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Performance

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

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

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

340 ms

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

821 ms

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

14 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.

396 ms

Time to Interactive Time to Interactive — how long until the page is fully interactive and responds to user input. Under 3.8s is good.

1.78 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
10 PASS 1 REVIEW 2 FIX
D
Third-Party Impact
Action
72% third-party, 0 ms blocking
FIX
72% third-party, 0 ms blocking
Warning::
Third-party code accounts for 72% of page weight (481.5 KiB of 671.4 KiB)
Info::
Third-party blocking time is low (0 ms)
28%
72%
First-party Third-party
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.
Info::
Last-Modified header present

No Cache-Control header

Adding a Cache-Control header can significantly improve repeat-visit performance.

C
JS Bundles
Action
20 scripts, 154 KB unused
REVIEW
20 scripts, 154 KB unused
Warning::
https://www.googletagmanager.com/gtag/js?id=G-GT6V...: 65 KB unused (40%)
Consider code splitting or tree shaking to reduce unused code.
Warning::
https://eu-us-cdn.consentmanager.net/delivery/js/c...: 48 KB unused (48%)
Consider code splitting or tree shaking to reduce unused code.
Warning::
https://scripts.pubnation.com/tags/3.44.9__cgroup3...: 42 KB unused (54%)
Consider code splitting or tree shaking to reduce unused code.
Info::
Total unused JavaScript: 154 KB
154 KB unused JavaScript

Downloaded but never executed on this page.

ScriptSizeUnusedMinifiedParty
https://www.googletagmanager.com/gtag/js?id=G-GT6V1PPT8H161 KB65 KB (40%)✓3rd
https://eu-us-cdn.consentmanager.net/delivery/js/cmp_final.min.js?t=2026-4-21101 KB48 KB (48%)✓3rd
https://scripts.pubnation.com/tags/3.44.9__cgroup3.44.10-3774-eids.1/wrapper.min.js?bust=-208275845878 KB42 KB (54%)✓3rd
https://sciencedaily.com/js/custom-202307301940.js3 KB—✓1st
https://scripts.pubnation.com/tags/cmp/e8484401c62373a45398.min.js9 KB—✓3rd
https://exchange.pubnation.com/usersync.min.js?s2sVersion=production5 KB—✓3rd
https://sciencedaily.com/js/jquery-3.6.0.min.js32 KB—✓1st
https://sciencedaily.com/js/bootstrap-3.4.1.min.js11 KB—✓1st
https://sciencedaily.com/js/jQuery.print.js3 KB—✓1st
https://sciencedaily.com/js/social-share-kit.min.js3 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

A+
Page Weight Budget
671 KB transferred, 39 requests
PASS
671 KB transferred, 39 requests
Info::
Page weighs 2.2 MB (671 KB transferred)
Warning::
JavaScript is 524 KB — consider code splitting or lazy loading
Large JavaScript bundles delay interactivity. Split code by route or defer non-critical scripts.
Got: 524 KB
Info::
39 HTTP requests
Info::
Estimated 0.14 g CO2 per page load
671 KB / 2.4 MB budget
671 KB transferred
39 requests
0.14 g CO2 per page load
JavaScript 524.3 KiB 78%
Fonts 64.3 KiB 10%
HTML 35.5 KiB 5%
CSS 28.4 KiB 4%
Images 7.2 KiB 1%
Other 5.7 KiB 1%
Other 4.4 KiB 1%
Other 1.2 KiB 0%
Other 558 B 0%
Other 0 B 0%
0 2.4 MB 4.9 MB
Under budget

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

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
2 images, 0 KB saveable
PASS
2 images, 0 KB saveable
Info::
All images are well-optimized
2 images 7 KB
0 oversized -0 KB
2 legacy format
0 missing dimensions CLS risk
A+
JS Execution Cost
451ms total JS execution
PASS
451ms total JS execution
Info::
https://sciencedaily.com/: 181ms CPU time
Info::
https://www.googletagmanager.com/gtag/js?id=G-GT6V...: 82ms CPU time
Info::
https://eu-us-cdn.consentmanager.net/delivery/cust...: 73ms CPU time
Info::
Unattributable: 62ms CPU time
Info::
https://scripts.pubnation.com/tags/cmp/e8484401c62...: 54ms CPU time
Warning::
Third-party scripts: 270ms (60% of total)

