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Performance

· 17 checks — Lighthouse + waterfall + sustainability rolled into one auditable list.
SCORE
67
GRADE
D
FIX
6
REVIEW
2
PASS
7
INFO
2

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

Mobile Desktop
29
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.
100
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.

8.31 s

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

25.78 s

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

1.80 s

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.

8.76 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.

30.83 s

Page Load Progression

384 ms
768 ms
1.2 s
1.5 s
1.9 s
2.3 s
2.7 s
3.1 s
Checks
17
7 PASS 2 REVIEW 6 FIX
F
Page Weight Budget
Action
4.4 MB transferred, 60 requests
FIX
4.4 MB transferred, 60 requests
Critical::
Page weighs 9.6 MB (4.4 MB transferred)
Warning::
JavaScript is 3.2 MB — consider code splitting or lazy loading
Large JavaScript bundles delay interactivity. Split code by route or defer non-critical scripts.
Got: 3.2 MB
Info::
Fonts are 767 KB — consider subsetting or using system fonts
Subset fonts to include only used characters, or switch to system font stacks.
Got: 767 KB
Info::
CSS is 267 KB — consider purging unused styles
Remove unused CSS rules with tools like PurgeCSS to reduce stylesheet size.
Got: 267 KB
Info::
60 HTTP requests
Info::
Estimated 0.91 g CO2 per page load
4.4 MB / 2.4 MB budget
4.4 MB transferred
60 requests
0.91 g CO2 per page load
JavaScript 3.2 MiB 73%
Fonts 767.4 KiB 17%
CSS 267.1 KiB 6%
Images 47.0 KiB 1%
Other 39.4 KiB 1%
Other 35.1 KiB 1%
HTML 33.9 KiB 1%
Other 8.1 KiB 0%
0 2.4 MB 4.9 MB
Over budget

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

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 (4.4 MiB of 4.4 MiB)
Info::
Third-party blocking time is low (0 ms)
100%
First-party Third-party
F
JS Execution Cost
Action
4594ms total JS execution
FIX
4594ms total JS execution
Warning::
https://www.googletagmanager.com/gtm.js?id=GTM-53V...: 1249ms CPU time
Warning::
Unattributable: 663ms CPU time
Warning::
https://www.uptodate.com/app/dist/pace-B_2Z1FtK.mi...: 645ms CPU time
Warning::
https://www.gstatic.com/recaptcha/releases/gTpTIWh...: 615ms CPU time
Warning::
https://www.googletagmanager.com/gtm.js?id=GTM-TRZ...: 564ms CPU time
Warning::
Third-party scripts: 4594ms (100% of total)

Main Thread Breakdown

Script Evaluation 69% Other 15% Style & Layout 7% Script Parsing & Compilation 4%
ScriptTotalScriptingParse/CompileParty
https://www.googletagmanager.com/gtm.js?id=GTM-53VFLLN1249ms1180ms42ms3rd
Unattributable663ms205ms0ms3rd
https://www.uptodate.com/app/dist/pace-B_2Z1FtK.min.js645ms567ms0ms3rd
https://www.gstatic.com/recaptcha/releases/gTpTIWhbKpxADzTzkcabhXN4/recaptcha__en.js615ms528ms72ms3rd
https://www.googletagmanager.com/gtm.js?id=GTM-TRZFQ4N&gtm=4e64h1564ms500ms39ms3rd
https://www.uptodate.com/login502ms4ms1ms3rd
https://cdn.cookielaw.org/scripttemplates/202504.1.0/otBannerSdk.js266ms190ms42ms3rd
https://www.uptodate.com/app/assets/utd-all-C4EXBBMH.css90ms0ms0ms3rd
F
JS Bundles
Action
18 scripts, 2.2 MB unused
FIX
18 scripts, 2.2 MB unused
Warning::
https://www.uptodate.com/app/dist/utd-all-BtFJPR2f...: 979 KB unused (74%)
Consider code splitting or tree shaking to reduce unused code.
Warning::
https://www.uptodate.com/app/dist/vendor-DMdb3ILA....: 387 KB unused (57%)
Consider code splitting or tree shaking to reduce unused code.
Warning::
https://www.gstatic.com/recaptcha/releases/gTpTIWh...: 176 KB unused (49%)
Consider code splitting or tree shaking to reduce unused code.
Warning::
https://www.gstatic.com/recaptcha/releases/gTpTIWh...: 176 KB unused (49%)
Consider code splitting or tree shaking to reduce unused code.
Warning::
https://www.gstatic.com/recaptcha/releases/gTpTIWh...: 176 KB unused (49%)
Consider code splitting or tree shaking to reduce unused code.
Info::
Total unused JavaScript: 2.2 MB
2243 KB unused JavaScript

Downloaded but never executed on this page.

