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https://universetoday.com

Performance

· 17 checks — Lighthouse + waterfall + sustainability rolled into one auditable list.
SCORE
79
GRADE
C
FIX
4
REVIEW
2
PASS
9
INFO
2

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

Mobile Desktop
95
Performance Overall performance score (0–100) based on Core Web Vitals and other metrics. 90+ is good.
91
Accessibility Measures how accessible the page is for users with disabilities. Checks color contrast, ARIA labels, and semantic HTML.
96
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.

1.75 s

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

2.80 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.

2.49 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.

2.80 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 2 REVIEW 4 FIX
F
Page Weight Budget
Action
14.0 MB transferred, 25 requests
FIX
14.0 MB transferred, 25 requests
Critical::
Page weighs 14.0 MB (14.0 MB transferred)
Warning::
Images are 14.0 MB — compress or use modern formats
Convert images to WebP/AVIF and resize to display dimensions to reduce transfer size.
Got: 14.0 MB
Info::
25 HTTP requests
Info::
Estimated 2.9 g CO2 per page load
14.0 MB / 2.4 MB budget
14.0 MB transferred
25 requests
2.9 g CO2 per page load
Images 14.0 MiB 100%
HTML 8.6 KiB 0%
CSS 8.0 KiB 0%
Other 2.1 KiB 0%
0 2.4 MB 4.9 MB
Over budget

Convert images to WebP/AVIF and resize to display dimensions to reduce transfer size.

Why this matters

Image bandwidth is high — modern formats (WebP/AVIF) and resizing typically cut it 50%+.

Source: web.dev

D
Third-Party Impact
Action
100% third-party, 0 ms blocking
FIX
100% third-party, 0 ms blocking
Warning::
Third-party code accounts for 100% of page weight (14.0 MiB of 14.0 MiB)
Info::
Third-party blocking time is low (0 ms)
100%
First-party Third-party
D
Page Weight Inventory
Action
25 resources · 14.0 MB · 0 KB savings available
FIX
25 resources · 14.0 MB · 0 KB savings available
Warning::
Page weight 13.0 MB over 1MB target
Got: 14.0 MB Expected: ≤ 1 MB
Warning::
24 third-party resources (100% of weight)
Info::
6 resources over 200KB
25 resources · 14.0 MiB · 24 third-party 13.0 MiB over 1MB target
Image 100% · 14.0 MiB
Document 0% · 9.0 KiB
CSS 0% · 8.0 KiB
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.

No Cache-Control header

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

B
Image Optimization
21 images, 0 KB saveable
REVIEW
21 images, 0 KB saveable
Warning::
https://www.universetoday.com/assets/ut-website-lo... is missing width/height — may cause layout shift
Set explicit width and height to prevent CLS.
21 images 14.0 MB
0 oversized -0 KB
3 legacy format
1 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

C
JS Execution Cost
Action
1028ms total JS execution
REVIEW
1028ms total JS execution
Warning::
Unattributable: 594ms CPU time
Warning::
https://www.universetoday.com/: 434ms CPU time
Warning::
Third-party scripts: 1028ms (100% of total)

Main Thread Breakdown

Other 65% Style & Layout 27% Rendering 4%
ScriptTotalScriptingParse/CompileParty
Unattributable594ms9ms0ms3rd
https://www.universetoday.com/434ms6ms1ms3rd
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
No web fonts (system fonts)
PASS
No web fonts (system fonts)
Info::
No web fonts loaded — system fonts are fastest
No web fonts loaded — system fonts are optimal.
A+
JS Bundles
No JavaScript
PASS
No JavaScript
Info::
No JavaScript bundles
No JavaScript files loaded.
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