Main Thread Breakdown

Script Evaluation 49% Style & Layout 22% Other 14% Script Parsing & Compilation 9% Parse HTML & CSS 3%
ScriptTotalScriptingParse/CompileParty
https://sciencedaily.com/181ms1ms0ms1st
https://www.googletagmanager.com/gtag/js?id=G-GT6V1PPT8H82ms66ms15ms3rd
https://eu-us-cdn.consentmanager.net/delivery/customdata/bV8xLndfMTM0MzQ5LnJfQ0NQQS5sX2VuLmRfNDQ1MTcueF82Ni52LnAudF80NDUxNy54dF8yNTc2.js73ms67ms4ms3rd
Unattributable62ms3ms0ms3rd
https://scripts.pubnation.com/tags/cmp/e8484401c62373a45398.min.js54ms52ms1ms3rd
A+
Font Loading
1 fonts (64 KB)
PASS
1 fonts (64 KB)
Info::
1 font(s) use font-display: swap (FOUT risk but functional)

Web fonts

1

64 KB total

Render-blocking

0

of 1

Dominant font-display

swap

Most common across fonts

Font loading timeline
Transfer FOIT (block) FOUT (swap)
0 ms 500 ms 1.0 s FCP 340 ms LCP 821 mshttps://sciencedaily.com/fonts/fontawesome-webfont.woff?v=4.2.0fontawesome-webfont.woff https://sciencedaily.com/fonts/fontawesome-webfont.woff?v=4.2.0 — 64.3 KiB — 13 ms — font-display: swap
fontawesome-webfont.woff woff swap
Size 64 KB
Load time 13 ms
Start 233 ms
Risk FOUT — text flashes from fallback to web font
  • Convert to woff2 for ~30% smaller file size
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 ~19 KB and ~38 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
Page Weight Inventory
39 resources · 671 KB · 154 KB savings available
PASS
39 resources · 671 KB · 154 KB savings available
Info::
Within 1MB page-weight target
Got: 671 KB
Info::
~154 KB of savings available
Warning::
25 third-party resources (72% of weight)
39 resources · 671.4 KiB · 25 third-party Within 1MB page-weight target
JavaScript 79% · 527.8 KiB
Font 10% · 64.3 KiB
Document 5% · 35.5 KiB
CSS 4% · 28.4 KiB
Image 2% · 12.8 KiB
Other 0% · 2.6 KiB

