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Performance

· 17 checks — Lighthouse + waterfall + sustainability rolled into one auditable list.
SCORE
80
GRADE
B
FIX
2
REVIEW
4
PASS
9
INFO
2

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

Mobile Desktop
43
Performance Overall performance score (0–100) based on Core Web Vitals and other metrics. 90+ is good.
99
Accessibility Measures how accessible the page is for users with disabilities. Checks color contrast, ARIA labels, and semantic HTML.
77
Best Practices Checks for modern web development best practices including HTTPS, no console errors, and secure JavaScript.
85
SEO Measures basic SEO optimizations: meta tags, crawlability, link text, and mobile friendliness.

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

4.61 s

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

12.21 s

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

857 ms

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

0.022

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

4.92 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.

12.53 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
9 PASS 4 REVIEW 2 FIX
F
JS Execution Cost
Action
4002ms total JS execution
FIX
4002ms total JS execution
Warning::
https://plos.org/: 833ms CPU time
Warning::
https://js.hsforms.net/forms/embed/v2.js: 783ms CPU time
Warning::
https://js.hs-analytics.net/analytics/177679740000...: 747ms CPU time
Warning::
https://plos.org/wp-content/themes/plos/resources/...: 473ms CPU time
Warning::
Unattributable: 472ms CPU time
Warning::
Third-party scripts: 2263ms (57% of total)

Main Thread Breakdown

Script Evaluation 51% Style & Layout 18% Other 14% Script Parsing & Compilation 12% Parse HTML & CSS 4%
ScriptTotalScriptingParse/CompileParty
https://plos.org/833ms110ms59ms1st
https://js.hsforms.net/forms/embed/v2.js783ms488ms264ms3rd
https://js.hs-analytics.net/analytics/1776797400000/44092021.js747ms517ms14ms3rd
https://plos.org/wp-content/themes/plos/resources/lib/scripts/jquery-3.5.1.min.js?ver=3.5.1473ms400ms23ms1st
Unattributable472ms21ms0ms3rd
https://plos.org/wp-content/plugins/snazzy-maps/snazzymaps.js?ver=1.5.0231ms155ms2ms1st
https://snap.licdn.com/li.lms-analytics/insight.min.js110ms92ms7ms3rd
https://plos.org/wp-content/themes/plos/dist/scripts/main_bf93fbf5.js?ver=0.0.886ms34ms52ms1st
https://js.hubspot.com/web-interactives-embed.js80ms62ms14ms3rd
https://static.ads-twitter.com/uwt.js72ms64ms6ms3rd

Showing top 10 of 12 scripts

D
Page Weight Inventory
Action
71 resources · 1.5 MB · 232 KB savings available
FIX
71 resources · 1.5 MB · 232 KB savings available
Warning::
Page weight 523 KB over 1MB target
Got: 1.5 MB Expected: ≤ 1 MB
Info::
~232 KB of savings available
Info::
32 third-party resources (28% of weight)
Info::
2 resources over 200KB
71 resources · 1.5 MiB · 32 third-party 522.6 KiB over 1MB target
Image 45% · 696.6 KiB
JavaScript 37% · 575.3 KiB
CSS 7% · 102.7 KiB
Font 6% · 86.0 KiB
Document 5% · 78.4 KiB
Other 0% · 7.6 KiB

~232.0 KiB of savings available

Remove unused JavaScript: 232.0 KiB
B
Page Weight Budget
1.5 MB transferred, 71 requests
REVIEW
1.5 MB transferred, 71 requests
Info::
Page weighs 4.3 MB (1.5 MB transferred)
Warning::
JavaScript is 575 KB — consider code splitting or lazy loading
Large JavaScript bundles delay interactivity. Split code by route or defer non-critical scripts.
Got: 575 KB
Info::
71 HTTP requests
Info::
Estimated 0.32 g CO2 per page load
1.5 MB / 2.4 MB budget
1.5 MB transferred
71 requests
0.32 g CO2 per page load
Images 694.3 KiB 45%
JavaScript 575.3 KiB 37%
CSS 102.7 KiB 7%
Fonts 86.0 KiB 6%
HTML 76.6 KiB 5%
Other 5.5 KiB 0%
Other 3.2 KiB 0%
Other 1.8 KiB 0%
Other 1.2 KiB 0%
0 2.4 MB 4.9 MB
Approaching limit

