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https://dukeupress.edu

Performance

· 17 checks — Lighthouse + waterfall + sustainability rolled into one auditable list.
SCORE
86
GRADE
B
FIX
3
REVIEW
4
PASS
8
INFO
2

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

83
Performance Overall performance score (0–100) based on Core Web Vitals and other metrics. 90+ is good.
94
Accessibility Measures how accessible the page is for users with disabilities. Checks color contrast, ARIA labels, and semantic HTML.
96
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.

3.27 s

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

3.65 s

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

55 ms

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

0.001

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

3.27 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.

7.43 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
8 PASS 4 REVIEW 3 FIX
D
Third-Party Impact
Action
77% third-party, 0 ms blocking
FIX
77% third-party, 0 ms blocking
Warning::
Third-party code accounts for 77% of page weight (1.1 MiB of 1.4 MiB)
Info::
Third-party blocking time is low (0 ms)
23%
77%
First-party Third-party
D
Page Weight Inventory
Action
59 resources · 1.4 MB · 141 KB savings available
FIX
59 resources · 1.4 MB · 141 KB savings available
Warning::
Page weight 427 KB over 1MB target
Got: 1.4 MB Expected: ≤ 1 MB
Info::
~141 KB of savings available
Warning::
46 third-party resources (77% of weight)
Info::
1 resources over 200KB
59 resources · 1.4 MiB · 46 third-party 426.7 KiB over 1MB target
Image 40% · 587.1 KiB
Font 24% · 349.2 KiB
JavaScript 18% · 262.8 KiB
Document 16% · 226.9 KiB
CSS 2% · 21.9 KiB
Other 0% · 2.8 KiB

~140.6 KiB of savings available

Remove unused JavaScript: 140.6 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, 59 requests
REVIEW
1.4 MB transferred, 59 requests
Info::
Page weighs 1.8 MB (1.4 MB transferred)
Info::
Fonts are 349 KB — consider subsetting or using system fonts
Subset fonts to include only used characters, or switch to system font stacks.
Got: 349 KB
Info::
59 HTTP requests
Info::
Estimated 0.30 g CO2 per page load
1.4 MB / 2.4 MB budget
1.4 MB transferred
59 requests
0.30 g CO2 per page load
Images 584.9 KiB 40%
Fonts 349.2 KiB 24%
JavaScript 262.8 KiB 18%
HTML 226.9 KiB 16%
CSS 21.9 KiB 2%
Other 2.8 KiB 0%
Other 2.2 KiB 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

B
JS Execution Cost
952ms total JS execution
REVIEW
952ms total JS execution
Warning::
https://dukeupress.edu/: 487ms CPU time
Info::
Unattributable: 236ms CPU time
Info::
https://www.googletagmanager.com/gtag/js?id=G-0FJ5...: 229ms CPU time
Info::
Third-party scripts: 465ms (49% of total)

Main Thread Breakdown

Style & Layout 33% Other 27% Script Evaluation 23% Parse HTML & CSS 6% Script Parsing & Compilation 4% Rendering 4%
ScriptTotalScriptingParse/CompileParty
https://dukeupress.edu/487ms21ms1ms1st
Unattributable236ms7ms0ms3rd
https://www.googletagmanager.com/gtag/js?id=G-0FJ5H8908M229ms172ms33ms3rd
B
JS Bundles
10 scripts, 141 KB unused
REVIEW
10 scripts, 141 KB unused
Warning::
https://dukeupress.edu/dist/vendor.bundle.js?v=BHA...: 75 KB unused (88%)
Consider code splitting or tree shaking to reduce unused code.
Warning::
https://www.googletagmanager.com/gtag/js?id=G-0FJ5...: 65 KB unused (41%)
Consider code splitting or tree shaking to reduce unused code.
Info::
Total unused JavaScript: 141 KB
141 KB unused JavaScript

Downloaded but never executed on this page.