ScriptSizeUnusedMinifiedParty
https://www.uptodate.com/app/dist/utd-all-BtFJPR2f.min.js1319 KB979 KB (74%)✓3rd
https://www.uptodate.com/app/dist/vendor-DMdb3ILA.min.js679 KB387 KB (57%)✓3rd
https://www.gstatic.com/recaptcha/releases/gTpTIWhbKpxADzTzkcabhXN4/recaptcha__en.js0 KB176 KB (49%)✓3rd
https://www.gstatic.com/recaptcha/releases/gTpTIWhbKpxADzTzkcabhXN4/recaptcha__en.js0 KB176 KB (49%)✓3rd
https://www.gstatic.com/recaptcha/releases/gTpTIWhbKpxADzTzkcabhXN4/recaptcha__en.js362 KB176 KB (49%)✓3rd
https://www.gstatic.com/recaptcha/releases/gTpTIWhbKpxADzTzkcabhXN4/recaptcha__en.js362 KB176 KB (49%)✓3rd
https://cdn.cookielaw.org/scripttemplates/202504.1.0/otBannerSdk.js118 KB60 KB (51%)✓3rd
https://www.googletagmanager.com/gtm.js?id=GTM-TRZFQ4N&gtm=4e64h1153 KB58 KB (38%)✓3rd
https://www.googletagmanager.com/gtm.js?id=GTM-53VFLLN153 KB56 KB (37%)✓3rd
https://cdn.cookielaw.org/scripttemplates/otSDKStub.js9 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
60 resources · 4.4 MB · 2.2 MB savings available
FIX
60 resources · 4.4 MB · 2.2 MB savings available
Warning::
Page weight 3.4 MB over 1MB target
Got: 4.4 MB Expected: ≤ 1 MB
Info::
~2.2 MB of savings available
Warning::
59 third-party resources (100% of weight)
Info::
5 resources over 200KB
60 resources · 4.4 MiB · 59 third-party 3.4 MiB over 1MB target
JavaScript 73% · 3.2 MiB
Font 17% · 767.4 KiB
CSS 6% · 271.6 KiB
Other 2% · 71.7 KiB
Image 1% · 52.3 KiB
Document 1% · 35.0 KiB

~2.2 MiB of savings available

Remove unused JavaScript: 2.2 MiB
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
15 images, 0 KB saveable
REVIEW
15 images, 0 KB saveable
Warning::
https://www.uptodate.com/app/utd-menu/utd-logo.svg is missing width/height — may cause layout shift
Set explicit width and height to prevent CLS.
15 images 47 KB
0 oversized -0 KB
13 legacy format
1 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

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
6 fonts (767 KB)
PASS
6 fonts (767 KB)
Info::
6 font(s) use font-display: swap (FOUT risk but functional)