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

C
Image Optimization
Action
14 images, 0 KB saveable
REVIEW
14 images, 0 KB saveable
Warning::
https://plos.org/wp-content/uploads/2024/11/logo-p... is missing width/height — may cause layout shift
Set explicit width and height to prevent CLS.
Warning::
https://plos.org/wp-content/uploads/2024/11/logo-p... is missing width/height — may cause layout shift
Set explicit width and height to prevent CLS.
14 images 694 KB
0 oversized -0 KB
13 legacy format
2 missing dimensions CLS risk

Set explicit width and height to prevent CLS.

Why this matters

Image without explicit width/height — browser can't reserve space; CLS jumps when image loads.

Source: web.dev / Core Web Vitals

Set explicit width and height to prevent CLS.

Why this matters

Image without explicit width/height — browser can't reserve space; CLS jumps when image loads.

Source: web.dev / Core Web Vitals

C
JS Bundles
Action
33 scripts, 232 KB unused
REVIEW
33 scripts, 232 KB unused
Warning::
https://plos.org/wp-content/themes/plos/dist/scrip...: 78 KB unused (89%)
Consider code splitting or tree shaking to reduce unused code.
Warning::
https://js.hsforms.net/forms/embed/v2.js: 77 KB unused (41%)
Consider code splitting or tree shaking to reduce unused code.
Warning::
https://js.hsforms.net/forms/embed/v2.js: 77 KB unused (41%)
Consider code splitting or tree shaking to reduce unused code.
Info::
Total unused JavaScript: 232 KB
232 KB unused JavaScript

Downloaded but never executed on this page.

ScriptSizeUnusedMinifiedParty
https://plos.org/wp-content/themes/plos/dist/scripts/main_bf93fbf5.js?ver=0.0.898 KB78 KB (89%)✓1st
https://js.hsforms.net/forms/embed/v2.js194 KB77 KB (41%)✓3rd
https://js.hsforms.net/forms/embed/v2.js1 KB77 KB (41%)✓3rd
https://plos.org/wp-includes/js/dist/i18n.min.js?ver=c26c3dc7bed3667933753 KB—✓1st
https://static.ads-twitter.com/uwt.js13 KB—✓3rd
https://plos.org/wp-content/plugins/password-policy-manager/includes/js/moppm_elementor.min.js?ver=2.0.61 KB—✓1st
https://plos.org/wp-content/plugins/plos-elementor-widgets/assets/js/widgets.js?ver=0.0.18 KB—✗1st
https://plos.org/wp-content/plugins/plos-elementor-widgets/assets/lib/slick-1.8.1/slick/slick.js?ver=1.8.117 KB—✗1st
https://js.hs-scripts.com/44092021.js?integration=WordPress&ver=11.3.451 KB—✓3rd
https://plos.org/wp-content/plugins/elementor/assets/js/webpack.runtime.min.js?ver=4.0.23 KB—✓1st

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
HTTP Caching
public, max-age=0, s-maxage=3600
REVIEW
public, max-age=0, s-maxage=3600
Info::
Cache-Control header is set
Got: public, max-age=0, s-maxage=3600
Info::
CDN TTL: 1 hour (s-maxage=3600)
Info::
Last-Modified header present
Cache-Control

public, max-age=0, s-maxage=3600

DirectiveValueMeaning
public—Any cache may store this response
max-age0Cache for 0 seconds
s-maxage3600CDN caches for 1 hour
A
Third-Party Impact
28% third-party, 0 ms blocking
PASS
28% third-party, 0 ms blocking
Info::
Third-party code accounts for 28% of page weight (432.0 KiB of 1.5 MiB)
Info::
Third-party blocking time is low (0 ms)
72%
28%
First-party Third-party
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
3 fonts (86 KB)
PASS
3 fonts (86 KB)
Info::
3 font(s) use font-display: swap (FOUT risk but functional)

