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Performance

· 15 checks — Lighthouse + waterfall + sustainability rolled into one auditable list.
SCORE
76
GRADE
C
FIX
4
REVIEW
2
PASS
7
INFO
2

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

Mobile Desktop
77
Performance Overall performance score (0–100) based on Core Web Vitals and other metrics. 90+ is good.
70
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.

1.52 s

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

2.69 s

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

12 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.

1.86 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.

2.69 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 2 REVIEW 4 FIX
F
Page Weight Budget
Action
14.8 MB transferred, 113 requests
FIX
14.8 MB transferred, 113 requests
Critical::
Page weighs 15.4 MB (14.8 MB transferred)
Warning::
Images are 14.2 MB — compress or use modern formats
Convert images to WebP/AVIF and resize to display dimensions to reduce transfer size.
Got: 14.2 MB
Info::
Fonts are 534 KB — consider subsetting or using system fonts
Subset fonts to include only used characters, or switch to system font stacks.
Got: 534 KB
Warning::
113 HTTP requests — consider bundling or reducing
Each request adds latency. Bundle small files, use sprites, or eliminate unnecessary requests.
Info::
Estimated 3.1 g CO2 per page load
14.8 MB / 2.4 MB budget
14.8 MB transferred
113 requests
3.1 g CO2 per page load
Images 14.2 MiB 95%
Fonts 533.7 KiB 4%
JavaScript 85.8 KiB 1%
CSS 57.4 KiB 0%
Other 10.0 KiB 0%
HTML 8.2 KiB 0%
Other 770 B 0%
Other 214 B 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

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

Each request adds latency. Bundle small files, use sprites, or eliminate unnecessary requests.

Why this matters

High HTTP request count — bundling, sprite-ing, and HTTP/2 server push can reduce per-request overhead.

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 (14.8 MiB of 14.8 MiB)
Info::
Third-party blocking time is low (0 ms)
100%
First-party Third-party
D
Page Weight Inventory
Action
113 resources · 14.8 MB · 0 KB savings available
FIX
113 resources · 14.8 MB · 0 KB savings available
Warning::
Page weight 13.8 MB over 1MB target
Got: 14.8 MB Expected: ≤ 1 MB
Warning::
112 third-party resources (100% of weight)
Info::
10 resources over 200KB
113 resources · 14.8 MiB · 112 third-party 13.8 MiB over 1MB target
Image 95% · 14.2 MiB
Font 4% · 533.7 KiB
JavaScript 1% · 85.8 KiB
CSS 0% · 57.4 KiB
Document 0% · 18.3 KiB
Other 0% · 214 B
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.