Web fonts

6

767 KB total

Render-blocking

0

of 6

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 22.0 s 24.0 s 26.0 s FCP 8.3 s LCP 25.8 shttps://www.uptodate.com/app/assets/NotoSans-Regular-CUnezwo1.woff2NotoSans-Regular-CUnezw... https://www.uptodate.com/app/assets/NotoSans-Regular-CUnezwo1.woff2 — 165.3 KiB — 71 ms — font-display: swaphttps://www.uptodate.com/app/assets/NotoSans-Bold-CjI8rmzb.woff2NotoSans-Bold-CjI8rmzb.... https://www.uptodate.com/app/assets/NotoSans-Bold-CjI8rmzb.woff2 — 163.4 KiB — 71 ms — font-display: swaphttps://www.uptodate.com/app/assets/wk-icons-8dBf3Vus.woff2wk-icons-8dBf3Vus.woff2 https://www.uptodate.com/app/assets/wk-icons-8dBf3Vus.woff2 — 34.9 KiB — 76 ms — font-display: swaphttps://www.uptodate.com/app/assets/NotoSans-SemiBold-eeohmkRK.woff2NotoSans-SemiBold-eeohm... https://www.uptodate.com/app/assets/NotoSans-SemiBold-eeohmkRK.woff2 — 167.9 KiB — 190 ms — font-display: swaphttps://www.uptodate.com/app/assets/wk-icons-open-I9AnqcVf.woffwk-icons-open-I9AnqcVf.... https://www.uptodate.com/app/assets/wk-icons-open-I9AnqcVf.woff — 71.2 KiB — 53 ms — font-display: swaphttps://www.uptodate.com/app/assets/NotoSans-Light-DzqmUfbq.woff2NotoSans-Light-DzqmUfbq... https://www.uptodate.com/app/assets/NotoSans-Light-DzqmUfbq.woff2 — 164.8 KiB — 83 ms — font-display: swap
NotoSans-Regular-CUnezw... woff2 swap
Size 165 KB
Load time 71 ms
Start 1.6 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
NotoSans-Bold-CjI8rmzb.... woff2 swap
Size 163 KB
Load time 71 ms
Start 1.6 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
wk-icons-8dBf3Vus.woff2 woff2 swap
Size 35 KB
Load time 76 ms
Start 1.6 s
Risk FOUT — text flashes from fallback to web font
NotoSans-SemiBold-eeohm... woff2 swap
Size 168 KB
Load time 190 ms
Start 1.6 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
wk-icons-open-I9AnqcVf.... woff swap
Size 71 KB
Load time 53 ms
Start 1.6 s
Risk FOUT — text flashes from fallback to web font
  • Convert to woff2 for ~30% smaller file size
NotoSans-Light-DzqmUfbq... woff2 swap
Size 165 KB
Load time 83 ms
Start 1.6 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
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 ~352 KB and ~704 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
60 requests over 3455ms
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 22.0 s 24.0 s 26.0 s FCP 8.3 s LCP 25.8 shttps://uptodate.com// https://uptodate.com/ — 301 — 555 B — 557 ms — http/1.1https://www.uptodate.com/www.uptodate.com/ https://www.uptodate.com/ — 301 — 560 B — 110 ms — http/1.1https://www.uptodate.com/indexwww.uptodate.com/index https://www.uptodate.com/index — 302 — 2.3 KiB — 66 ms — http/1.1https://www.uptodate.com/loginwww.uptodate.com/login https://www.uptodate.com/login — 200 — 3.9 KiB — 38 ms — http/1.1https://www.google.com/recaptcha/enterprise.js?render=explicitwww.google.com/recaptcha/enterprise... https://www.google.com/recaptcha/enterprise.js?render=explicit — 200 — 1.0 KiB — 61 ms — h3https://www.uptodate.com/app/dist/DOM-Cws02s0j.min.jswww.uptodate.com/app/dist/DOM-Cws02... https://www.uptodate.com/app/dist/DOM-Cws02s0j.min.js — 200 — 88.1 KiB — 103 ms — http/1.1https://www.uptodate.com/app/dist/epic-ClRhenuO.min.jswww.uptodate.com/app/dist/epic-ClRh... https://www.uptodate.com/app/dist/epic-ClRhenuO.min.js — 200 — 3.5 KiB — 106 ms — http/1.1https://www.uptodate.com/app/assets/utd-all-C4EXBBMH.csswww.uptodate.com/app/assets/utd-all... https://www.uptodate.com/app/assets/utd-all-C4EXBBMH.css — 200 — 218.7 KiB — 266 ms — http/1.1https://www.uptodate.com/app/dist/index-CEWs5uCT.min.jswww.uptodate.com/app/dist/index-CEW... https://www.uptodate.com/app/dist/index-CEWs5uCT.min.js — 200 — 2.8 KiB — 105 ms — http/1.1https://www.uptodate.com/app/dist/vendor-DMdb3ILA.min.jswww.uptodate.com/app/dist/vendor-DM... https://www.uptodate.com/app/dist/vendor-DMdb3ILA.min.js — 200 — 679.3 KiB — 389 ms — http/1.1https://www.uptodate.com/app/dist/utd-all-BtFJPR2f.min.jswww.uptodate.com/app/dist/utd-all-B... https://www.uptodate.com/app/dist/utd-all-BtFJPR2f.min.js — 200 — 1.3 MiB — 563 ms — http/1.1https://www.gstatic.com/recaptcha/releases/gTpTIWhbKpxADzTzkcabhXN4/recaptcha__en.jswww.gstatic.com/recaptcha/releases/... https://www.gstatic.com/recaptcha/releases/gTpTIWhbKpxADzTzkcabhXN4/recaptcha__en.js — 200 — 362.4 KiB — 183 ms — h2https://www.uptodate.com/app/utd-menu/utd-icon.pngwww.uptodate.com/app/utd-menu/utd-i... https://www.uptodate.com/app/utd-menu/utd-icon.png — 200 — 2.2 KiB — 37 ms — http/1.1https://www.uptodate.com/app/dist/pace-B_2Z1FtK.min.jswww.uptodate.com/app/dist/pace-B_2Z... https://www.uptodate.com/app/dist/pace-B_2Z1FtK.min.js — 200 — 15.6 KiB — 38 ms — http/1.1https://www.uptodate.com/app/utd-menu/utd-icon-redesign.pngwww.uptodate.com/app/utd-menu/utd-i... https://www.uptodate.com/app/utd-menu/utd-icon-redesign.png — 200 — 4.7 KiB — 37 ms — http/1.1https://www.uptodate.com/services/app/init/json?id=YXBwQ29udGFpbmVywww.uptodate.com/services/app/init/... https://www.uptodate.com/services/app/init/json?id=YXBwQ29udGFpbmVy — 200 — 9.6 KiB — 43 ms — http/1.1https://www.uptodate.com/app/utd-menu/wk-wheel-icon.svgwww.uptodate.com/app/utd-menu/wk-wh... https://www.uptodate.com/app/utd-menu/wk-wheel-icon.svg — 200 — 4.3 KiB — 39 ms — http/1.1https://www.uptodate.com/app/utd-menu/utd-logo.svgwww.uptodate.com/app/utd-menu/utd-l... https://www.uptodate.com/app/utd-menu/utd-logo.svg — 200 — 8.3 KiB — 39 ms — http/1.1https://www.uptodate.com/app/assets/WK-Logo-7lXiX5v8.svgwww.uptodate.com/app/assets/WK-Logo... https://www.uptodate.com/app/assets/WK-Logo-7lXiX5v8.svg — 200 — 9.9 KiB — 36 ms — http/1.1https://www.uptodate.com/app/assets/NotoSans-Regular-CUnezwo1.woff2www.uptodate.com/app/assets/NotoSan... https://www.uptodate.com/app/assets/NotoSans-Regular-CUnezwo1.woff2 — 200 — 165.3 KiB — 71 ms — http/1.1https://www.uptodate.com/app/assets/NotoSans-Bold-CjI8rmzb.woff2www.uptodate.com/app/assets/NotoSan... https://www.uptodate.com/app/assets/NotoSans-Bold-CjI8rmzb.woff2 — 200 — 163.4 KiB — 71 ms — http/1.1https://www.uptodate.com/app/assets/wk-icons-8dBf3Vus.woff2www.uptodate.com/app/assets/wk-icon... https://www.uptodate.com/app/assets/wk-icons-8dBf3Vus.woff2 — 200 — 34.9 KiB — 76 ms — http/1.1https://www.uptodate.com/app/assets/NotoSans-SemiBold-eeohmkRK.woff2www.uptodate.com/app/assets/NotoSan... https://www.uptodate.com/app/assets/NotoSans-SemiBold-eeohmkRK.woff2 — 200 — 167.9 KiB — 190 ms — http/1.1https://www.uptodate.com/services/app/localization/file?lang=frwww.uptodate.com/services/app/local... https://www.uptodate.com/services/app/localization/file?lang=fr — 200 — 23.3 KiB — 39 ms — http/1.1https://www.uptodate.com/services/app/event/login/json?source=login-subscribe-view&isCaptchaSectionVisible=falsewww.uptodate.com/services/app/event... https://www.uptodate.com/services/app/event/login/json?source=login-subscribe-view&isCaptchaSectionVisible=false — 204 — 1.7 KiB — 37 ms — http/1.1https://www.uptodate.com/services/app/config/footer/jsonwww.uptodate.com/services/app/confi... https://www.uptodate.com/services/app/config/footer/json — 200 — 2.5 KiB — 72 ms — http/1.1https://www.uptodate.com/contents/assets/css/UTD_gx_gen.csswww.uptodate.com/contents/assets/cs... https://www.uptodate.com/contents/assets/css/UTD_gx_gen.css — 200 — 6.7 KiB — 60 ms — http/1.1https://cdn.cookielaw.org/consent/560a8aa4-c54c-486f-9bc4-35a3f22bacd9/OtAutoBlock.jscdn.cookielaw.org/consent/560a8aa4-... https://cdn.cookielaw.org/consent/560a8aa4-c54c-486f-9bc4-35a3f22bacd9/OtAutoBlock.js — 200 — 2.3 KiB — 103 ms — h2https://cdn.cookielaw.org/scripttemplates/otSDKStub.jscdn.cookielaw.org/scripttemplates/o... https://cdn.cookielaw.org/scripttemplates/otSDKStub.js — 200 — 9.1 KiB — 99 ms — h2data:image/svg+xml;base64,PHN2ZyB3aWR0aD0iMjQiIGhlaWdodD0iMjQiIHZpZXdCb3g9IjAgMCAyNCAyNCIgZmlsbD0ib…data:image/svg+xml;base64,PHN2ZyB3a... data:image/svg+xml;base64,PHN2ZyB3aWR0aD0iMjQiIGhlaWdodD0iMjQiIHZpZXdCb3g9IjAgMCAyNCAyNCIgZmlsbD0ib… — 200 — 0 B — 0 ms — data