Web fonts

3

86 KB total

Render-blocking

0

of 3

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 FCP 4.6 s LCP 12.2 shttps://fonts.gstatic.com/s/opensans/v44/memvYaGs126MiZpBA-UvWbX2vVnXBbObj2OVTS-mu0SC55I.woff2memvYaGs126MiZpBA-UvWbX... https://fonts.gstatic.com/s/opensans/v44/memvYaGs126MiZpBA-UvWbX2vVnXBbObj2OVTS-mu0SC55I.woff2 — 42.0 KiB — 7 ms — font-display: swaphttps://fonts.gstatic.com/s/opensans/v44/memtYaGs126MiZpBA-UFUIcVXSCEkx2cmqvXlWqWuU6FxZCJgg.woff2memtYaGs126MiZpBA-UFUIc... https://fonts.gstatic.com/s/opensans/v44/memtYaGs126MiZpBA-UFUIcVXSCEkx2cmqvXlWqWuU6FxZCJgg.woff2 — 44.0 KiB — 6 ms — font-display: swaphttps://fonts.gstatic.com/s/opensans/v44/memvYaGs126MiZpBA-UvWbX2vVnXBbObj2OVTS-mu0SC55I.woff2memvYaGs126MiZpBA-UvWbX... https://fonts.gstatic.com/s/opensans/v44/memvYaGs126MiZpBA-UvWbX2vVnXBbObj2OVTS-mu0SC55I.woff2 — 0 B — 0 ms — font-display: swap
memvYaGs126MiZpBA-UvWbX... woff2 swap
Size 42 KB
Load time 7 ms
Start 340 ms
Risk FOUT — text flashes from fallback to web font
memtYaGs126MiZpBA-UFUIc... woff2 swap
Size 44 KB
Load time 6 ms
Start 617 ms
Risk FOUT — text flashes from fallback to web font
memvYaGs126MiZpBA-UvWbX... woff2 swap
Size 0 KB
Load time 0 ms
Start 884 ms
Risk FOUT — text flashes from fallback to web font
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)
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
3 hints, 0 missing preconnects
PASS
3 hints, 0 missing preconnects
Info::
Page uses 3 resource hint(s)

Current Resource Hints

preconnect
2
preload
—
dns-prefetch
1
prefetch
—

3 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
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