~154.4 KiB of savings available

Remove unused JavaScript: 154.4 KiB
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
39 requests over 883ms
INFO
0 ms 200 ms 400 ms 600 ms 800 ms FCP 340 ms LCP 821 mshttps://sciencedaily.com// https://sciencedaily.com/ — 200 — 33.3 KiB — 305 ms — h2https://sciencedaily.com/css/bootstrap.min.css/css/bootstrap.min.css https://sciencedaily.com/css/bootstrap.min.css — 200 — 14.0 KiB — 24 ms — h2https://sciencedaily.com/css/font-awesome.min.css/css/font-awesome.min.css https://sciencedaily.com/css/font-awesome.min.css — 200 — 5.2 KiB — 18 ms — h2https://sciencedaily.com/css/yamm.css/css/yamm.css https://sciencedaily.com/css/yamm.css — 200 — 571 B — 16 ms — h2https://sciencedaily.com/css/social-share-kit.css/css/social-share-kit.css https://sciencedaily.com/css/social-share-kit.css — 200 — 3.0 KiB — 19 ms — h2https://sciencedaily.com/css/custom-202404121350.css/css/custom-202404121350.css https://sciencedaily.com/css/custom-202404121350.css — 200 — 5.6 KiB — 21 ms — h2https://sciencedaily.com/images/sd-logo.png/images/sd-logo.png https://sciencedaily.com/images/sd-logo.png — 200 — 7.1 KiB — 20 ms — h2https://www.googletagmanager.com/gtag/js?id=G-GT6V1PPT8Hwww.googletagmanager.com/gtag/js?id... https://www.googletagmanager.com/gtag/js?id=G-GT6V1PPT8H — 200 — 160.7 KiB — 66 ms — h2https://scripts.pubnation.com/tags/197d605c-8b0a-4d0c-8229-cd0e28a78762.jsscripts.pubnation.com/tags/197d605c... https://scripts.pubnation.com/tags/197d605c-8b0a-4d0c-8229-cd0e28a78762.js — 200 — 17.8 KiB — 17 ms — h2https://sciencedaily.com/fonts/fontawesome-webfont.woff?v=4.2.0/fonts/fontawesome-webfont.woff?v=4... https://sciencedaily.com/fonts/fontawesome-webfont.woff?v=4.2.0 — 200 — 64.3 KiB — 13 ms — h2https://securepubads.g.doubleclick.net/tag/js/gpt.jssecurepubads.g.doubleclick.net/tag/... https://securepubads.g.doubleclick.net/tag/js/gpt.js — 200 — 34.0 KiB — 45 ms — h3https://scripts.pubnation.com/flooring/countryLookupscripts.pubnation.com/flooring/coun... https://scripts.pubnation.com/flooring/countryLookup — 200 — 187 B — 11 ms — h2https://scripts.pubnation.com/launcher/settings.json?off=pubnationscripts.pubnation.com/launcher/sett... https://scripts.pubnation.com/launcher/settings.json?off=pubnation — 200 — 3.5 KiB — 11 ms — h2https://keywords.pubnation.com/keyword?pageUrl=https://www.sciencedaily.com/keywords.pubnation.com/keyword?page... https://keywords.pubnation.com/keyword?pageUrl=https://www.sciencedaily.com/ — 204 — 0 B — 22 ms — h2https://scripts.pubnation.com/tags/3.44.9__cgroup3.44.10-3774-eids.1/wrapper.min.js?bust=-2082758458scripts.pubnation.com/tags/3.44.9__... https://scripts.pubnation.com/tags/3.44.9__cgroup3.44.10-3774-eids.1/wrapper.min.js?bust=-2082758458 — 200 — 78.2 KiB — 19 ms — h2https://exchange.pubnation.com/usersync.min.js?s2sVersion=productionexchange.pubnation.com/usersync.min... https://exchange.pubnation.com/usersync.min.js?s2sVersion=production — 200 — 5.3 KiB — 40 ms — h2https://keywords.pubnation.com/keyword?pageUrl=https://www.sciencedaily.com/keywords.pubnation.com/keyword?page... https://keywords.pubnation.com/keyword?pageUrl=https://www.sciencedaily.com/ — 200 — 359 B — 7 ms — h2https://sciencedaily.com/js/jquery-3.6.0.min.js/js/jquery-3.6.0.min.js https://sciencedaily.com/js/jquery-3.6.0.min.js — 200 — 31.6 KiB — 31 ms — h2https://sciencedaily.com/js/bootstrap-3.4.1.min.js/js/bootstrap-3.4.1.min.js https://sciencedaily.com/js/bootstrap-3.4.1.min.js — 200 — 11.4 KiB — 21 ms — h2https://sciencedaily.com/js/jQuery.print.js/js/jQuery.print.js