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 22.0 s 24.0 s 26.0 s FCP 8.3 s LCP 25.8 shttps://uptodate.com// https://uptodate.com/ — 301 — 555 B — 557 ms — http/1.1https://www.uptodate.com/www.uptodate.com/ https://www.uptodate.com/ — 301 — 560 B — 110 ms — http/1.1https://www.uptodate.com/indexwww.uptodate.com/index https://www.uptodate.com/index — 302 — 2.3 KiB — 66 ms — http/1.1https://www.uptodate.com/loginwww.uptodate.com/login https://www.uptodate.com/login — 200 — 3.9 KiB — 38 ms — http/1.1https://www.google.com/recaptcha/enterprise.js?render=explicitwww.google.com/recaptcha/enterprise... https://www.google.com/recaptcha/enterprise.js?render=explicit — 200 — 1.0 KiB — 61 ms — h3https://www.uptodate.com/app/dist/DOM-Cws02s0j.min.jswww.uptodate.com/app/dist/DOM-Cws02... https://www.uptodate.com/app/dist/DOM-Cws02s0j.min.js — 200 — 88.1 KiB — 103 ms — http/1.1https://www.uptodate.com/app/dist/epic-ClRhenuO.min.jswww.uptodate.com/app/dist/epic-ClRh... https://www.uptodate.com/app/dist/epic-ClRhenuO.min.js — 200 — 3.5 KiB — 106 ms — http/1.1https://www.uptodate.com/app/assets/utd-all-C4EXBBMH.csswww.uptodate.com/app/assets/utd-all... https://www.uptodate.com/app/assets/utd-all-C4EXBBMH.css — 200 — 218.7 KiB — 266 ms — http/1.1https://www.uptodate.com/app/dist/index-CEWs5uCT.min.jswww.uptodate.com/app/dist/index-CEW... https://www.uptodate.com/app/dist/index-CEWs5uCT.min.js — 200 — 2.8 KiB — 105 ms — http/1.1https://www.uptodate.com/app/dist/vendor-DMdb3ILA.min.jswww.uptodate.com/app/dist/vendor-DM... https://www.uptodate.com/app/dist/vendor-DMdb3ILA.min.js — 200 — 679.3 KiB — 389 ms — http/1.1https://www.uptodate.com/app/dist/utd-all-BtFJPR2f.min.jswww.uptodate.com/app/dist/utd-all-B... https://www.uptodate.com/app/dist/utd-all-BtFJPR2f.min.js — 200 — 1.3 MiB — 563 ms — http/1.1https://www.gstatic.com/recaptcha/releases/gTpTIWhbKpxADzTzkcabhXN4/recaptcha__en.jswww.gstatic.com/recaptcha/releases/... 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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 4594ms · 662KB · $61/mo
Google Tag Manager
Tag Manager
Costly
Execution 1249ms
Transfer 153 KB
Unused 37%
Monthly Cost $17/mo
Unattributable
Other
Costly
Execution 663ms
Transfer 0 KB
Monthly Cost $9/mo
www.uptodate.com
Other
Costly
Execution 645ms
Transfer 16 KB
Monthly Cost $9/mo
www.gstatic.com
Other
Costly
Execution 615ms
Transfer 0 KB
Unused 49%
Monthly Cost $8/mo
Google Tag Manager
Tag Manager
Costly
Execution 564ms
Transfer 153 KB
Unused 38%
Monthly Cost $7/mo
www.uptodate.com
Other
Costly
Execution 502ms
Transfer 4 KB
Monthly Cost $7/mo
OneTrust
Consent
Essential
Execution 266ms
Transfer 118 KB
Unused 51%
Monthly Cost $4/mo
www.uptodate.com
Other
Optional
Execution 90ms
Transfer 219 KB
Monthly Cost $1/mo

These scripts may cost more than they're worth

  • Google Tag Manager adds 1249ms and costs ~$17/month
  • Unattributable adds 663ms and costs ~$9/month
  • www.uptodate.com adds 645ms and costs ~$9/month
  • www.gstatic.com adds 615ms and costs ~$8/month
  • Google Tag Manager adds 564ms and costs ~$7/month
  • www.uptodate.com adds 502ms and costs ~$7/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.

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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

Google Tag Manager takes 1249ms 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 663ms 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.uptodate.com takes 645ms 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.gstatic.com takes 615ms 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 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.uptodate.com takes 502ms 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

51% of OneTrust'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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