Network Waterfall
71 requests over 1943ms
INFO
0 ms 2.0 s 4.0 s 6.0 s 8.0 s 10.0 s 12.0 s FCP 4.6 s LCP 12.2 shttps://plos.org// https://plos.org/ — 200 — 76.6 KiB — 68 ms — h2https://plos.org/wp-content/plugins/orcid-master/assets/orcid.css?ver=6.9.4/wp-content/plugins/orcid-master/as... https://plos.org/wp-content/plugins/orcid-master/assets/orcid.css?ver=6.9.4 — 200 — 548 B — 61 ms — h2https://plos.org/wp-content/plugins/elementor/assets/lib/eicons/css/elementor-icons.min.css?ver=5.48.0/wp-content/plugins/elementor/asset... https://plos.org/wp-content/plugins/elementor/assets/lib/eicons/css/elementor-icons.min.css?ver=5.48.0 — 200 — 4.8 KiB — 72 ms — h2https://plos.org/wp-content/uploads/elementor/css/custom-frontend.min.css?ver=1776412090/wp-content/uploads/elementor/css/c... https://plos.org/wp-content/uploads/elementor/css/custom-frontend.min.css?ver=1776412090 — 200 — 8.2 KiB — 90 ms — h2https://plos.org/wp-content/uploads/elementor/css/post-3286.css?ver=1776412090/wp-content/uploads/elementor/css/p... https://plos.org/wp-content/uploads/elementor/css/post-3286.css?ver=1776412090 — 200 — 966 B — 52 ms — h2https://plos.org/wp-content/plugins/elementor/assets/css/widget-heading.min.css?ver=4.0.2/wp-content/plugins/elementor/asset... https://plos.org/wp-content/plugins/elementor/assets/css/widget-heading.min.css?ver=4.0.2 — 200 — 436 B — 56 ms — h2https://plos.org/wp-content/plugins/elementor/assets/css/widget-spacer.min.css?ver=4.0.2/wp-content/plugins/elementor/asset... https://plos.org/wp-content/plugins/elementor/assets/css/widget-spacer.min.css?ver=4.0.2 — 200 — 648 B — 53 ms — h2https://plos.org/wp-content/plugins/elementor/assets/css/widget-divider.min.css?ver=4.0.2/wp-content/plugins/elementor/asset... https://plos.org/wp-content/plugins/elementor/assets/css/widget-divider.min.css?ver=4.0.2 — 200 — 1.1 KiB — 79 ms — h2https://plos.org/wp-content/uploads/elementor/css/post-51.css?ver=1776412090/wp-content/uploads/elementor/css/p... https://plos.org/wp-content/uploads/elementor/css/post-51.css?ver=1776412090 — 200 — 2.2 KiB — 76 ms — h2https://plos.org/wp-content/themes/plos/dist/styles/main_bf93fbf5.css?ver=6.9.4/wp-content/themes/plos/dist/styles... https://plos.org/wp-content/themes/plos/dist/styles/main_bf93fbf5.css?ver=6.9.4 — 200 — 79.7 KiB — 97 ms — h2https://plos.org/wp-content/themes/plos/resources/lib/scripts/jquery-3.5.1.min.js?ver=3.5.1/wp-content/themes/plos/resources/l... https://plos.org/wp-content/themes/plos/resources/lib/scripts/jquery-3.5.1.min.js?ver=3.5.1 — 200 — 33.1 KiB — 89 ms — h2https://plos.org/wp-includes/js/jquery/jquery-migrate.min.js?ver=3.4.1/wp-includes/js/jquery/jquery-migra... https://plos.org/wp-includes/js/jquery/jquery-migrate.min.js?ver=3.4.1 — 200 — 5.5 KiB — 60 ms — h2https://plos.org/wp-content/plugins/orcid-master/assets/orcid.js?ver=6.9.4/wp-content/plugins/orcid-master/as... https://plos.org/wp-content/plugins/orcid-master/assets/orcid.js?ver=6.9.4 — 200 — 1.3 KiB — 73 ms — h2https://plos.org/wp-content/plugins/snazzy-maps/snazzymaps.js?ver=1.5.0/wp-content/plugins/snazzy-maps/sna... https://plos.org/wp-content/plugins/snazzy-maps/snazzymaps.js?ver=1.5.0 — 200 — 2.5 KiB — 62 ms — h2https://fonts.googleapis.com/css2?family=Merriweather:ital,opsz,wght@0,18..144,300..900;1,18..144,300..900&family=Open+Sans:ital,wght@0,300..800;1,300..800&display=swapfonts.googleapis.com/css2?family=Me... https://fonts.googleapis.com/css2?family=Merriweather:ital,opsz,wght@0,18..144,300..900;1,18..144,300..900&family=Open+Sans:ital,wght@0,300..800;1,300..800&display=swap — 200 — 2.4 KiB — 18 ms — h2https://plos.org/wp-content/uploads/2024/11/logo-plos-full-color.svg/wp-content/uploads/2024/11/logo-pl... https://plos.org/wp-content/uploads/2024/11/logo-plos-full-color.svg — 200 — 2.3 KiB — 78 ms — h2https://plos.org/wp-content/uploads/2024/11/logo-plos-white.svg/wp-content/uploads/2024/11/logo-pl... https://plos.org/wp-content/uploads/2024/11/logo-plos-white.svg — 200 — 2.3 KiB — 65 ms — h2https://js.hsforms.net/forms/embed/v2.jsjs.hsforms.net/forms/embed/v2.js https://js.hsforms.net/forms/embed/v2.js — 200 — 193.8 KiB — 51 ms — h3https://plos.org/wp-content/plugins/password-policy-manager/includes/js/moppm_elementor.min.js?ver=2.0.6/wp-content/plugins/password-policy... https://plos.org/wp-content/plugins/password-policy-manager/includes/js/moppm_elementor.min.js?ver=2.0.6 — 200 — 1017 B — 47 ms — h3https://plos.org/wp-content/plugins/plos-elementor-widgets/assets/js/widgets.js?ver=0.0.1/wp-content/plugins/plos-elementor-... https://plos.org/wp-content/plugins/plos-elementor-widgets/assets/js/widgets.js?ver=0.0.1 — 200 — 8.1 KiB — 30 ms — h3https://plos.org/wp-content/plugins/plos-elementor-widgets/assets/lib/slick-1.8.1/slick/slick.js?ver=1.8.1/wp-content/plugins/plos-elementor-... https://plos.org/wp-content/plugins/plos-elementor-widgets/assets/lib/slick-1.8.1/slick/slick.js?ver=1.8.1 — 200 — 17.4 KiB — 31 ms — h3https://js.hs-scripts.com/44092021.js?integration=WordPress&ver=11.3.45js.hs-scripts.com/44092021.js?integ... https://js.hs-scripts.com/44092021.js?integration=WordPress&ver=11.3.45 — 200 — 1.1 KiB — 274 ms — h2https://plos.org/wp-content/plugins/elementor/assets/js/webpack.runtime.min.js?ver=4.0.2/wp-content/plugins/elementor/asset... https://plos.org/wp-content/plugins/elementor/assets/js/webpack.runtime.min.js?ver=4.0.2 — 200 — 3.1 KiB — 30 ms — h3https://plos.org/wp-content/plugins/elementor/assets/js/frontend-modules.min.js?ver=4.0.2/wp-content/plugins/elementor/asset... https://plos.org/wp-content/plugins/elementor/assets/js/frontend-modules.min.js?ver=4.0.2 — 200 — 17.6 KiB — 42 ms — h3https://plos.org/wp-includes/js/jquery/ui/core.min.js?ver=1.13.3/wp-includes/js/jquery/ui/core.min.... https://plos.org/wp-includes/js/jquery/ui/core.min.js?ver=1.13.3 — 200 — 7.9 KiB — 40 ms — h3https://plos.org/wp-content/plugins/elementor/assets/js/frontend.min.js?ver=4.0.2/wp-content/plugins/elementor/asset... https://plos.org/wp-content/plugins/elementor/assets/js/frontend.min.js?ver=4.0.2 — 200 — 11.5 KiB — 49 ms — h3https://plos.org/wp-content/themes/plos/dist/scripts/main_bf93fbf5.js?ver=0.0.8/wp-content/themes/plos/dist/script... https://plos.org/wp-content/themes/plos/dist/scripts/main_bf93fbf5.js?ver=0.0.8 — 200 — 97.7 KiB — 65 ms — h3https://plos.org/wp-content/plugins/elementor-pro/assets/js/webpack-pro.runtime.min.js?ver=4.0.2/wp-content/plugins/elementor-pro/a... https://plos.org/wp-content/plugins/elementor-pro/assets/js/webpack-pro.runtime.min.js?ver=4.0.2 — 200 — 3.3 KiB — 53 ms — h3https://plos.org/wp-includes/js/dist/hooks.min.js?ver=dd5603f07f9220ed27f1/wp-includes/js/dist/hooks.min.js?v... https://plos.org/wp-includes/js/dist/hooks.min.js?ver=dd5603f07f9220ed27f1 — 200 — 2.6 KiB — 45 ms — h3https://plos.org/wp-includes/js/dist/i18n.min.js?ver=c26c3dc7bed366793375/wp-includes/js/dist/i18n.min.js?ve... https://plos.org/wp-includes/js/dist/i18n.min.js?ver=c26c3dc7bed366793375 — 200 — 2.8 KiB — 41 ms — h3