https://sciencedaily.com/js/jQuery.print.js — 200 — 2.8 KiB — 16 ms — h2https://sciencedaily.com/js/social-share-kit.min.js/js/social-share-kit.min.js https://sciencedaily.com/js/social-share-kit.min.js — 200 — 2.8 KiB — 18 ms — h2https://sciencedaily.com/js/custom-202307301940.js/js/custom-202307301940.js https://sciencedaily.com/js/custom-202307301940.js — 200 — 2.7 KiB — 28 ms — h2https://analytics.google.com/g/collect?v=2&tid=G-GT6V1PPT8H&gtm=45je64h1v882001302za200zd882001302&_p=1776797704146&_gaz=1&gcd=13l3l3l3l1l1&npa=0&dma=0&_eu=AAAAAGA&are=1&cid=1969771678.1776797704&frm=0&pscdl=noapi&rcb=3&sr=800x600&uaa=x86&uab=64&uafvl=Not-A.Brand%3B24.0.0.0%7CChromium%3B146.0.7680.164&uam=&uamb=0&uap=macOS&uapv=10.15.7&uaw=0&ul=en-us&_s=1&tag_exp=0~115616985~115938466~115938469~117266401~117384406~117512542&sid=1776797704&sct=1&seg=0&dl=https%3A%2F%2Fsciencedaily.com%2F&dt=ScienceDaily%3A%20Your%20source%20for%20the%20latest%20research%20news&en=page_view&_fv=1&_nsi=1&_ss=1&_ee=1&tfd=529analytics.google.com/g/collect?v=2&... https://analytics.google.com/g/collect?v=2&tid=G-GT6V1PPT8H&gtm=45je64h1v882001302za200zd882001302&_p=1776797704146&_gaz=1&gcd=13l3l3l3l1l1&npa=0&dma=0&_eu=AAAAAGA&are=1&cid=1969771678.1776797704&frm=0&pscdl=noapi&rcb=3&sr=800x600&uaa=x86&uab=64&uafvl=Not-A.Brand%3B24.0.0.0%7CChromium%3B146.0.7680.164&uam=&uamb=0&uap=macOS&uapv=10.15.7&uaw=0&ul=en-us&_s=1&tag_exp=0~115616985~115938466~115938469~117266401~117384406~117512542&sid=1776797704&sct=1&seg=0&dl=https%3A%2F%2Fsciencedaily.com%2F&dt=ScienceDaily%3A%20Your%20source%20for%20the%20latest%20research%20news&en=page_view&_fv=1&_nsi=1&_ss=1&_ee=1&tfd=529 — 204 — 549 B — 52 ms — h2https://stats.g.doubleclick.net/g/collect?v=2&tid=G-GT6V1PPT8H&cid=1969771678.1776797704&gtm=45je64h1v882001302za200zd882001302&rcb=3&aip=1&dma=0&gcd=13l3l3l3l1l1&npa=0&frm=0&tag_exp=0~115616985~115938466~115938469~117266401~117384406~117512542stats.g.doubleclick.net/g/collect?v... https://stats.g.doubleclick.net/g/collect?v=2&tid=G-GT6V1PPT8H&cid=1969771678.1776797704&gtm=45je64h1v882001302za200zd882001302&rcb=3&aip=1&dma=0&gcd=13l3l3l3l1l1&npa=0&frm=0&tag_exp=0~115616985~115938466~115938469~117266401~117384406~117512542 — 204 — 558 B — 40 ms — h2https://exchange.pubnation.com/ias/check?s2sVersion=productionexchange.pubnation.com/ias/check?s2... https://exchange.pubnation.com/ias/check?s2sVersion=production — 200 — 321 B — 12 ms — h2https://scripts.pubnation.com/tags/3318/fa6cd5e582c41b54b01c.min.jsscripts.pubnation.com/tags/3318/fa6... https://scripts.pubnation.com/tags/3318/fa6cd5e582c41b54b01c.min.js — 200 — 4.1 KiB — 3 ms — h2https://scripts.pubnation.com/tags/cmp/e8484401c62373a45398.min.jsscripts.pubnation.com/tags/cmp/e848... https://scripts.pubnation.com/tags/cmp/e8484401c62373a45398.min.js — 200 — 9.4 KiB — 5 ms — h2https://sciencedaily.com/favicon.ico/favicon.ico https://sciencedaily.com/favicon.ico — 200 — 5.7 KiB — 21 ms — h2https://eu-us.consentmanager.net/delivery/cmp.php?&cdid=aae8faf2c2da9&h=https%3A%2F%2Fsciencedaily.com%2F&&cmpsetcc=US-NJ&__cmpfcc=1&l=en&ls=EN_EN_EN&lp=EN&o=1776797704543eu-us.consentmanager.net/delivery/c... https://eu-us.consentmanager.net/delivery/cmp.php?&cdid=aae8faf2c2da9&h=https%3A%2F%2Fsciencedaily.com%2F&&cmpsetcc=US-NJ&__cmpfcc=1&l=en&ls=EN_EN_EN&lp=EN&o=1776797704543 — 200 — 2.5 KiB — 115 ms — h2https://eu-us-cdn.consentmanager.net/delivery/js/cmp_final.min.js?t=2026-4-21eu-us-cdn.consentmanager.net/delive... https://eu-us-cdn.consentmanager.net/delivery/js/cmp_final.min.js?t=2026-4-21 — 200 — 100.9 KiB — 26 ms — h2