C
Image Optimization
Action
95 images, 0 KB saveable
REVIEW
95 images, 0 KB saveable
Warning::
https://www.esa.int/extension/pillars/design/pilla... is missing width/height — may cause layout shift
Set explicit width and height to prevent CLS.
Warning::
https://www.esa.int/extension/pillars/design/pilla... is missing width/height — may cause layout shift
Set explicit width and height to prevent CLS.
Warning::
https://www.esa.int/extension/pillars/design/pilla... is missing width/height — may cause layout shift
Set explicit width and height to prevent CLS.
Warning::
https://www.esa.int/extension/pillars/design/pilla... is missing width/height — may cause layout shift
Set explicit width and height to prevent CLS.
Warning::
https://www.esa.int/extension/pillars/design/pilla... is missing width/height — may cause layout shift
Set explicit width and height to prevent CLS.
Warning::
https://www.esa.int/extension/pillars/design/pilla... is missing width/height — may cause layout shift
Set explicit width and height to prevent CLS.
Warning::
https://www.esa.int/extension/pillars/design/pilla... is missing width/height — may cause layout shift
Set explicit width and height to prevent CLS.
Warning::
https://www.esa.int/extension/pillars/design/pilla... is missing width/height — may cause layout shift
Set explicit width and height to prevent CLS.
Warning::
https://www.esa.int/extension/pillars/design/pilla... is missing width/height — may cause layout shift
Set explicit width and height to prevent CLS.
Warning::
https://www.esa.int/extension/pillars/design/pilla... is missing width/height — may cause layout shift
Set explicit width and height to prevent CLS.
Warning::
https://www.esa.int/extension/pillars/design/pilla... is missing width/height — may cause layout shift
Set explicit width and height to prevent CLS.
Warning::
https://www.esa.int/extension/pillars/design/pilla... is missing width/height — may cause layout shift
Set explicit width and height to prevent CLS.
Warning::
https://www.esa.int/extension/pillars/design/pilla... is missing width/height — may cause layout shift
Set explicit width and height to prevent CLS.
Warning::
https://www.esa.int/extension/pillars/design/pilla... is missing width/height — may cause layout shift
Set explicit width and height to prevent CLS.
Warning::
https://www.esa.int/extension/pillars/design/pilla... is missing width/height — may cause layout shift
Set explicit width and height to prevent CLS.
Warning::
https://www.esa.int/extension/pillars/design/pilla... is missing width/height — may cause layout shift
Set explicit width and height to prevent CLS.
Warning::
https://www.esa.int/extension/pillars/design/pilla... is missing width/height — may cause layout shift
Set explicit width and height to prevent CLS.
Warning::
https://www.esa.int/extension/pillars/design/pilla... is missing width/height — may cause layout shift
Set explicit width and height to prevent CLS.
Warning::
https://www.esa.int/extension/pillars/design/pilla... is missing width/height — may cause layout shift
Set explicit width and height to prevent CLS.
Warning::
https://www.esa.int/extension/pillars/design/pilla... is missing width/height — may cause layout shift
Set explicit width and height to prevent CLS.
Warning::
https://www.esa.int/extension/pillars/design/pilla... is missing width/height — may cause layout shift
Set explicit width and height to prevent CLS.
Warning::
https://www.esa.int/extension/pillars/design/pilla... is missing width/height — may cause layout shift
Set explicit width and height to prevent CLS.
Warning::
https://www.esa.int/extension/pillars/design/pilla... is missing width/height — may cause layout shift
Set explicit width and height to prevent CLS.
Warning::
https://www.esa.int/extension/pillars/design/pilla... is missing width/height — may cause layout shift
Set explicit width and height to prevent CLS.
Warning::
https://www.esa.int/extension/pillars/design/pilla... is missing width/height — may cause layout shift
Set explicit width and height to prevent CLS.
Warning::
https://www.esa.int/extension/pillars/design/pilla... is missing width/height — may cause layout shift
Set explicit width and height to prevent CLS.
Warning::
https://www.esa.int/extension/pillars/design/pilla... is missing width/height — may cause layout shift
Set explicit width and height to prevent CLS.
95 images 14.2 MB
0 oversized -0 KB
95 legacy format
27 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

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

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

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

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

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
637ms total JS execution
REVIEW
637ms total JS execution
Warning::
Unattributable: 250ms CPU time
Info::
https://code.jquery.com/jquery-2.2.4.min.js: 236ms CPU time
Info::
https://www.esa.int/: 150ms CPU time
Warning::
Third-party scripts: 637ms (100% of total)

Main Thread Breakdown

Other 52% Style & Layout 22% Script Evaluation 15% Parse HTML & CSS 5% Rendering 4%
ScriptTotalScriptingParse/CompileParty
Unattributable250ms5ms0ms3rd
https://code.jquery.com/jquery-2.2.4.min.js236ms78ms3ms3rd
https://www.esa.int/150ms3ms0ms3rd
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
6 fonts (534 KB)
PASS
6 fonts (534 KB)
Info::
6 font(s) use font-display: swap (FOUT risk but functional)