0 ms 2.0 s 4.0 s 6.0 s 8.0 s 10.0 s 12.0 s FCP 4.6 s LCP 12.2 shttps://plos.org// https://plos.org/ — 200 — 76.6 KiB — 68 ms — h2https://plos.org/wp-content/plugins/orcid-master/assets/orcid.css?ver=6.9.4/wp-content/plugins/orcid-master/as... https://plos.org/wp-content/plugins/orcid-master/assets/orcid.css?ver=6.9.4 — 200 — 548 B — 61 ms — h2https://plos.org/wp-content/plugins/elementor/assets/lib/eicons/css/elementor-icons.min.css?ver=5.48.0/wp-content/plugins/elementor/asset... https://plos.org/wp-content/plugins/elementor/assets/lib/eicons/css/elementor-icons.min.css?ver=5.48.0 — 200 — 4.8 KiB — 72 ms — h2https://plos.org/wp-content/uploads/elementor/css/custom-frontend.min.css?ver=1776412090/wp-content/uploads/elementor/css/c... https://plos.org/wp-content/uploads/elementor/css/custom-frontend.min.css?ver=1776412090 — 200 — 8.2 KiB — 90 ms — h2https://plos.org/wp-content/uploads/elementor/css/post-3286.css?ver=1776412090/wp-content/uploads/elementor/css/p... 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— 200 — 1.1 KiB — 270 ms — h2https://track.hubspot.com/__ptq.gif?k=15&fi=70d8b992-3c0e-4a15-91fa-652de72cbcd3&fci=6d0d8db4-e4da-4744-ad9d-e5e09ba0c67a&ft=0&sd=412x823&cd=24-bit&cs=UTF-8&ln=en-us&bfp=e2a0afc247676678f24e50010fe14ccd&v=1.1&a=44092021&ct=standard-page&rcu=https%3A%2F%2Fplos.org%2F&pu=https%3A%2F%2Fplos.org%2F&t=Leading+the+future+of+open+science+publishing+-+PLOS&cts=1776797412914&vi=5b802c3c5ae35203a9f449bb265a8e7c&nc=true&u=57028661.5b802c3c5ae35203a9f449bb265a8e7c.1776797412908.1776797412908.1776797412908.1&b=57028661.1.1776797412908&cc=15track.hubspot.com/__ptq.gif?k=15&fi... https://track.hubspot.com/__ptq.gif?k=15&fi=70d8b992-3c0e-4a15-91fa-652de72cbcd3&fci=6d0d8db4-e4da-4744-ad9d-e5e09ba0c67a&ft=0&sd=412x823&cd=24-bit&cs=UTF-8&ln=en-us&bfp=e2a0afc247676678f24e50010fe14ccd&v=1.1&a=44092021&ct=standard-page&rcu=https%3A%2F%2Fplos.org%2F&pu=https%3A%2F%2Fplos.org%2F&t=Leading+the+future+of+open+science+publishing+-+PLOS&cts=1776797412914&vi=5b802c3c5ae35203a9f449bb265a8e7c&nc=true&u=57028661.5b802c3c5ae35203a9f449bb265a8e7c.1776797412908.1776797412908.1776797412908.1&b=57028661.1.1776797412908&cc=15 — 200 — 752 B — 276 ms — h2https://px.ads.linkedin.com/wa/?medium=fetch&fmt=gpx.ads.linkedin.com/wa/?medium=fetc... https://px.ads.linkedin.com/wa/?medium=fetch&fmt=g — 204 — 43 B — 252 ms — h3https://plos.org/wp-content/themes/plos/favicon/site.webmanifest/wp-content/themes/plos/favicon/sit... https://plos.org/wp-content/themes/plos/favicon/site.webmanifest — 403 — 891 B — 241 ms — h3https://plos.org/wp-content/themes/plos/favicon/favicon.ico/wp-content/themes/plos/favicon/fav... https://plos.org/wp-content/themes/plos/favicon/favicon.ico — 200 — 2.3 KiB — 28 ms — h3
HTML JavaScript CSS Images Fonts XHR/Fetch Other
Third-Party Script Cost
Per-script blocking time, transfer cost, and cache headers
INFO
57% of JavaScript execution is third-party
First-party Third-party 2263ms · 104KB · $30/mo
js.hsforms.net
Other
Costly
Execution 783ms
Transfer 1 KB
Unused 41%
Monthly Cost $10/mo
HubSpot Analytics
Analytics
Costly
Execution 747ms
Transfer 42 KB
Monthly Cost $10/mo
Unattributable
Other
Costly
Execution 472ms
Transfer 0 KB
Monthly Cost $6/mo
LinkedIn Insight
Advertising
Optional
Execution 110ms
Transfer 19 KB
Monthly Cost $1/mo
js.hubspot.com
Other
Optional
Execution 80ms
Transfer 28 KB
Monthly Cost $1/mo
Twitter/X Pixel
Advertising
Optional
Execution 72ms
Transfer 13 KB
Monthly Cost $1/mo

These scripts may cost more than they're worth

  • js.hsforms.net adds 783ms and costs ~$10/month
  • HubSpot Analytics adds 747ms and costs ~$10/month
  • Unattributable adds 472ms and costs ~$6/month

57% 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

js.hsforms.net takes 783ms 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

HubSpot Analytics takes 747ms 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 472ms 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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