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https://doi.org

Performance

· 17 checks — Lighthouse + waterfall + sustainability rolled into one auditable list.
SCORE
86
GRADE
B
FIX
1
REVIEW
4
PASS
10
INFO
2

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

Mobile Desktop
62
Performance Overall performance score (0–100) based on Core Web Vitals and other metrics. 90+ is good.
73
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.
75
SEO Measures basic SEO optimizations: meta tags, crawlability, link text, and mobile friendliness.

First Contentful Paint First Contentful Paint — how long until the browser renders the first piece of content. Under 1.8s is good.

5.45 s

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

7.77 s

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

6 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.

5.45 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.

7.77 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
10 PASS 4 REVIEW 1 FIX
D
Third-Party Impact
Action
99% third-party, 0 ms blocking
FIX
99% third-party, 0 ms blocking
Warning::
Third-party code accounts for 99% of page weight (928.3 KiB of 935.1 KiB)
Info::
Third-party blocking time is low (0 ms)
99%
First-party Third-party
C
Image Optimization
Action
6 images, 0 KB saveable
REVIEW
6 images, 0 KB saveable
Warning::
https://www.doi.org/images/logos/footer_logo_cropp... is missing width/height — may cause layout shift
Set explicit width and height to prevent CLS.
Warning::
https://www.doi.org/images/logos/header_logo_cropp... is missing width/height — may cause layout shift
Set explicit width and height to prevent CLS.
Warning::
https://www.doi.org/images/globe.svg is missing width/height — may cause layout shift
Set explicit width and height to prevent CLS.
Warning::
https://www.doi.org/images/target.svg is missing width/height — may cause layout shift
Set explicit width and height to prevent CLS.
Warning::
https://www.doi.org/images/communities/DOI%20Logo%... is missing width/height — may cause layout shift
Set explicit width and height to prevent CLS.
6 images 88 KB
0 oversized -0 KB
6 legacy format
5 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

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

B
JS Execution Cost
734ms total JS execution
REVIEW
734ms total JS execution
Warning::
Unattributable: 333ms CPU time
Info::
https://www.doi.org/: 222ms CPU time
Info::
https://ajax.googleapis.com/ajax/libs/jquery/3.6.1...: 67ms CPU time
Info::
https://www.gstatic.com/charts/51/js/jsapi_compile...: 56ms CPU time
Info::
https://www.gstatic.com/charts/51/js/jsapi_compile...: 55ms CPU time
Warning::
Third-party scripts: 734ms (100% of total)

Main Thread Breakdown

Other 35% Script Evaluation 25% Style & Layout 21% Script Parsing & Compilation 13% Parse HTML & CSS 4%
ScriptTotalScriptingParse/CompileParty
Unattributable333ms22ms0ms3rd
https://www.doi.org/222ms25ms3ms3rd
https://ajax.googleapis.com/ajax/libs/jquery/3.6.1/jquery.min.js67ms57ms6ms3rd
https://www.gstatic.com/charts/51/js/jsapi_compiled_ui_module.js56ms13ms43ms3rd
https://www.gstatic.com/charts/51/js/jsapi_compiled_default_module.js55ms26ms29ms3rd
C
JS Bundles
Action
16 scripts, 251 KB unused
REVIEW
16 scripts, 251 KB unused
Warning::
https://www.gstatic.com/charts/51/js/jsapi_compile...: 149 KB unused (89%)
Consider code splitting or tree shaking to reduce unused code.
Warning::
https://www.gstatic.com/charts/51/js/jsapi_compile...: 58 KB unused (71%)
Consider code splitting or tree shaking to reduce unused code.
Warning::
https://www.gstatic.com/charts/51/js/jsapi_compile...: 22 KB unused (89%)
Consider code splitting or tree shaking to reduce unused code.
Warning::
https://ajax.googleapis.com/ajax/libs/jquery/3.6.1...: 22 KB unused (72%)
Consider code splitting or tree shaking to reduce unused code.
Info::
Total unused JavaScript: 251 KB
251 KB unused JavaScript

Downloaded but never executed on this page.

