUrkFOZmJecmp-qlYBHXS8_PTc1LjE_MScypLMpOL9dEFdLLzi0r1s4p1IXohXBChm5RYnAoAreIpcg143 KB75 KB (52%)✓3rd
https://www.googletagmanager.com/gtag/js?id=G-T9VYFW1DZL&cx=c&gtm=4e64h1157 KB65 KB (42%)✓3rd
https://www.googletagmanager.com/gtag/js?id=UA-332815-87125 KB63 KB (50%)✓3rd
https://www.clarity.ms/tag/ptyiisykfv1 KB—✓3rd
https://www.google-analytics.com/analytics.js21 KB—✓3rd
https://scripts.clarity.ms/0.8.60-beta/clarity.js25 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

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
7 fonts (333 KB)
PASS
7 fonts (333 KB)
Info::
7 font(s) use font-display: swap (FOUT risk but functional)

Web fonts

7

333 KB total

Render-blocking

0

of 7

Dominant font-display

swap

Most common across fonts

Font loading timeline
Transfer FOIT (block) FOUT (swap)
0 ms 1.0 s 2.0 s 3.0 s 4.0 s 5.0 s 6.0 s 7.0 s 8.0 s FCP 4.9 s LCP 8.5 shttps://fonts.gstatic.com/s/poppins/v24/pxiEyp8kv8JHgFVrJJfecnFHGPc.woff2pxiEyp8kv8JHgFVrJJfecnF... https://fonts.gstatic.com/s/poppins/v24/pxiEyp8kv8JHgFVrJJfecnFHGPc.woff2 — 7.7 KiB — 34 ms — font-display: swaphttps://www.ucar.edu/profiles/custom/ncar_ucar_umbrella/themes/custom/koru/libraries/koru-base/lib/fontawesome/webfonts/fa-solid-900.woff2fa-solid-900.woff2 https://www.ucar.edu/profiles/custom/ncar_ucar_umbrella/themes/custom/koru/libraries/koru-base/lib/fontawesome/webfonts/fa-solid-900.woff2 — 155.0 KiB — 29 ms — font-display: swaphttps://fonts.gstatic.com/s/poppins/v24/pxiByp8kv8JHgFVrLEj6Z1xlFd2JQEk.woff2pxiByp8kv8JHgFVrLEj6Z1x... https://fonts.gstatic.com/s/poppins/v24/pxiByp8kv8JHgFVrLEj6Z1xlFd2JQEk.woff2 — 7.8 KiB — 33 ms — font-display: swaphttps://fonts.gstatic.com/s/poppins/v24/pxiByp8kv8JHgFVrLCz7Z1xlFd2JQEk.woff2pxiByp8kv8JHgFVrLCz7Z1x... https://fonts.gstatic.com/s/poppins/v24/pxiByp8kv8JHgFVrLCz7Z1xlFd2JQEk.woff2 — 7.7 KiB — 32 ms — font-display: swaphttps://www.ucar.edu/profiles/custom/ncar_ucar_umbrella/themes/custom/koru/libraries/koru-base/lib/icomoon/fonts/icomoon.ttf?i45ppq=icomoon.ttf https://www.ucar.edu/profiles/custom/ncar_ucar_umbrella/themes/custom/koru/libraries/koru-base/lib/icomoon/fonts/icomoon.ttf?i45ppq= — 13.1 KiB — 13 ms — font-display: swaphttps://www.ucar.edu/profiles/custom/ncar_ucar_umbrella/themes/custom/koru/libraries/koru-base/lib/fontawesome/webfonts/fa-regular-400.woff2fa-regular-400.woff2 https://www.ucar.edu/profiles/custom/ncar_ucar_umbrella/themes/custom/koru/libraries/koru-base/lib/fontawesome/webfonts/fa-regular-400.woff2 — 25.3 KiB — 11 ms — font-display: swaphttps://www.ucar.edu/profiles/custom/ncar_ucar_umbrella/themes/custom/koru/libraries/koru-base/lib/fontawesome/webfonts/fa-brands-400.woff2fa-brands-400.woff2 https://www.ucar.edu/profiles/custom/ncar_ucar_umbrella/themes/custom/koru/libraries/koru-base/lib/fontawesome/webfonts/fa-brands-400.woff2 — 116.2 KiB — 15 ms — font-display: swap
pxiEyp8kv8JHgFVrJJfecnF... woff2 swap
Size 8 KB
