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https://doi.org

Performance

· 15 checks — Lighthouse + waterfall + sustainability rolled into one auditable list.
SCORE
86
GRADE
B
FIX
1
REVIEW
4
PASS
8
INFO
2

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

Mobile Desktop
92
Performance Overall performance score (0–100) based on Core Web Vitals and other metrics. 90+ is good.
79
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.

1.06 s

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

1.59 s

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

0 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.

1.06 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.

1.59 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
15
8 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 (1.2 MiB of 1.2 MiB)
Info::
Third-party blocking time is low (0 ms)
99%
First-party Third-party
B
Page Weight Budget
1.2 MB transferred, 42 requests
REVIEW
1.2 MB transferred, 42 requests
Info::
Page weighs 2.6 MB (1.2 MB 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::
42 HTTP requests
Info::
Estimated 0.24 g CO2 per page load
1.2 MB / 2.4 MB budget
1.2 MB transferred
42 requests
0.24 g CO2 per page load
JavaScript 407.5 KiB 34%
Fonts 361.8 KiB 30%
Images 345.4 KiB 29%
CSS 61.6 KiB 5%
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

C
Image Optimization
Action
7 images, 0 KB saveable
REVIEW
7 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.
7 images 345 KB
0 oversized -0 KB
7 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

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
42 resources · 1.2 MB · 251 KB savings available
REVIEW
42 resources · 1.2 MB · 251 KB savings available
Warning::
Page weight 169 KB over 1MB target
Got: 1.2 MB Expected: ≤ 1 MB
Info::
~251 KB of savings available
Warning::
40 third-party resources (99% of weight)
Info::
1 resources over 200KB
42 resources · 1.2 MiB · 40 third-party 168.6 KiB over 1MB target
JavaScript 34% · 407.5 KiB
Font 30% · 361.8 KiB
Image 29% · 347.4 KiB
CSS 5% · 61.6 KiB
Document 1% · 7.5 KiB
Other 1% · 6.8 KiB

~251.4 KiB of savings available

Remove unused JavaScript: 251.4 KiB
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+
JS Execution Cost
175ms total JS execution
PASS
175ms total JS execution
Info::
Unattributable: 96ms CPU time
Info::
https://www.doi.org/: 79ms CPU time
Warning::
Third-party scripts: 175ms (100% of total)

Main Thread Breakdown

Other 38% Style & Layout 23% Script Evaluation 19% Script Parsing & Compilation 11% Parse HTML & CSS 4% Rendering 4%
ScriptTotalScriptingParse/CompileParty
Unattributable96ms5ms0ms3rd
https://www.doi.org/79ms5ms1ms3rd
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 500 ms 1.0 s 1.5 s FCP 1.1 s LCP 1.6 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 — 15 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 — 16 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 — 59 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 — 53 ms — font-display: swap
l woff2 swap
Size 51 KB
Load time 15 ms
Start 345 ms
Risk FOUT — text flashes from fallback to web font
l woff2 swap
Size 40 KB
Load time 16 ms
Start 346 ms
Risk FOUT — text flashes from fallback to web font
fa-solid-900.woff2 woff2 swap
Size 155 KB
Load time 59 ms
Start 346 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 53 ms
Start 346 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+
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
42 requests over 537ms
INFO
0 ms 500 ms 1.0 s 1.5 s FCP 1.1 s LCP 1.6 shttps://doi.org// https://doi.org/ — 301 — 562 B — 42 ms — h3https://www.doi.org/www.doi.org/ https://www.doi.org/ — 200 — 7.5 KiB — 58 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 — 13 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 — 14 ms — h2https://www.gstatic.com/charts/loader.jswww.gstatic.com/charts/loader.js https://www.gstatic.com/charts/loader.js — 200 — 18.6 KiB — 140 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 — 162 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 — 30 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 — 36 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 — 31 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 — 32 ms — h2https://www.doi.org/images/globe.svgwww.doi.org/images/globe.svg https://www.doi.org/images/globe.svg — 200 — 1.2 KiB — 31 ms — h2https://www.doi.org/images/target.svgwww.doi.org/images/target.svg https://www.doi.org/images/target.svg — 200 — 1.1 KiB — 20 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 — 25 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 — 21 ms — h2https://www.doi.org/js/script.jswww.doi.org/js/script.js https://www.doi.org/js/script.js — 200 — 3.4 KiB — 22 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 — 45 ms — h2https://use.typekit.net/gcr6xms.cssuse.typekit.net/gcr6xms.css https://use.typekit.net/gcr6xms.css — 200 — 920 B — 10 ms — h2https://p.typekit.net/p.css?s=1&k=gcr6xms&ht=tk&f=10884.32874&a=12362348&app=typekit&e=cssp.typekit.net/p.css?s=1&k=gcr6xms&h... https://p.typekit.net/p.css?s=1&k=gcr6xms&ht=tk&f=10884.32874&a=12362348&app=typekit&e=css — 200 — 172 B — 17 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 — 41 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 — 42 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 — 45 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 — 48 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 — 150 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 — 81 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 — 167 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 — 71 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 — 117 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 — 81 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 — 114 ms — h3
0 ms 500 ms 1.0 s 1.5 s FCP 1.1 s LCP 1.6 shttps://doi.org// https://doi.org/ — 301 — 562 B — 42 ms — h3https://www.doi.org/www.doi.org/ https://www.doi.org/ — 200 — 7.5 KiB — 58 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 — 13 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 — 14 ms — h2https://www.gstatic.com/charts/loader.jswww.gstatic.com/charts/loader.js https://www.gstatic.com/charts/loader.js — 200 — 18.6 KiB — 140 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 — 162 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 — 30 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 — 36 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 — 31 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 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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 175ms · 8KB · $1/mo
Unattributable
Other
Optional
Execution 96ms
Transfer 0 KB
Monthly Cost $0/mo
www.doi.org
Other
Optional
Execution 79ms
Transfer 8 KB
Monthly Cost $0/mo

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

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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