ScriptSizeUnusedMinifiedParty
https://dukeupress.edu/dist/vendor.bundle.js?v=BHAkr3fLq_s1RU45elwo1yuc3mm_tTnq4mRrKInD5Pg87 KB75 KB (88%)1st
https://www.googletagmanager.com/gtag/js?id=G-0FJ5H8908M158 KB65 KB (41%)3rd
https://dukeupress.edu/dist/tabs-selector.bundle.js4 KB1st
https://dukeupress.edu/dist/embla-featured.bundle.js1 KB1st
https://dukeupress.edu/dist/utility-button-events.bundle.js3 KB1st
https://dukeupress.edu/dist/dropdown-toggle.bundle.js2 KB1st
https://dukeupress.edu/dist/mega-menu-toggle.bundle.js2 KB1st
https://dukeupress.edu/dist/header-height.bundle.js1 KB1st
https://dukeupress.edu/dist/nav-search.bundle.js2 KB1st
https://dukeupress.edu/dist/runtime.bundle.js?v=kwyclQQ-jUDqxgNHr21TfQ0BLbh-bdHWIy7K6W-T9Eo2 KB1st

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
Image Optimization
37 images, 0 KB saveable
PASS
37 images, 0 KB saveable
Info::
All images are well-optimized
37 images 585 KB
0 oversized -0 KB
2 legacy format
0 missing dimensions CLS risk
A+
Font Loading
4 fonts (349 KB)
PASS
4 fonts (349 KB)
Info::
4 font(s) use font-display: swap (FOUT risk but functional)

Web fonts

4

349 KB total

Render-blocking

0

of 4

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 FCP 3.3 s LCP 3.6 shttps://cdnjs.cloudflare.com/ajax/libs/font-awesome/6.7.2/webfonts/fa-solid-900.woff2fa-solid-900.woff2 https://cdnjs.cloudflare.com/ajax/libs/font-awesome/6.7.2/webfonts/fa-solid-900.woff2 — 155.2 KiB — 93 ms — font-display: swaphttps://fonts.gstatic.com/s/roboto/v51/KFO7CnqEu92Fr1ME7kSn66aGLdTylUAMa3yUBHMdazQ.woff2KFO7CnqEu92Fr1ME7kSn66a... https://fonts.gstatic.com/s/roboto/v51/KFO7CnqEu92Fr1ME7kSn66aGLdTylUAMa3yUBHMdazQ.woff2 — 36.7 KiB — 66 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 — 66 ms — font-display: swaphttps://cdnjs.cloudflare.com/ajax/libs/font-awesome/6.7.2/webfonts/fa-brands-400.woff2fa-brands-400.woff2 https://cdnjs.cloudflare.com/ajax/libs/font-awesome/6.7.2/webfonts/fa-brands-400.woff2 — 116.5 KiB — 40 ms — font-display: swap
fa-solid-900.woff2 woff2 swap
Size 155 KB
Load time 93 ms
Start 640 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
KFO7CnqEu92Fr1ME7kSn66a... woff2 swap
Size 37 KB
Load time 66 ms
Start 659 ms
Risk FOUT — text flashes from fallback to web font
KFO5CnqEu92Fr1Mu53ZEC9_... woff2 swap
Size 41 KB
Load time 66 ms
Start 659 ms
Risk FOUT — text flashes from fallback to web font
fa-brands-400.woff2 woff2 swap
Size 117 KB
Load time 40 ms
Start 742 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 ~136 KB and ~272 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
2 hints, 0 missing preconnects
PASS
2 hints, 0 missing preconnects
Info::
Page uses 2 resource hint(s)