ScriptSizeUnusedMinifiedParty
https://www.gstatic.com/charts/51/js/jsapi_compiled_ui_module.js167 KB149 KB (89%)✓3rd
https://www.gstatic.com/charts/51/js/jsapi_compiled_default_module.js83 KB58 KB (71%)✓3rd
https://www.gstatic.com/charts/51/js/jsapi_compiled_fw_module.js25 KB22 KB (89%)✓3rd
https://ajax.googleapis.com/ajax/libs/jquery/3.6.1/jquery.min.js31 KB22 KB (72%)✓3rd
https://www.gstatic.com/charts/51/js/jsapi_compiled_corechart_module.js1 KB—✓3rd
https://www.gstatic.com/charts/51/loader.js16 KB—✓3rd
https://www.gstatic.com/charts/51/js/jsapi_compiled_graphics_module.js8 KB—✓3rd
https://www.doi.org/js/script.js3 KB—✓3rd
https://cdn.jsdelivr.net/npm/bootstrap@5.0.2/dist/js/bootstrap.bundle.min.js23 KB—✓3rd
https://www.gstatic.com/charts/loader.js19 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

B
Page Weight Inventory
41 resources · 935 KB · 251 KB savings available
REVIEW
41 resources · 935 KB · 251 KB savings available
Info::
Within 1MB page-weight target
Got: 935 KB
Info::
~251 KB of savings available
Warning::
39 third-party resources (99% of weight)
41 resources · 935.1 KiB · 39 third-party Within 1MB page-weight target
JavaScript 44% · 407.5 KiB
Font 39% · 361.8 KiB
Image 10% · 89.9 KiB
CSS 7% · 61.6 KiB
Document 1% · 7.5 KiB
Other 1% · 6.7 KiB

~251.4 KiB of savings available

Remove unused JavaScript: 251.4 KiB
A
Page Weight Budget
935 KB transferred, 41 requests
PASS
935 KB transferred, 41 requests
Info::
Page weighs 2.4 MB (935 KB transferred)
Info::
Fonts are 362 KB — consider subsetting or using system fonts
Subset fonts to include only used characters, or switch to system font stacks.
Got: 362 KB
Info::
41 HTTP requests
Info::
Estimated 0.19 g CO2 per page load
935 KB / 2.4 MB budget
935 KB transferred
41 requests
0.19 g CO2 per page load
JavaScript 407.5 KiB 44%
Fonts 361.8 KiB 39%
Images 87.9 KiB 9%
CSS 61.6 KiB 7%
HTML 7.5 KiB 1%
Other 6.2 KiB 1%
Other 2.5 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

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
4 fonts (362 KB)
PASS
4 fonts (362 KB)
Info::
4 font(s) use font-display: swap (FOUT risk but functional)

Web fonts

4

362 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 4.0 s 5.0 s 6.0 s 7.0 s 8.0 s FCP 5.4 s LCP 7.8 shttps://use.typekit.net/af/9b05f3/000000000000000000013365/27/l?primer=7cdcb44be4a7db8877ffa5c0007b8dd865b3bbc383831fe2ea177f62257a9191&fvd=n4&v=3l https://use.typekit.net/af/9b05f3/000000000000000000013365/27/l?primer=7cdcb44be4a7db8877ffa5c0007b8dd865b3bbc383831fe2ea177f62257a9191&fvd=n4&v=3 — 50.6 KiB — 12 ms — font-display: swaphttps://use.typekit.net/af/053fc9/00000000000000003b9af1e4/27/l?primer=7cdcb44be4a7db8877ffa5c0007b8dd865b3bbc383831fe2ea177f62257a9191&fvd=n7&v=3l https://use.typekit.net/af/053fc9/00000000000000003b9af1e4/27/l?primer=7cdcb44be4a7db8877ffa5c0007b8dd865b3bbc383831fe2ea177f62257a9191&fvd=n7&v=3 — 39.8 KiB — 9 ms — font-display: swaphttps://www.doi.org/css/fontawesome-free-6.7.2-web/webfonts/fa-solid-900.woff2fa-solid-900.woff2 https://www.doi.org/css/fontawesome-free-6.7.2-web/webfonts/fa-solid-900.woff2 — 155.1 KiB — 60 ms — font-display: swaphttps://www.doi.org/css/fontawesome-free-6.7.2-web/webfonts/fa-brands-400.woff2fa-brands-400.woff2 https://www.doi.org/css/fontawesome-free-6.7.2-web/webfonts/fa-brands-400.woff2 — 116.4 KiB — 42 ms — font-display: swap
l woff2 swap
Size 51 KB
Load time 12 ms
Start 487 ms
Risk FOUT — text flashes from fallback to web font
l woff2 swap
Size 40 KB
Load time 9 ms
Start 491 ms
Risk FOUT — text flashes from fallback to web font
fa-solid-900.woff2 woff2 swap
Size 155 KB
Load time 60 ms
Start 491 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
fa-brands-400.woff2 woff2 swap
Size 116 KB
Load time 42 ms
Start 491 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
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
A+
Green Hosting
Whether the site is served from green-energy infrastructure
PASS