Network Waterfall
25 requests over 798ms
INFO
0 ms 500 ms 1.0 s 1.5 s 2.0 s 2.5 s FCP 1.8 s LCP 2.8 shttps://universetoday.com// https://universetoday.com/ — 301 — 403 B — 103 ms — h2https://www.universetoday.com/www.universetoday.com/ https://www.universetoday.com/ — 200 — 8.6 KiB — 16 ms — h2https://www.universetoday.com/css/site.csswww.universetoday.com/css/site.css https://www.universetoday.com/css/site.css — 200 — 8.0 KiB — 21 ms — h2https://www.universetoday.com/assets/ut-website-logo-100.pngwww.universetoday.com/assets/ut-web... https://www.universetoday.com/assets/ut-website-logo-100.png — 200 — 3.4 KiB — 12 ms — h2https://www.universetoday.com/article_images/E2-PIA23139-Landscape_showing_clay_region.width-1320_20260422_174258.jpgwww.universetoday.com/article_image... https://www.universetoday.com/article_images/E2-PIA23139-Landscape_showing_clay_region.width-1320_20260422_174258.jpg — 200 — 66.8 KiB — 22 ms — h2https://www.universetoday.com/article_images/2000x1936_20260421_215313.jpgwww.universetoday.com/article_image... https://www.universetoday.com/article_images/2000x1936_20260421_215313.jpg — 200 — 58.6 KiB — 21 ms — h2https://www.universetoday.com/article_images/Screenshot_2026-04-21_115947_20260421_160306.jpgwww.universetoday.com/article_image... https://www.universetoday.com/article_images/Screenshot_2026-04-21_115947_20260421_160306.jpg — 200 — 14.9 KiB — 23 ms — h2https://www.universetoday.com/article_images/cropped_750_20260422_033917.jpgwww.universetoday.com/article_image... https://www.universetoday.com/article_images/cropped_750_20260422_033917.jpg — 200 — 64.9 KiB — 35 ms — h2https://www.universetoday.com/article_images/20260410-aurora_over_Engaru_Tomohiro_M._Nakayama-cropped_CC-BY-NC_1_20260421_202728.jpgwww.universetoday.com/article_image... https://www.universetoday.com/article_images/20260410-aurora_over_Engaru_Tomohiro_M._Nakayama-cropped_CC-BY-NC_1_20260421_202728.jpg — 200 — 345.6 KiB — 39 ms — h2https://www.universetoday.com/article_images/Dyson_Sphere_Render_20260421_182639.jpgwww.universetoday.com/article_image... https://www.universetoday.com/article_images/Dyson_Sphere_Render_20260421_182639.jpg — 200 — 61.3 KiB — 23 ms — h2https://www.universetoday.com/article_images/71c82f068a49433b982e66d7e7a0c321_20260421_121704.pngwww.universetoday.com/article_image... https://www.universetoday.com/article_images/71c82f068a49433b982e66d7e7a0c321_20260421_121704.png — 200 — 26.4 KiB — 25 ms — h2https://www.universetoday.com/article_images/original1_20260421_000525.gifwww.universetoday.com/article_image... https://www.universetoday.com/article_images/original1_20260421_000525.gif — 200 — 11.7 MiB — 605 ms — h2https://www.universetoday.com/article_images/JPL-Presentation_v3_20260420_180829.jpgwww.universetoday.com/article_image... https://www.universetoday.com/article_images/JPL-Presentation_v3_20260420_180829.jpg — 200 — 21.6 KiB — 28 ms — h2https://www.universetoday.com/article_images/noao-cyg_x1_20260420_145949.jpgwww.universetoday.com/article_image... https://www.universetoday.com/article_images/noao-cyg_x1_20260420_145949.jpg — 200 — 370.9 KiB — 90 ms — h2https://www.universetoday.com/article_images/noirlab2608a_20260419_203702.jpegwww.universetoday.com/article_image... https://www.universetoday.com/article_images/noirlab2608a_20260419_203702.jpeg — 200 — 275.1 KiB — 149 ms — h2https://www.universetoday.com/article_images/icecube_neutrino_observatory_20260412_014733.jpgwww.universetoday.com/article_image... https://www.universetoday.com/article_images/icecube_neutrino_observatory_20260412_014733.jpg — 200 — 44.9 KiB — 133 ms — h2https://www.universetoday.com/article_images/viper_cdr_hero_08_lrg_20260418_224411.jpegwww.universetoday.com/article_image... https://www.universetoday.com/article_images/viper_cdr_hero_08_lrg_20260418_224411.jpeg — 200 — 78.2 KiB — 146 ms — h2https://www.universetoday.com/article_images/advanced_test_reactor_20260412_014326.jpgwww.universetoday.com/article_image... https://www.universetoday.com/article_images/advanced_test_reactor_20260412_014326.jpg — 200 — 16.8 KiB — 140 ms — h2https://www.universetoday.com/article_images/fig1-13-1078x516_20260417_205916.jpgwww.universetoday.com/article_image... https://www.universetoday.com/article_images/fig1-13-1078x516_20260417_205916.jpg — 200 — 55.0 KiB — 76 ms — h2https://www.universetoday.com/article_images/lucy-spacecraft-trojan-asteroid_20260417_184712.webpwww.universetoday.com/article_image... https://www.universetoday.com/article_images/lucy-spacecraft-trojan-asteroid_20260417_184712.webp — 200 — 318.8 KiB — 89 ms — h2https://www.universetoday.com/article_images/image_6258_1-Mars-Terraforming_20260416_203842.jpgwww.universetoday.com/article_image... https://www.universetoday.com/article_images/image_6258_1-Mars-Terraforming_20260416_203842.jpg — 200 — 75.7 KiB — 82 ms — h2https://www.universetoday.com/article_images/Eliot_20260417_145022.jpgwww.universetoday.com/article_image... https://www.universetoday.com/article_images/Eliot_20260417_145022.jpg — 200 — 214.5 KiB — 100 ms — h2https://www.universetoday.com/article_images/space-worms-for-web_20260417_115717.jpgwww.universetoday.com/article_image... https://www.universetoday.com/article_images/space-worms-for-web_20260417_115717.jpg — 200 — 5.8 KiB — 93 ms — h2https://www.universetoday.com/article_images/Mars_Express_captures_dark_ash_covering_Mars_s_Utopia_Planitia_pillars_20260417_105515.jpgwww.universetoday.com/article_image... https://www.universetoday.com/article_images/Mars_Express_captures_dark_ash_covering_Mars_s_Utopia_Planitia_pillars_20260417_105515.jpg — 200 — 175.8 KiB — 115 ms — h2https://www.universetoday.com/favicon.icowww.universetoday.com/favicon.ico https://www.universetoday.com/favicon.ico — 200 — 1.7 KiB — 10 ms — h2
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 1028ms · 9KB · €11/mo
Unattributable
Other
Costly
Execution 594ms
Transfer 0 KB
Monthly Cost €6/mo
www.universetoday.com
Other
Costly
Execution 434ms
Transfer 9 KB
Monthly Cost €5/mo

These scripts may cost more than they're worth

  • Unattributable adds 594ms and costs ~€6/month
  • www.universetoday.com adds 434ms and costs ~€5/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 594ms 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.universetoday.com takes 434ms 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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