Current Resource Hints

preconnect
2
preload
dns-prefetch
prefetch

2 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
59 requests over 1473ms
INFO
0 ms 1.0 s 2.0 s 3.0 s FCP 3.3 s LCP 3.6 shttps://dukeupress.edu// https://dukeupress.edu/ — 200 — 226.9 KiB — 701 ms — http/1.1https://cdnjs.cloudflare.com/ajax/libs/font-awesome/6.7.2/css/all.min.csscdnjs.cloudflare.com/ajax/libs/font... https://cdnjs.cloudflare.com/ajax/libs/font-awesome/6.7.2/css/all.min.css — 200 — 18.4 KiB — 97 ms — h3https://fonts.googleapis.com/css2?family=Roboto:ital,wght@0,400;0,500;0,700;1,400;1,500;1,700&display=swapfonts.googleapis.com/css2?family=Ro... https://fonts.googleapis.com/css2?family=Roboto:ital,wght@0,400;0,500;0,700;1,400;1,500;1,700&display=swap — 200 — 2.5 KiB — 119 ms — h2https://fonts.googleapis.com/css2?family=Roboto+Condensed:ital,wght@0,400;0,500;0,700;1,400;1,500;1,700&display=swapfonts.googleapis.com/css2?family=Ro... https://fonts.googleapis.com/css2?family=Roboto+Condensed:ital,wght@0,400;0,500;0,700;1,400;1,500;1,700&display=swap — 200 — 1003 B — 119 ms — h2https://www.googletagmanager.com/gtag/js?id=G-0FJ5H8908Mwww.googletagmanager.com/gtag/js?id... https://www.googletagmanager.com/gtag/js?id=G-0FJ5H8908M — 200 — 158.5 KiB — 216 ms — h2https://assets-us-01.kc-usercontent.com/f7ca9afb-82c2-002a-a423-84e111d5b498/6b1f4291-dddb-462d-9209-1b1fb8323113/dup-logo.pngassets-us-01.kc-usercontent.com/f7c... https://assets-us-01.kc-usercontent.com/f7ca9afb-82c2-002a-a423-84e111d5b498/6b1f4291-dddb-462d-9209-1b1fb8323113/dup-logo.png — 200 — 2.9 KiB — 45 ms — h2https://assets-us-01.kc-usercontent.com/f7ca9afb-82c2-002a-a423-84e111d5b498/bcc4d640-71df-4a59-9486-f806e2ede623/hero-slider-blue-background.jpg?fm=webp&auto=formatassets-us-01.kc-usercontent.com/f7c... https://assets-us-01.kc-usercontent.com/f7ca9afb-82c2-002a-a423-84e111d5b498/bcc4d640-71df-4a59-9486-f806e2ede623/hero-slider-blue-background.jpg?fm=webp&auto=format — 200 — 2.4 KiB — 6 ms — h2https://assets-us-01.kc-usercontent.com/f7ca9afb-82c2-002a-a423-84e111d5b498/59a14639-7be3-4af7-931c-2951ccd27bdf/978-1-4780-3331-8_pr.jpg?fm=webp&auto=formatassets-us-01.kc-usercontent.com/f7c... https://assets-us-01.kc-usercontent.com/f7ca9afb-82c2-002a-a423-84e111d5b498/59a14639-7be3-4af7-931c-2951ccd27bdf/978-1-4780-3331-8_pr.jpg?fm=webp&auto=format — 200 — 64.4 KiB — 21 ms — h2https://assets-us-01.kc-usercontent.com/f7ca9afb-82c2-002a-a423-84e111d5b498/cbd96f0a-b6a7-4bfc-ac44-b0d3c93b70d1/978-1-4780-3860-3_pr.jpg?fm=webp&auto=format&w=320&h=480&fit=clipassets-us-01.kc-usercontent.com/f7c... https://assets-us-01.kc-usercontent.com/f7ca9afb-82c2-002a-a423-84e111d5b498/cbd96f0a-b6a7-4bfc-ac44-b0d3c93b70d1/978-1-4780-3860-3_pr.jpg?fm=webp&auto=format&w=320&h=480&fit=clip — 200 — 39.1 KiB — 18 ms — h2https://assets-us-01.kc-usercontent.com/f7ca9afb-82c2-002a-a423-84e111d5b498/3dd82dd9-0690-4ba5-bba9-4928a05056b7/978-1-4780-3318-9_pr.jpg?fm=webp&auto=format&w=320&h=480&fit=clipassets-us-01.kc-usercontent.com/f7c... https://assets-us-01.kc-usercontent.com/f7ca9afb-82c2-002a-a423-84e111d5b498/3dd82dd9-0690-4ba5-bba9-4928a05056b7/978-1-4780-3318-9_pr.jpg?fm=webp&auto=format&w=320&h=480&fit=clip — 200 — 25.1 KiB — 8 ms — h2https://assets-us-01.kc-usercontent.com/f7ca9afb-82c2-002a-a423-84e111d5b498/39cb0fab-82fd-49c1-aa99-076c35b0552b/978-1-4780-3324-0_pr.jpg?fm=webp&auto=format&w=320&h=480&fit=clipassets-us-01.kc-usercontent.com/f7c... https://assets-us-01.kc-usercontent.com/f7ca9afb-82c2-002a-a423-84e111d5b498/39cb0fab-82fd-49c1-aa99-076c35b0552b/978-1-4780-3324-0_pr.jpg?fm=webp&auto=format&w=320&h=480&fit=clip — 200 — 14.8 KiB — 15 ms — h2https://assets-us-01.kc-usercontent.com/f7ca9afb-82c2-002a-a423-84e111d5b498/396adfa2-207d-43a3-9111-131e755228c0/978-1-4780-3330-1_pr.jpg?fm=webp&auto=format&w=320&h=480&fit=clipassets-us-01.kc-usercontent.com/f7c... https://assets-us-01.kc-usercontent.com/f7ca9afb-82c2-002a-a423-84e111d5b498/396adfa2-207d-43a3-9111-131e755228c0/978-1-4780-3330-1_pr.jpg?fm=webp&auto=format&w=320&h=480&fit=clip — 200 — 25.4 KiB — 13 ms — h2https://assets-us-01.kc-usercontent.com/f7ca9afb-82c2-002a-a423-84e111d5b498/cb932acf-f3bf-47f5-ad2a-5377017f8903/978-1-4780-3325-7_pr.jpg?fm=webp&auto=format&w=320&h=480&fit=clipassets-us-01.kc-usercontent.com/f7c... https://assets-us-01.kc-usercontent.com/f7ca9afb-82c2-002a-a423-84e111d5b498/cb932acf-f3bf-47f5-ad2a-5377017f8903/978-1-4780-3325-7_pr.jpg?fm=webp&auto=format&w=320&h=480&fit=clip — 200 — 43.5 KiB — 17 ms — h3https://assets-us-01.kc-usercontent.com/f7ca9afb-82c2-002a-a423-84e111d5b498/b6c9caad-483d-4e7d-8708-6a0f509659ac/TSQ_12_4_pr.jpg?fm=webp&auto=format&w=320&h=480&fit=clipassets-us-01.kc-usercontent.com/f7c... https://assets-us-01.kc-usercontent.com/f7ca9afb-82c2-002a-a423-84e111d5b498/b6c9caad-483d-4e7d-8708-6a0f509659ac/TSQ_12_4_pr.jpg?fm=webp&auto=format&w=320&h=480&fit=clip — 200 — 33.1 KiB — 17 ms — h3https://assets-us-01.kc-usercontent.com/f7ca9afb-82c2-002a-a423-84e111d5b498/a8b74883-bdcd-4a61-9812-43ce0338dec7/GLQ_32_1_pr.jpg?fm=webp&auto=format&w=320&h=480&fit=clipassets-us-01.kc-usercontent.com/f7c... https://assets-us-01.kc-usercontent.com/f7ca9afb-82c2-002a-a423-84e111d5b498/a8b74883-bdcd-4a61-9812-43ce0338dec7/GLQ_32_1_pr.jpg?fm=webp&auto=format&w=320&h=480&fit=clip — 200 — 13.1 KiB — 15 ms — h3https://assets-us-01.kc-usercontent.com/f7ca9afb-82c2-002a-a423-84e111d5b498/5f738c4b-bedf-47a9-af08-d6608249d969/978-1-4780-3334-9_pr.jpg?fm=webp&auto=format&w=320&h=480&fit=clipassets-us-01.kc-usercontent.com/f7c... https://assets-us-01.kc-usercontent.com/f7ca9afb-82c2-002a-a423-84e111d5b498/5f738c4b-bedf-47a9-af08-d6608249d969/978-1-4780-3334-9_pr.jpg?fm=webp&auto=format&w=320&h=480&fit=clip — 200 — 18.9 KiB — 17 ms — h3https://cdnjs.cloudflare.com/ajax/libs/font-awesome/6.7.2/webfonts/fa-solid-900.woff2cdnjs.cloudflare.com/ajax/libs/font... https://cdnjs.cloudflare.com/ajax/libs/font-awesome/6.7.2/webfonts/fa-solid-900.woff2 — 200 — 155.2 KiB — 93 ms — h3https://fonts.gstatic.com/s/roboto/v51/KFO7CnqEu92Fr1ME7kSn66aGLdTylUAMa3yUBHMdazQ.woff2fonts.gstatic.com/s/roboto/v51/KFO7... https://fonts.gstatic.com/s/roboto/v51/KFO7CnqEu92Fr1ME7kSn66aGLdTylUAMa3yUBHMdazQ.woff2 — 200 — 36.7 KiB — 66 ms — h3https://fonts.gstatic.com/s/roboto/v51/KFO5CnqEu92Fr1Mu53ZEC9_Vu3r1gIhOszmkBnkaSTbQWg.woff2fonts.gstatic.com/s/roboto/v51/KFO5... https://fonts.gstatic.com/s/roboto/v51/KFO5CnqEu92Fr1Mu53ZEC9_Vu3r1gIhOszmkBnkaSTbQWg.woff2 — 200 — 40.8 KiB — 66 ms — h3https://assets-us-01.kc-usercontent.com/f7ca9afb-82c2-002a-a423-84e111d5b498/1817e5e5-ba21-4066-9480-6a34efd3cd57/978-1-4780-1925-1_pr.jpg?fm=webp&auto=format&w=320&h=480&fit=clipassets-us-01.kc-usercontent.com/f7c... https://assets-us-01.kc-usercontent.com/f7ca9afb-82c2-002a-a423-84e111d5b498/1817e5e5-ba21-4066-9480-6a34efd3cd57/978-1-4780-1925-1_pr.jpg?fm=webp&auto=format&w=320&h=480&fit=clip — 200 — 52.9 KiB — 25 ms — h3https://assets-us-01.kc-usercontent.com/f7ca9afb-82c2-002a-a423-84e111d5b498/6d9c7eb2-f1f3-46c6-af6d-aadf911ac9ba/978-0-8223-6294-4_pr.jpg?fm=webp&auto=format&w=320&h=480&fit=clipassets-us-01.kc-usercontent.com/f7c... https://assets-us-01.kc-usercontent.com/f7ca9afb-82c2-002a-a423-84e111d5b498/6d9c7eb2-f1f3-46c6-af6d-aadf911ac9ba/978-0-8223-6294-4_pr.jpg?fm=webp&auto=format&w=320&h=480&fit=clip — 200 — 38.6 KiB — 5 ms — h3https://assets-us-01.kc-usercontent.com/f7ca9afb-82c2-002a-a423-84e111d5b498/43b48389-2627-49ed-913a-1f84e803528b/978-1-4780-2500-9_pr.jpg?fm=webp&auto=format&w=320&h=480&fit=clipassets-us-01.kc-usercontent.com/f7c... https://assets-us-01.kc-usercontent.com/f7ca9afb-82c2-002a-a423-84e111d5b498/43b48389-2627-49ed-913a-1f84e803528b/978-1-4780-2500-9_pr.jpg?fm=webp&auto=format&w=320&h=480&fit=clip — 200 — 12.9 KiB — 26 ms — h3https://assets-us-01.kc-usercontent.com/f7ca9afb-82c2-002a-a423-84e111d5b498/655dae9d-d88f-4e79-a641-073aa1fa9fa6/978-1-4780-1938-1_pr.jpg?fm=webp&auto=format&w=320&h=480&fit=clipassets-us-01.kc-usercontent.com/f7c... https://assets-us-01.kc-usercontent.com/f7ca9afb-82c2-002a-a423-84e111d5b498/655dae9d-d88f-4e79-a641-073aa1fa9fa6/978-1-4780-1938-1_pr.jpg?fm=webp&auto=format&w=320&h=480&fit=clip — 200 — 10.0 KiB — 43 ms — h3https://assets-us-01.kc-usercontent.com/f7ca9afb-82c2-002a-a423-84e111d5b498/ba403599-9d51-4720-bf24-9fb94a31680c/978-0-8223-6319-4_pr.jpg?fm=webp&auto=format&w=320&h=480&fit=clipassets-us-01.kc-usercontent.com/f7c... https://assets-us-01.kc-usercontent.com/f7ca9afb-82c2-002a-a423-84e111d5b498/ba403599-9d51-4720-bf24-9fb94a31680c/978-0-8223-6319-4_pr.jpg?fm=webp&auto=format&w=320&h=480&fit=clip — 200 — 16.6 KiB — 25 ms — h3https://assets-us-01.kc-usercontent.com/f7ca9afb-82c2-002a-a423-84e111d5b498/c9e2a7d5-30bd-4ee2-b905-9fc3aee8ca85/FSR_new_pr.jpg?fm=webp&auto=format&w=320&h=480&fit=clipassets-us-01.kc-usercontent.com/f7c... 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h3https://assets-us-01.kc-usercontent.com/f7ca9afb-82c2-002a-a423-84e111d5b498/5a54f992-f669-49dc-81d4-66810aad102b/IJM_new_pr.jpg?fm=webp&auto=format&w=320&h=480&fit=clipassets-us-01.kc-usercontent.com/f7c... https://assets-us-01.kc-usercontent.com/f7ca9afb-82c2-002a-a423-84e111d5b498/5a54f992-f669-49dc-81d4-66810aad102b/IJM_new_pr.jpg?fm=webp&auto=format&w=320&h=480&fit=clip — 200 — 10.6 KiB — 41 ms — h3