Green Hosting

This site is hosted on green energy infrastructure

Provider: Cloudflare

A
HTTP Caching
max-age=14400 (4 hours)
PASS
max-age=14400 (4 hours)
Info::
Cache-Control header is set
Got: max-age=14400
Info::
Effective TTL: 4 hours (max-age=14400)
Info::
No ETag or Last-Modified header
Conditional requests (304 Not Modified) are not possible without validators.
Cache-Control

max-age=14400

DirectiveValueMeaning
max-age14400Cache for 4 hours
Effective TTL: 14400 seconds
Network Waterfall
41 requests over 610ms
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 5.4 s LCP 7.8 shttps://doi.org// https://doi.org/ — 301 — 506 B — 71 ms — h2https://www.doi.org/www.doi.org/ https://www.doi.org/ — 200 — 7.5 KiB — 65 ms — h2https://cdn.jsdelivr.net/npm/bootstrap@5.0.2/dist/css/bootstrap.min.csscdn.jsdelivr.net/npm/bootstrap@5.0.... https://cdn.jsdelivr.net/npm/bootstrap@5.0.2/dist/css/bootstrap.min.css — 200 — 25.2 KiB — 47 ms — h2https://cdn.jsdelivr.net/npm/bootstrap@5.0.2/dist/js/bootstrap.bundle.min.jscdn.jsdelivr.net/npm/bootstrap@5.0.... https://cdn.jsdelivr.net/npm/bootstrap@5.0.2/dist/js/bootstrap.bundle.min.js — 200 — 22.8 KiB — 48 ms — h2https://www.gstatic.com/charts/loader.jswww.gstatic.com/charts/loader.js https://www.gstatic.com/charts/loader.js — 200 — 18.6 KiB — 154 ms — h2https://ajax.googleapis.com/ajax/libs/jquery/3.6.1/jquery.min.jsajax.googleapis.com/ajax/libs/jquer... https://ajax.googleapis.com/ajax/libs/jquery/3.6.1/jquery.min.js — 200 — 31.0 KiB — 178 ms — h2https://www.doi.org/css/fontawesome-free-6.7.2-web/css/fontawesome.min.csswww.doi.org/css/fontawesome-free-6.... https://www.doi.org/css/fontawesome-free-6.7.2-web/css/fontawesome.min.css — 200 — 16.3 KiB — 37 ms — h2https://www.doi.org/css/fontawesome-free-6.7.2-web/css/solid.min.csswww.doi.org/css/fontawesome-free-6.... https://www.doi.org/css/fontawesome-free-6.7.2-web/css/solid.min.css — 200 — 778 B — 31 ms — h2https://www.doi.org/css/fontawesome-free-6.7.2-web/css/brands.min.csswww.doi.org/css/fontawesome-free-6.... https://www.doi.org/css/fontawesome-free-6.7.2-web/css/brands.min.css — 200 — 5.1 KiB — 33 ms — h2https://www.doi.org/css/style.396922656c054c5f43d96d61d78d931511d328beee57f2bb7e683671bc6537b8.css?v=sha256-OWkiZWwFTF9D2W1h142TFRHTKL7uV%2fK7fmg2cbxlN7g%3dwww.doi.org/css/style.396922656c054... https://www.doi.org/css/style.396922656c054c5f43d96d61d78d931511d328beee57f2bb7e683671bc6537b8.css?v=sha256-OWkiZWwFTF9D2W1h142TFRHTKL7uV%2fK7fmg2cbxlN7g%3d — 200 — 7.1 KiB — 34 ms — h2https://www.doi.org/images/logos/header_logo_cropped_registered.svgwww.doi.org/images/logos/header_log... https://www.doi.org/images/logos/header_logo_cropped_registered.svg — 200 — 2.4 KiB — 37 ms — h2https://www.doi.org/images/globe.svgwww.doi.org/images/globe.svg https://www.doi.org/images/globe.svg — 200 — 1.2 KiB — 38 ms — h2https://www.doi.org/images/target.svgwww.doi.org/images/target.svg https://www.doi.org/images/target.svg — 200 — 1.1 KiB — 21 ms — h2https://www.doi.org/images/communities/DOI%20Logo%20Icon-RGB.pngwww.doi.org/images/communities/DOI%... https://www.doi.org/images/communities/DOI%20Logo%20Icon-RGB.png — 200 — 34.6 KiB — 30 ms — h2https://www.doi.org/images/logos/footer_logo_cropped_registered.svgwww.doi.org/images/logos/footer_log... https://www.doi.org/images/logos/footer_logo_cropped_registered.svg — 200 — 2.9 KiB — 20 ms — h2https://www.doi.org/js/script.jswww.doi.org/js/script.js https://www.doi.org/js/script.js — 200 — 3.4 KiB — 21 ms — h2https://www.gstatic.com/charts/51/loader.jswww.gstatic.com/charts/51/loader.js https://www.gstatic.com/charts/51/loader.js — 200 — 15.6 KiB — 46 ms — h2https://use.typekit.net/gcr6xms.cssuse.typekit.net/gcr6xms.css https://use.typekit.net/gcr6xms.css — 200 — 921 B — 61 ms — h2https://www.gstatic.com/charts/51/css/core/tooltip.csswww.gstatic.com/charts/51/css/core/... https://www.gstatic.com/charts/51/css/core/tooltip.css — 200 — 560 B — 40 ms — h3https://www.gstatic.com/charts/51/css/util/util.csswww.gstatic.com/charts/51/css/util/... https://www.gstatic.com/charts/51/css/util/util.css — 200 — 3.2 KiB — 64 ms — h3https://www.gstatic.com/charts/51/css/table/table.csswww.gstatic.com/charts/51/css/table... https://www.gstatic.com/charts/51/css/table/table.css — 200 — 2.0 KiB — 67 ms — h3https://www.gstatic.com/charts/51/css/util/format.csswww.gstatic.com/charts/51/css/util/... https://www.gstatic.com/charts/51/css/util/format.css — 200 — 338 B — 52 ms — h3https://www.gstatic.com/charts/51/js/jsapi_compiled_default_module.jswww.gstatic.com/charts/51/js/jsapi_... https://www.gstatic.com/charts/51/js/jsapi_compiled_default_module.js — 200 — 82.6 KiB — 158 ms — h3https://www.gstatic.com/charts/51/js/jsapi_compiled_graphics_module.jswww.gstatic.com/charts/51/js/jsapi_... https://www.gstatic.com/charts/51/js/jsapi_compiled_graphics_module.js — 200 — 7.8 KiB — 96 ms — h3https://www.gstatic.com/charts/51/js/jsapi_compiled_ui_module.jswww.gstatic.com/charts/51/js/jsapi_... https://www.gstatic.com/charts/51/js/jsapi_compiled_ui_module.js — 200 — 167.1 KiB — 170 ms — h3https://www.gstatic.com/charts/51/js/jsapi_compiled_corechart_module.jswww.gstatic.com/charts/51/js/jsapi_... https://www.gstatic.com/charts/51/js/jsapi_compiled_corechart_module.js — 200 — 1.3 KiB — 74 ms — h3https://www.gstatic.com/charts/51/js/jsapi_compiled_fw_module.jswww.gstatic.com/charts/51/js/jsapi_... https://www.gstatic.com/charts/51/js/jsapi_compiled_fw_module.js — 200 — 25.2 KiB — 70 ms — h3https://www.gstatic.com/charts/51/third_party/dygraphs/dygraph-tickers-combined.jswww.gstatic.com/charts/51/third_par... https://www.gstatic.com/charts/51/third_party/dygraphs/dygraph-tickers-combined.js — 200 — 5.9 KiB — 103 ms — h3https://www.gstatic.com/charts/51/third_party/webfontloader/webfont.jswww.gstatic.com/charts/51/third_par... https://www.gstatic.com/charts/51/third_party/webfontloader/webfont.js — 200 — 6.5 KiB — 99 ms — h3https://www.gstatic.com/charts/51/js/jsapi_compiled_line_module.jswww.gstatic.com/charts/51/js/jsapi_... https://www.gstatic.com/charts/51/js/jsapi_compiled_line_module.js — 200 — 1.0 KiB — 122 ms — h3
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 5.4 s LCP 7.8 shttps://doi.org// https://doi.org/ — 301 — 506 B — 71 ms — h2https://www.doi.org/www.doi.org/ https://www.doi.org/ — 200 — 7.5 KiB — 65 ms — h2https://cdn.jsdelivr.net/npm/bootstrap@5.0.2/dist/css/bootstrap.min.csscdn.jsdelivr.net/npm/bootstrap@5.0.... https://cdn.jsdelivr.net/npm/bootstrap@5.0.2/dist/css/bootstrap.min.css — 200 — 25.2 KiB — 47 ms — h2https://cdn.jsdelivr.net/npm/bootstrap@5.0.2/dist/js/bootstrap.bundle.min.jscdn.jsdelivr.net/npm/bootstrap@5.0.... https://cdn.jsdelivr.net/npm/bootstrap@5.0.2/dist/js/bootstrap.bundle.min.js — 200 — 22.8 KiB — 48 ms — h2https://www.gstatic.com/charts/loader.jswww.gstatic.com/charts/loader.js https://www.gstatic.com/charts/loader.js — 200 — 18.6 KiB — 154 ms — h2https://ajax.googleapis.com/ajax/libs/jquery/3.6.1/jquery.min.jsajax.googleapis.com/ajax/libs/jquer... https://ajax.googleapis.com/ajax/libs/jquery/3.6.1/jquery.min.js — 200 — 31.0 KiB — 178 ms — h2https://www.doi.org/css/fontawesome-free-6.7.2-web/css/fontawesome.min.csswww.doi.org/css/fontawesome-free-6.... https://www.doi.org/css/fontawesome-free-6.7.2-web/css/fontawesome.min.css — 200 — 16.3 KiB — 37 ms — h2https://www.doi.org/css/fontawesome-free-6.7.2-web/css/solid.min.csswww.doi.org/css/fontawesome-free-6.... https://www.doi.org/css/fontawesome-free-6.7.2-web/css/solid.min.css — 200 — 778 B — 31 ms — h2https://www.doi.org/css/fontawesome-free-6.7.2-web/css/brands.min.csswww.doi.org/css/fontawesome-free-6.... https://www.doi.org/css/fontawesome-free-6.7.2-web/css/brands.min.css — 200 — 5.1 KiB — 33 ms — h2https://www.doi.org/css/style.396922656c054c5f43d96d61d78d931511d328beee57f2bb7e683671bc6537b8.css?v=sha256-OWkiZWwFTF9D2W1h142TFRHTKL7uV%2fK7fmg2cbxlN7g%3dwww.doi.org/css/style.396922656c054... https://www.doi.org/css/style.396922656c054c5f43d96d61d78d931511d328beee57f2bb7e683671bc6537b8.css?v=sha256-OWkiZWwFTF9D2W1h142TFRHTKL7uV%2fK7fmg2cbxlN7g%3d — 200 — 7.1 KiB — 34 ms — h2https://www.doi.org/images/logos/header_logo_cropped_registered.svgwww.doi.org/images/logos/header_log... https://www.doi.org/images/logos/header_logo_cropped_registered.svg — 200 — 2.4 KiB — 37 ms — h2https://www.doi.org/images/globe.svgwww.doi.org/images/globe.svg https://www.doi.org/images/globe.svg — 200 — 1.2 KiB — 38 ms — h2https://www.doi.org/images/target.svgwww.doi.org/images/target.svg https://www.doi.org/images/target.svg — 200 — 1.1 KiB — 21 ms — h2https://www.doi.org/images/communities/DOI%20Logo%20Icon-RGB.pngwww.doi.org/images/communities/DOI%... https://www.doi.org/images/communities/DOI%20Logo%20Icon-RGB.png — 200 — 34.6 KiB — 30 ms — h2https://www.doi.org/images/logos/footer_logo_cropped_registered.svgwww.doi.org/images/logos/footer_log... https://www.doi.org/images/logos/footer_logo_cropped_registered.svg — 200 — 2.9 KiB — 20 ms — h2https://www.doi.org/js/script.jswww.doi.org/js/script.js https://www.doi.org/js/script.js — 200 — 3.4 KiB — 21 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
100% of JavaScript execution is third-party
First-party Third-party 734ms · 288KB · $2/mo
Unattributable
Other
Costly
Execution 333ms
Transfer 0 KB
Monthly Cost $1/mo
www.doi.org
Other
Costly
Execution 222ms
Transfer 8 KB
Monthly Cost $1/mo
ajax.googleapis.com
Other
Optional
Execution 67ms
Transfer 31 KB
Unused 72%
Monthly Cost $0/mo
www.gstatic.com
Other
Optional
Execution 56ms
Transfer 167 KB
Unused 89%
Monthly Cost $0/mo
www.gstatic.com
Other
Optional
Execution 55ms
Transfer 83 KB
Unused 71%
Monthly Cost $0/mo

These scripts may cost more than they're worth

  • Unattributable adds 333ms and costs ~$1/month
  • www.doi.org adds 222ms and costs ~$1/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 333ms 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.doi.org takes 222ms of CPU time. Consider loading it asynchronously or replacing it with a lighter alternative.

Why this matters

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

Source: web.dev

72% of ajax.googleapis.com'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

89% of www.gstatic.com'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.gstatic.com'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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