0 ms 200 ms 400 ms 600 ms 800 ms FCP 340 ms LCP 821 mshttps://sciencedaily.com// https://sciencedaily.com/ — 200 — 33.3 KiB — 305 ms — h2https://sciencedaily.com/css/bootstrap.min.css/css/bootstrap.min.css https://sciencedaily.com/css/bootstrap.min.css — 200 — 14.0 KiB — 24 ms — h2https://sciencedaily.com/css/font-awesome.min.css/css/font-awesome.min.css https://sciencedaily.com/css/font-awesome.min.css — 200 — 5.2 KiB — 18 ms — h2https://sciencedaily.com/css/yamm.css/css/yamm.css https://sciencedaily.com/css/yamm.css — 200 — 571 B — 16 ms — h2https://sciencedaily.com/css/social-share-kit.css/css/social-share-kit.css https://sciencedaily.com/css/social-share-kit.css — 200 — 3.0 KiB — 19 ms — h2https://sciencedaily.com/css/custom-202404121350.css/css/custom-202404121350.css https://sciencedaily.com/css/custom-202404121350.css — 200 — 5.6 KiB — 21 ms — h2https://sciencedaily.com/images/sd-logo.png/images/sd-logo.png https://sciencedaily.com/images/sd-logo.png — 200 — 7.1 KiB — 20 ms — h2https://www.googletagmanager.com/gtag/js?id=G-GT6V1PPT8Hwww.googletagmanager.com/gtag/js?id... https://www.googletagmanager.com/gtag/js?id=G-GT6V1PPT8H — 200 — 160.7 KiB — 66 ms — h2https://scripts.pubnation.com/tags/197d605c-8b0a-4d0c-8229-cd0e28a78762.jsscripts.pubnation.com/tags/197d605c... https://scripts.pubnation.com/tags/197d605c-8b0a-4d0c-8229-cd0e28a78762.js — 200 — 17.8 KiB — 17 ms — h2https://sciencedaily.com/fonts/fontawesome-webfont.woff?v=4.2.0/fonts/fontawesome-webfont.woff?v=4... https://sciencedaily.com/fonts/fontawesome-webfont.woff?v=4.2.0 — 200 — 64.3 KiB — 13 ms — h2https://securepubads.g.doubleclick.net/tag/js/gpt.jssecurepubads.g.doubleclick.net/tag/... https://securepubads.g.doubleclick.net/tag/js/gpt.js — 200 — 34.0 KiB — 45 ms — h3https://scripts.pubnation.com/flooring/countryLookupscripts.pubnation.com/flooring/coun... https://scripts.pubnation.com/flooring/countryLookup — 200 — 187 B — 11 ms — h2https://scripts.pubnation.com/launcher/settings.json?off=pubnationscripts.pubnation.com/launcher/sett... https://scripts.pubnation.com/launcher/settings.json?off=pubnation — 200 — 3.5 KiB — 11 ms — h2https://keywords.pubnation.com/keyword?pageUrl=https://www.sciencedaily.com/keywords.pubnation.com/keyword?page... https://keywords.pubnation.com/keyword?pageUrl=https://www.sciencedaily.com/ — 204 — 0 B — 22 ms — h2https://scripts.pubnation.com/tags/3.44.9__cgroup3.44.10-3774-eids.1/wrapper.min.js?bust=-2082758458scripts.pubnation.com/tags/3.44.9__... https://scripts.pubnation.com/tags/3.44.9__cgroup3.44.10-3774-eids.1/wrapper.min.js?bust=-2082758458 — 200 — 78.2 KiB — 19 ms — h2https://exchange.pubnation.com/usersync.min.js?s2sVersion=productionexchange.pubnation.com/usersync.min... https://exchange.pubnation.com/usersync.min.js?s2sVersion=production — 200 — 5.3 KiB — 40 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
60% of JavaScript execution is third-party
First-party Third-party 270ms · 199KB · €3/mo
Google Tag Manager
Tag Manager
Optional
Execution 82ms
Transfer 161 KB
Unused 40%
Monthly Cost €1/mo
eu-us-cdn.consentmanager.net
Other
Optional
Execution 73ms
Transfer 29 KB
Monthly Cost €1/mo
Unattributable
Other
Optional
Execution 62ms
Transfer 0 KB
Monthly Cost €1/mo
scripts.pubnation.com
Other
Optional
Execution 54ms
Transfer 9 KB
Monthly Cost €1/mo

60% 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

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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