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h2https://assets-us-01.kc-usercontent.com/f7ca9afb-82c2-002a-a423-84e111d5b498/3dd82dd9-0690-4ba5-bba9-4928a05056b7/978-1-4780-3318-9_pr.jpg?fm=webp&auto=format&w=320&h=480&fit=clipassets-us-01.kc-usercontent.com/f7c... https://assets-us-01.kc-usercontent.com/f7ca9afb-82c2-002a-a423-84e111d5b498/3dd82dd9-0690-4ba5-bba9-4928a05056b7/978-1-4780-3318-9_pr.jpg?fm=webp&auto=format&w=320&h=480&fit=clip — 200 — 25.1 KiB — 8 ms — h2https://assets-us-01.kc-usercontent.com/f7ca9afb-82c2-002a-a423-84e111d5b498/39cb0fab-82fd-49c1-aa99-076c35b0552b/978-1-4780-3324-0_pr.jpg?fm=webp&auto=format&w=320&h=480&fit=clipassets-us-01.kc-usercontent.com/f7c... https://assets-us-01.kc-usercontent.com/f7ca9afb-82c2-002a-a423-84e111d5b498/39cb0fab-82fd-49c1-aa99-076c35b0552b/978-1-4780-3324-0_pr.jpg?fm=webp&auto=format&w=320&h=480&fit=clip — 200 — 14.8 KiB — 15 ms — h2https://assets-us-01.kc-usercontent.com/f7ca9afb-82c2-002a-a423-84e111d5b498/396adfa2-207d-43a3-9111-131e755228c0/978-1-4780-3330-1_pr.jpg?fm=webp&auto=format&w=320&h=480&fit=clipassets-us-01.kc-usercontent.com/f7c... https://assets-us-01.kc-usercontent.com/f7ca9afb-82c2-002a-a423-84e111d5b498/396adfa2-207d-43a3-9111-131e755228c0/978-1-4780-3330-1_pr.jpg?fm=webp&auto=format&w=320&h=480&fit=clip — 200 — 25.4 KiB — 13 ms — h2https://assets-us-01.kc-usercontent.com/f7ca9afb-82c2-002a-a423-84e111d5b498/cb932acf-f3bf-47f5-ad2a-5377017f8903/978-1-4780-3325-7_pr.jpg?fm=webp&auto=format&w=320&h=480&fit=clipassets-us-01.kc-usercontent.com/f7c... https://assets-us-01.kc-usercontent.com/f7ca9afb-82c2-002a-a423-84e111d5b498/cb932acf-f3bf-47f5-ad2a-5377017f8903/978-1-4780-3325-7_pr.jpg?fm=webp&auto=format&w=320&h=480&fit=clip — 200 — 43.5 KiB — 17 ms — h3https://assets-us-01.kc-usercontent.com/f7ca9afb-82c2-002a-a423-84e111d5b498/b6c9caad-483d-4e7d-8708-6a0f509659ac/TSQ_12_4_pr.jpg?fm=webp&auto=format&w=320&h=480&fit=clipassets-us-01.kc-usercontent.com/f7c... https://assets-us-01.kc-usercontent.com/f7ca9afb-82c2-002a-a423-84e111d5b498/b6c9caad-483d-4e7d-8708-6a0f509659ac/TSQ_12_4_pr.jpg?fm=webp&auto=format&w=320&h=480&fit=clip — 200 — 33.1 KiB — 17 ms — h3https://assets-us-01.kc-usercontent.com/f7ca9afb-82c2-002a-a423-84e111d5b498/a8b74883-bdcd-4a61-9812-43ce0338dec7/GLQ_32_1_pr.jpg?fm=webp&auto=format&w=320&h=480&fit=clipassets-us-01.kc-usercontent.com/f7c... https://assets-us-01.kc-usercontent.com/f7ca9afb-82c2-002a-a423-84e111d5b498/a8b74883-bdcd-4a61-9812-43ce0338dec7/GLQ_32_1_pr.jpg?fm=webp&auto=format&w=320&h=480&fit=clip — 200 — 13.1 KiB — 15 ms — h3https://assets-us-01.kc-usercontent.com/f7ca9afb-82c2-002a-a423-84e111d5b498/5f738c4b-bedf-47a9-af08-d6608249d969/978-1-4780-3334-9_pr.jpg?fm=webp&auto=format&w=320&h=480&fit=clipassets-us-01.kc-usercontent.com/f7c... https://assets-us-01.kc-usercontent.com/f7ca9afb-82c2-002a-a423-84e111d5b498/5f738c4b-bedf-47a9-af08-d6608249d969/978-1-4780-3334-9_pr.jpg?fm=webp&auto=format&w=320&h=480&fit=clip — 200 — 18.9 KiB — 17 ms — h3https://cdnjs.cloudflare.com/ajax/libs/font-awesome/6.7.2/webfonts/fa-solid-900.woff2cdnjs.cloudflare.com/ajax/libs/font... https://cdnjs.cloudflare.com/ajax/libs/font-awesome/6.7.2/webfonts/fa-solid-900.woff2 — 200 — 155.2 KiB — 93 ms — h3https://fonts.gstatic.com/s/roboto/v51/KFO7CnqEu92Fr1ME7kSn66aGLdTylUAMa3yUBHMdazQ.woff2fonts.gstatic.com/s/roboto/v51/KFO7... https://fonts.gstatic.com/s/roboto/v51/KFO7CnqEu92Fr1ME7kSn66aGLdTylUAMa3yUBHMdazQ.woff2 — 200 — 36.7 KiB — 66 ms — 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https://assets-us-01.kc-usercontent.com/f7ca9afb-82c2-002a-a423-84e111d5b498/6d9c7eb2-f1f3-46c6-af6d-aadf911ac9ba/978-0-8223-6294-4_pr.jpg?fm=webp&auto=format&w=320&h=480&fit=clip — 200 — 38.6 KiB — 5 ms — h3https://assets-us-01.kc-usercontent.com/f7ca9afb-82c2-002a-a423-84e111d5b498/43b48389-2627-49ed-913a-1f84e803528b/978-1-4780-2500-9_pr.jpg?fm=webp&auto=format&w=320&h=480&fit=clipassets-us-01.kc-usercontent.com/f7c... https://assets-us-01.kc-usercontent.com/f7ca9afb-82c2-002a-a423-84e111d5b498/43b48389-2627-49ed-913a-1f84e803528b/978-1-4780-2500-9_pr.jpg?fm=webp&auto=format&w=320&h=480&fit=clip — 200 — 12.9 KiB — 26 ms — h3https://assets-us-01.kc-usercontent.com/f7ca9afb-82c2-002a-a423-84e111d5b498/655dae9d-d88f-4e79-a641-073aa1fa9fa6/978-1-4780-1938-1_pr.jpg?fm=webp&auto=format&w=320&h=480&fit=clipassets-us-01.kc-usercontent.com/f7c... https://assets-us-01.kc-usercontent.com/f7ca9afb-82c2-002a-a423-84e111d5b498/655dae9d-d88f-4e79-a641-073aa1fa9fa6/978-1-4780-1938-1_pr.jpg?fm=webp&auto=format&w=320&h=480&fit=clip — 200 — 10.0 KiB — 43 ms — h3https://assets-us-01.kc-usercontent.com/f7ca9afb-82c2-002a-a423-84e111d5b498/ba403599-9d51-4720-bf24-9fb94a31680c/978-0-8223-6319-4_pr.jpg?fm=webp&auto=format&w=320&h=480&fit=clipassets-us-01.kc-usercontent.com/f7c... https://assets-us-01.kc-usercontent.com/f7ca9afb-82c2-002a-a423-84e111d5b498/ba403599-9d51-4720-bf24-9fb94a31680c/978-0-8223-6319-4_pr.jpg?fm=webp&auto=format&w=320&h=480&fit=clip — 200 — 16.6 KiB — 25 ms — h3https://assets-us-01.kc-usercontent.com/f7ca9afb-82c2-002a-a423-84e111d5b498/c9e2a7d5-30bd-4ee2-b905-9fc3aee8ca85/FSR_new_pr.jpg?fm=webp&auto=format&w=320&h=480&fit=clipassets-us-01.kc-usercontent.com/f7c... https://assets-us-01.kc-usercontent.com/f7ca9afb-82c2-002a-a423-84e111d5b498/c9e2a7d5-30bd-4ee2-b905-9fc3aee8ca85/FSR_new_pr.jpg?fm=webp&auto=format&w=320&h=480&fit=clip — 200 — 7.7 KiB — 26 ms — h3https://assets-us-01.kc-usercontent.com/f7ca9afb-82c2-002a-a423-84e111d5b498/b41a0be1-624a-4769-b431-c253d1925132/NPS_new_pr.jpg?fm=webp&auto=format&w=320&h=480&fit=clipassets-us-01.kc-usercontent.com/f7c... https://assets-us-01.kc-usercontent.com/f7ca9afb-82c2-002a-a423-84e111d5b498/b41a0be1-624a-4769-b431-c253d1925132/NPS_new_pr.jpg?fm=webp&auto=format&w=320&h=480&fit=clip — 200 — 11.3 KiB — 42 ms — h3https://assets-us-01.kc-usercontent.com/f7ca9afb-82c2-002a-a423-84e111d5b498/179ff1ff-a62e-4a69-bc85-cfc2b28c50d7/JAS_new_pr.jpg?fm=webp&auto=format&w=320&h=480&fit=clipassets-us-01.kc-usercontent.com/f7c... https://assets-us-01.kc-usercontent.com/f7ca9afb-82c2-002a-a423-84e111d5b498/179ff1ff-a62e-4a69-bc85-cfc2b28c50d7/JAS_new_pr.jpg?fm=webp&auto=format&w=320&h=480&fit=clip — 200 — 21.8 KiB 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h3https://assets-us-01.kc-usercontent.com/f7ca9afb-82c2-002a-a423-84e111d5b498/5a54f992-f669-49dc-81d4-66810aad102b/IJM_new_pr.jpg?fm=webp&auto=format&w=320&h=480&fit=clipassets-us-01.kc-usercontent.com/f7c... https://assets-us-01.kc-usercontent.com/f7ca9afb-82c2-002a-a423-84e111d5b498/5a54f992-f669-49dc-81d4-66810aad102b/IJM_new_pr.jpg?fm=webp&auto=format&w=320&h=480&fit=clip — 200 — 10.6 KiB — 41 ms — h3https://assets-us-01.kc-usercontent.com/f7ca9afb-82c2-002a-a423-84e111d5b498/da07afa8-d9eb-4e79-ae26-c390ec26f853/KJM_new_pr.jpg?fm=webp&auto=format&w=320&h=480&fit=clipassets-us-01.kc-usercontent.com/f7c... https://assets-us-01.kc-usercontent.com/f7ca9afb-82c2-002a-a423-84e111d5b498/da07afa8-d9eb-4e79-ae26-c390ec26f853/KJM_new_pr.jpg?fm=webp&auto=format&w=320&h=480&fit=clip — 200 — 5.2 KiB — 35 ms — 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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
49% of JavaScript execution is third-party
First-party Third-party 465ms · 158KB · €2/mo
Unattributable
Other
Costly
Execution 236ms
Transfer 0 KB
Monthly Cost €1/mo
Google Tag Manager
Tag Manager
Costly
Execution 229ms
Transfer 158 KB
Unused 41%
Monthly Cost €1/mo

These scripts may cost more than they're worth

  • Unattributable adds 236ms and costs ~€1/month
  • Google Tag Manager adds 229ms and costs ~€1/month

49% of JavaScript execution time comes from third-party scripts.

Why this matters

Third-party scripts (analytics, ads, social, A/B testing) often dominate execution time — every one is a perf-and-privacy tax.

Learn more

Each third-party script is a black box: you don't control when it loads, what it executes, or how much it grows. They often account for a major share of total blocking time on average sites (HTTP Archive's Web Almanac documents the trend). Audit which ones you actually need, defer the rest, and use facade patterns (lite-youtube, lite-vimeo) for embedded media.

Source: web.dev / HTTP Archive Web Almanac

Unattributable takes 236ms 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 229ms 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

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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