Load time 34 ms
Start 600 ms
Risk FOUT — text flashes from fallback to web font
fa-solid-900.woff2 woff2 swap
Size 155 KB
Load time 29 ms
Start 600 ms
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
pxiByp8kv8JHgFVrLEj6Z1x... woff2 swap
Size 8 KB
Load time 33 ms
Start 600 ms
Risk FOUT — text flashes from fallback to web font
pxiByp8kv8JHgFVrLCz7Z1x... woff2 swap
Size 8 KB
Load time 32 ms
Start 603 ms
Risk FOUT — text flashes from fallback to web font
icomoon.ttf ttf swap
Size 13 KB
Load time 13 ms
Start 603 ms
Risk FOUT — text flashes from fallback to web font
  • Convert to woff2 for ~30% smaller file size
fa-regular-400.woff2 woff2 swap
Size 25 KB
Load time 11 ms
Start 603 ms
Risk FOUT — text flashes from fallback to web font
fa-brands-400.woff2 woff2 swap
Size 116 KB
Load time 15 ms
Start 603 ms
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
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 ~140 KB and ~280 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
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
33 requests over 2114ms
INFO
0 ms 1.0 s 2.0 s 3.0 s 4.0 s 5.0 s 6.0 s 7.0 s 8.0 s FCP 4.9 s LCP 8.5 shttps://ucar.edu// https://ucar.edu/ — 301 — 154 B — 431 ms — h2https://www.ucar.edu/www.ucar.edu/ https://www.ucar.edu/ — 200 — 11.2 KiB — 15 ms — h2https://www.googletagmanager.com/gtag/js?id=UA-332815-87www.googletagmanager.com/gtag/js?id... https://www.googletagmanager.com/gtag/js?id=UA-332815-87 — 200 — 125.4 KiB — 137 ms — h2https://www.ucar.edu/sites/default/files/css/css_-d8jtdlHKkjsQUp3LbIPJ9wse9mhG81sFAK9HYeNxYs.css?delta=0&language=en&theme=ucar&include=eJxtjEEOgzAMBD-UkidFhiwQkcSRHbdqX1-ghx7gMiuNvTuxwFeWQjl94GBhYt4S9igtJ6oT_J0METNZ7m5jMX_gMZLCNRJahNqqPoo1ysPfDFabjTnpiui0k3TIlnroKwr8Wb_YAlVaoNdL5bj_v7Wj_Lo2kfgDzsooyJnCLFx7aPuAv3HumfBSf3IoHC3jC_c9ayUwww.ucar.edu/sites/default/files/cs... https://www.ucar.edu/sites/default/files/css/css_-d8jtdlHKkjsQUp3LbIPJ9wse9mhG81sFAK9HYeNxYs.css?delta=0&language=en&theme=ucar&include=eJxtjEEOgzAMBD-UkidFhiwQkcSRHbdqX1-ghx7gMiuNvTuxwFeWQjl94GBhYt4S9igtJ6oT_J0METNZ7m5jMX_gMZLCNRJahNqqPoo1ysPfDFabjTnpiui0k3TIlnroKwr8Wb_YAlVaoNdL5bj_v7Wj_Lo2kfgDzsooyJnCLFx7aPuAv3HumfBSf3IoHC3jC_c9ayU — 200 — 2.9 KiB — 13 ms — h2https://www.ucar.edu/sites/default/files/css/css_MthkyvfFc7iesyc8jPuxJaaSkanYoI0UeRAVP3DieDA.css?delta=1&language=en&theme=ucar&include=eJxtjEEOgzAMBD-UkidFhiwQkcSRHbdqX1-ghx7gMiuNvTuxwFeWQjl94GBhYt4S9igtJ6oT_J0METNZ7m5jMX_gMZLCNRJahNqqPoo1ysPfDFabjTnpiui0k3TIlnroKwr8Wb_YAlVaoNdL5bj_v7Wj_Lo2kfgDzsooyJnCLFx7aPuAv3HumfBSf3IoHC3jC_c9ayUwww.ucar.edu/sites/default/files/cs... https://www.ucar.edu/sites/default/files/css/css_MthkyvfFc7iesyc8jPuxJaaSkanYoI0UeRAVP3DieDA.css?delta=1&language=en&theme=ucar&include=eJxtjEEOgzAMBD-UkidFhiwQkcSRHbdqX1-ghx7gMiuNvTuxwFeWQjl94GBhYt4S9igtJ6oT_J0METNZ7m5jMX_gMZLCNRJahNqqPoo1ysPfDFabjTnpiui0k3TIlnroKwr8Wb_YAlVaoNdL5bj_v7Wj_Lo2kfgDzsooyJnCLFx7aPuAv3HumfBSf3IoHC3jC_c9ayU — 200 — 65.5 KiB — 19 ms — h2https://www.ucar.edu/profiles/custom/ncar_ucar_umbrella/themes/custom/koru/libraries/koru-base/img/logo-ucar.pngwww.ucar.edu/profiles/custom/ncar_u... https://www.ucar.edu/profiles/custom/ncar_ucar_umbrella/themes/custom/koru/libraries/koru-base/img/logo-ucar.png — 200 — 51.4 KiB — 5 ms — h2https://www.ucar.edu/profiles/custom/ncar_ucar_umbrella/themes/custom/koru/libraries/koru-base/img/NSF_Official_logo.pngwww.ucar.edu/profiles/custom/ncar_u... https://www.ucar.edu/profiles/custom/ncar_ucar_umbrella/themes/custom/koru/libraries/koru-base/img/NSF_Official_logo.png — 200 — 209.5 KiB — 10 ms — h2https://www.ucar.edu/sites/default/files/js/js_RAg-zpb8QPCcjKQb5F2HL7w7AWFAYucNfeo_REY9bR8.js?scope=footer&delta=0&language=en&theme=ucar&include=eJxLLY1Pzs_PzkwFUrkFOZmJecmp-qlYBHXS8_PTc1LjE_MScypLMpOL9dEFdLLzi0r1s4p1IXohXBChm5RYnAoAreIpcgwww.ucar.edu/sites/default/files/js... https://www.ucar.edu/sites/default/files/js/js_RAg-zpb8QPCcjKQb5F2HL7w7AWFAYucNfeo_REY9bR8.js?scope=footer&delta=0&language=en&theme=ucar&include=eJxLLY1Pzs_PzkwFUrkFOZmJecmp-qlYBHXS8_PTc1LjE_MScypLMpOL9dEFdLLzi0r1s4p1IXohXBChm5RYnAoAreIpcg — 200 — 143.0 KiB — 15 ms — h2https://www.clarity.ms/tag/ptyiisykfvwww.clarity.ms/tag/ptyiisykfv https://www.clarity.ms/tag/ptyiisykfv — 200 — 848 B — 138 ms — http/1.1https://fonts.googleapis.com/css?family=Poppins:400,600,700fonts.googleapis.com/css?family=Pop... https://fonts.googleapis.com/css?family=Poppins:400,600,700 — 200 — 991 B — 77 ms — h2https://www.ucar.edu/profiles/custom/ncar_ucar_umbrella/themes/custom/koru/libraries/koru-base/img/UCAR-Waves-Lines-Only.pngwww.ucar.edu/profiles/custom/ncar_u... https://www.ucar.edu/profiles/custom/ncar_ucar_umbrella/themes/custom/koru/libraries/koru-base/img/UCAR-Waves-Lines-Only.png — 200 — 30.8 KiB — 5 ms — h2https://www.ucar.edu/sites/default/files/2025-12/December%202025%20UCAR%20Spotlight%20Thumbnail.jpegwww.ucar.edu/sites/default/files/20... https://www.ucar.edu/sites/default/files/2025-12/December%202025%20UCAR%20Spotlight%20Thumbnail.jpeg — 200 — 194.5 KiB — 11 ms — h2https://www.ucar.edu/sites/default/files/big-picture-box/2025-08/Sun%20Earth%20Connections%20%281%29%20%281%29.jpgwww.ucar.edu/sites/default/files/bi... https://www.ucar.edu/sites/default/files/big-picture-box/2025-08/Sun%20Earth%20Connections%20%281%29%20%281%29.jpg — 200 — 26.8 KiB — 12 ms — h2https://fonts.gstatic.com/s/poppins/v24/pxiEyp8kv8JHgFVrJJfecnFHGPc.woff2fonts.gstatic.com/s/poppins/v24/pxi... https://fonts.gstatic.com/s/poppins/v24/pxiEyp8kv8JHgFVrJJfecnFHGPc.woff2 — 200 — 7.7 KiB — 34 ms — h3https://www.ucar.edu/profiles/custom/ncar_ucar_umbrella/themes/custom/koru/libraries/koru-base/lib/fontawesome/webfonts/fa-solid-900.woff2www.ucar.edu/profiles/custom/ncar_u... https://www.ucar.edu/profiles/custom/ncar_ucar_umbrella/themes/custom/koru/libraries/koru-base/lib/fontawesome/webfonts/fa-solid-900.woff2 — 200 — 155.0 KiB — 29 ms — h2https://fonts.gstatic.com/s/poppins/v24/pxiByp8kv8JHgFVrLEj6Z1xlFd2JQEk.woff2fonts.gstatic.com/s/poppins/v24/pxi... https://fonts.gstatic.com/s/poppins/v24/pxiByp8kv8JHgFVrLEj6Z1xlFd2JQEk.woff2 — 200 — 7.8 KiB — 33 ms — h3https://fonts.gstatic.com/s/poppins/v24/pxiByp8kv8JHgFVrLCz7Z1xlFd2JQEk.woff2fonts.gstatic.com/s/poppins/v24/pxi... https://fonts.gstatic.com/s/poppins/v24/pxiByp8kv8JHgFVrLCz7Z1xlFd2JQEk.woff2 — 200 — 7.7 KiB — 32 ms — 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https://www.googletagmanager.com/a?id=G-T9VYFW1DZL&v=3&t=t&pid=1505491520&gtm=45je64h1v9103302364za20g&cv=1&rv=64h1&tc=15&tag_exp=0~115938466~115938468~117266400~117384406&es=1&e=gtag.config&eid=3&u=AAAAAAAAAAAAAAAAAAAAAAE&h=Ag&epr=1G&tr=1gct&ti=2gct&z=0 — 200 — 11 B — 27 ms — h3https://www.googletagmanager.com/a?id=G-T9VYFW1DZL&v=3&t=t&pid=1505491520&gtm=45je64h1v9103302364za20g&cv=1&rv=64h1&tc=15&tag_exp=0~115938466~115938468~117266400~117384406&es=1&e=gtag.config&eid=5&u=AAAAAAAAAAAAAAAAAAAAAAE&h=Ag&z=0www.googletagmanager.com/a?id=G-T9V... https://www.googletagmanager.com/a?id=G-T9VYFW1DZL&v=3&t=t&pid=1505491520&gtm=45je64h1v9103302364za20g&cv=1&rv=64h1&tc=15&tag_exp=0~115938466~115938468~117266400~117384406&es=1&e=gtag.config&eid=5&u=AAAAAAAAAAAAAAAAAAAAAAE&h=Ag&z=0 — 200 — 11 B — 29 ms — h3https://www.googletagmanager.com/a?id=G-T9VYFW1DZL&v=3&t=t&pid=1505491520&gtm=45je64h1v9103302364za20g&cv=1&rv=64h1&tc=15&tag_exp=0~115938466~115938468~117266400~117384406&es=1&e=gtag.config&eid=6&u=AAAAAAAAAAAAAAAAAAAAAAEAAAAAAAAF&h=Ag&z=0www.googletagmanager.com/a?id=G-T9V... https://www.googletagmanager.com/a?id=G-T9VYFW1DZL&v=3&t=t&pid=1505491520&gtm=45je64h1v9103302364za20g&cv=1&rv=64h1&tc=15&tag_exp=0~115938466~115938468~117266400~117384406&es=1&e=gtag.config&eid=6&u=AAAAAAAAAAAAAAAAAAAAAAEAAAAAAAAF&h=Ag&z=0 — 200 — 11 B — 28 ms — h3https://region1.google-analytics.com/g/collect?v=2&tid=G-T9VYFW1DZL&gtm=45je64h1v9103302364za20g&_p=1776815105199&gcd=13l3l3l2l1l1&npa=1&dma_cps=a&dma=1&gdid=dMDhkMT&_eu=AAAI&are=1&cid=1237631508.1776815106&frm=0&pscdl=noapi&rcb=4&sr=412x823&uaa=&uab=64&uafvl=Chromium%3B147.0.7727.101%7CNot.A%252FBrand%3B8.0.0.0&uam=moto%20g%20power%20(2022)&uamb=1&uap=Android&uapv=11.0&uaw=0&ul=en-us&_s=1&tag_exp=0~115938466~115938468~117266400~117384406~117512542&sid=1776815105&sct=1&seg=0&dl=https%3A%2F%2Fwww.ucar.edu%2F&dt=University%20Corporation%20for%20Atmospheric%20Research%20%7C%20University%20Corporation%20for%20Atmospheric%20Research&en=page_view&_fv=1&_nsi=1&_ss=1&tfd=873region1.google-analytics.com/g/coll... https://region1.google-analytics.com/g/collect?v=2&tid=G-T9VYFW1DZL&gtm=45je64h1v9103302364za20g&_p=1776815105199&gcd=13l3l3l2l1l1&npa=1&dma_cps=a&dma=1&gdid=dMDhkMT&_eu=AAAI&are=1&cid=1237631508.1776815106&frm=0&pscdl=noapi&rcb=4&sr=412x823&uaa=&uab=64&uafvl=Chromium%3B147.0.7727.101%7CNot.A%252FBrand%3B8.0.0.0&uam=moto%20g%20power%20(2022)&uamb=1&uap=Android&uapv=11.0&uaw=0&ul=en-us&_s=1&tag_exp=0~115938466~115938468~117266400~117384406~117512542&sid=1776815105&sct=1&seg=0&dl=https%3A%2F%2Fwww.ucar.edu%2F&dt=University%20Corporation%20for%20Atmospheric%20Research%20%7C%20University%20Corporation%20for%20Atmospheric%20Research&en=page_view&_fv=1&_nsi=1&_ss=1&tfd=873 — 204 — 547 B — 72 ms — h2https://www.googletagmanager.com/a?id=G-T9VYFW1DZL&v=3&t=t&pid=1505491520&gtm=45je64h1v9103302364za20g&cv=1&rv=64h1&tc=15&tag_exp=0~115938466~115938468~117266400~117384406~117512542&es=1&e=gtm.dom&eid=7&u=AAAAAAAAAAAAACCAAAEAAAEAAAAAAAAF&h=Ag&z=0www.googletagmanager.com/a?id=G-T9V... https://www.googletagmanager.com/a?id=G-T9VYFW1DZL&v=3&t=t&pid=1505491520&gtm=45je64h1v9103302364za20g&cv=1&rv=64h1&tc=15&tag_exp=0~115938466~115938468~117266400~117384406~117512542&es=1&e=gtm.dom&eid=7&u=AAAAAAAAAAAAACCAAAEAAAEAAAAAAAAF&h=Ag&z=0 — 200 — 11 B — 24 ms — h3https://www.ucar.edu/profiles/custom/ncar_ucar_umbrella/themes/custom/koru/libraries/koru-base/img/app-favicons/ucar/favicon.icowww.ucar.edu/profiles/custom/ncar_u... https://www.ucar.edu/profiles/custom/ncar_ucar_umbrella/themes/custom/koru/libraries/koru-base/img/app-favicons/ucar/favicon.ico — 200 — 5.7 KiB — 7 ms — h2https://k.clarity.ms/collectk.clarity.ms/collect https://k.clarity.ms/collect — 204 — 276 B — 460 ms — http/1.1https://k.clarity.ms/collectk.clarity.ms/collect https://k.clarity.ms/collect — 204 — 276 B — 99 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 1860ms · 462KB · $25/mo
www.ucar.edu
Other
Costly
Execution 732ms
Transfer 143 KB
Unused 52%
Monthly Cost $10/mo
www.ucar.edu
Other
Costly
Execution 323ms
Transfer 11 KB
Monthly Cost $4/mo
Unattributable
Other
Costly
Execution 227ms
Transfer 0 KB
Monthly Cost $3/mo
Google Tag Manager
Tag Manager
Costly
Execution 206ms
Transfer 157 KB
Unused 42%
Monthly Cost $3/mo
Microsoft Clarity
Session Replay
Optional
Execution 195ms
Transfer 25 KB
Monthly Cost $3/mo
Google Tag Manager
Tag Manager
Optional
Execution 177ms
Transfer 125 KB
Unused 50%
Monthly Cost $2/mo

These scripts may cost more than they're worth

  • www.ucar.edu adds 732ms and costs ~$10/month
  • www.ucar.edu adds 323ms and costs ~$4/month
  • Unattributable adds 227ms and costs ~$3/month
  • Google Tag Manager adds 206ms and costs ~$3/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

www.ucar.edu takes 732ms 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

52% of www.ucar.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

www.ucar.edu takes 323ms 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

Unattributable takes 227ms 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 206ms 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

50% of Google Tag Manager'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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