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Performance

· 15 checks — Lighthouse + waterfall + sustainability rolled into one auditable list.
SCORE
80
GRADE
B
FIX
1
REVIEW
5
PASS
7
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.
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.

771 ms

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

1.74 s

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

42 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.

1.10 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.

2.25 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
7 PASS 5 REVIEW 1 FIX
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 522 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 522.3 KiB over 1MB target
Image 45% · 696.6 KiB
JavaScript 37% · 575.2 KiB
CSS 7% · 102.5 KiB
Font 6% · 86.0 KiB
Document 5% · 78.6 KiB
Other 0% · 7.4 KiB

~232.1 KiB of savings available

Remove unused JavaScript: 232.1 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 575.2 KiB 37%
CSS 102.5 KiB 7%
Fonts 86.0 KiB 6%
HTML 76.8 KiB 5%
Other 5.4 KiB 0%
Other 3.0 KiB 0%
Other 1.8 KiB 0%
Other 1.3 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

B
JS Execution Cost
932ms total JS execution
REVIEW
932ms total JS execution
Warning::
https://plos.org/: 253ms CPU time
Info::
https://js.hsforms.net/forms/embed/v2.js: 234ms CPU time
Info::
https://js.hs-analytics.net/analytics/177679740000...: 159ms CPU time
Info::
https://plos.org/wp-content/themes/plos/resources/...: 119ms CPU time
Info::
Unattributable: 108ms CPU time
Warning::
Third-party scripts: 502ms (54% of total)

Main Thread Breakdown

Script Evaluation 48% Other 19% Style & Layout 14% Script Parsing & Compilation 13% Parse HTML & CSS 4%
ScriptTotalScriptingParse/CompileParty
https://plos.org/253ms31ms15ms1st
https://js.hsforms.net/forms/embed/v2.js234ms130ms91ms3rd
https://js.hs-analytics.net/analytics/1776797400000/44092021.js159ms108ms4ms3rd
https://plos.org/wp-content/themes/plos/resources/lib/scripts/jquery-3.5.1.min.js?ver=3.5.1119ms102ms3ms1st
Unattributable108ms5ms0ms3rd
https://plos.org/wp-content/plugins/snazzy-maps/snazzymaps.js?ver=1.5.058ms41ms0ms1st
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 (431.7 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 500 ms 1.0 s 1.5 s FCP 771 ms LCP 1.7 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 — 17 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 — 7 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 17 ms
Start 201 ms
Risk FOUT — text flashes from fallback to web font
memtYaGs126MiZpBA-UFUIc... woff2 swap
Size 44 KB
Load time 7 ms
Start 587 ms
Risk FOUT — text flashes from fallback to web font
memvYaGs126MiZpBA-UvWbX... woff2 swap
Size 0 KB
Load time 0 ms
Start 855 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
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

Network Waterfall
71 requests over 2101ms
INFO
0 ms 500 ms 1.0 s 1.5 s 2.0 s FCP 771 ms LCP 1.7 shttps://plos.org// https://plos.org/ — 200 — 76.8 KiB — 45 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 — 552 B — 38 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 — 4.9 KiB — 35 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 — 8.1 KiB — 40 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 — 902 B — 38 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 — 457 B — 41 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 — 725 B — 44 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 — 56 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 — 51 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 — 79.6 KiB — 65 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 — 61 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 — 59 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 — 1.4 KiB — 38 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 — 2.4 KiB — 43 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 — 16 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 — 47 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 — 40 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 — 54 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 — 1006 B — 43 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 — 51 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 — 83 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 — 26 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 — 74 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 — 17.5 KiB — 56 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 — 76 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 — 76 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 — 97.8 KiB — 88 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 — 54 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 — 75 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 — 85 ms — h3
0 ms 500 ms 1.0 s 1.5 s 2.0 s FCP 771 ms LCP 1.7 shttps://plos.org// https://plos.org/ — 200 — 76.8 KiB — 45 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 — 552 B — 38 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 — 4.9 KiB — 35 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 — 8.1 KiB — 40 ms — h2https://plos.org/wp-content/uploads/elementor/css/post-3286.css?ver=1776412090/wp-content/uploads/elementor/css/p... 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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
54% of JavaScript execution is third-party
First-party Third-party 502ms · 43KB · $7/mo
js.hsforms.net
Other
Costly
Execution 234ms
Transfer 1 KB
Unused 41%
Monthly Cost $3/mo
HubSpot Analytics
Analytics
Optional
Execution 159ms
Transfer 42 KB
Monthly Cost $2/mo
Unattributable
Other
Optional
Execution 108ms
Transfer 0 KB
Monthly Cost $1/mo

These scripts may cost more than they're worth

  • js.hsforms.net adds 234ms and costs ~$3/month

54% 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 234ms 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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