Web fonts

6

534 KB total

Render-blocking

0

of 6

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 2.0 s 2.5 s FCP 1.5 s LCP 2.7 shttps://www.esa.int/extension/pillars/design/pillars/stylesheets/fonts/NotesESAbold.woffNotesESAbold.woff https://www.esa.int/extension/pillars/design/pillars/stylesheets/fonts/NotesESAbold.woff — 47.3 KiB — 53 ms — font-display: swaphttps://www.esa.int/extension/pillars/design/pillars/stylesheets/fonts/NotesStyle.woffNotesStyle.woff https://www.esa.int/extension/pillars/design/pillars/stylesheets/fonts/NotesStyle.woff — 22.3 KiB — 50 ms — font-display: swaphttps://www.esa.int/extension/pillars/design/pillars/stylesheets/fonts/NotesESAregular.woffNotesESAregular.woff https://www.esa.int/extension/pillars/design/pillars/stylesheets/fonts/NotesESAregular.woff — 26.0 KiB — 53 ms — font-display: swaphttps://www.esa.int/fontawesome/webfonts/fa-brands-400.woff2fa-brands-400.woff2 https://www.esa.int/fontawesome/webfonts/fa-brands-400.woff2 — 116.1 KiB — 55 ms — font-display: swaphttps://www.esa.int/extension/pillars/design/pillars/stylesheets/fonts/flexslider-icon.woffflexslider-icon.woff https://www.esa.int/extension/pillars/design/pillars/stylesheets/fonts/flexslider-icon.woff — 1.4 KiB — 50 ms — font-display: swaphttps://www.esa.int/fontawesome/webfonts/fa-solid-900.woff2fa-solid-900.woff2 https://www.esa.int/fontawesome/webfonts/fa-solid-900.woff2 — 320.5 KiB — 183 ms — font-display: swap
NotesESAbold.woff woff swap
Size 47 KB
Load time 53 ms
Start 1.1 s
Risk FOUT — text flashes from fallback to web font
  • Convert to woff2 for ~30% smaller file size
NotesStyle.woff woff swap
Size 22 KB
Load time 50 ms
Start 1.1 s
Risk FOUT — text flashes from fallback to web font
  • Convert to woff2 for ~30% smaller file size
NotesESAregular.woff woff swap
Size 26 KB
Load time 53 ms
Start 1.1 s
Risk FOUT — text flashes from fallback to web font
  • Convert to woff2 for ~30% smaller file size
fa-brands-400.woff2 woff2 swap
Size 116 KB
Load time 55 ms
Start 1.1 s
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
flexslider-icon.woff woff swap
Size 1 KB
Load time 50 ms
Start 1.1 s
Risk FOUT — text flashes from fallback to web font
  • Convert to woff2 for ~30% smaller file size
fa-solid-900.woff2 woff2 swap
Size 321 KB
Load time 183 ms
Start 1.3 s
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 ~247 KB and ~494 ms

A+
JS Bundles
3 scripts, 0 KB unused
PASS
3 scripts, 0 KB unused
0 KB unused JavaScript

Downloaded but never executed on this page.

ScriptSizeUnusedMinifiedParty
https://code.jquery.com/jquery-2.2.4.min.js29 KB—✓3rd
https://www.esa.int/var/esa/cache/public/javascript/ec3756e8a47adc0f64e3c43418bca85a_1729093166.js36 KB—✓3rd
https://www-analytics.esa.int/matomo.js21 KB—✓3rd
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: OVHcloud

Network Waterfall
113 requests over 2358ms
INFO
0 ms 500 ms 1.0 s 1.5 s 2.0 s 2.5 s FCP 1.5 s LCP 2.7 shttps://esa.int// https://esa.int/ — 301 — 94 B — 838 ms — h2https://www.esa.int/www.esa.int/ https://www.esa.int/ — 200 — 8.2 KiB — 23 ms — h2https://www.esa.int/var/esa/cache/public/stylesheets/c35b41a32fb01cc5cc5a0efcc8ca483e_1769593272_all.csswww.esa.int/var/esa/cache/public/st... https://www.esa.int/var/esa/cache/public/stylesheets/c35b41a32fb01cc5cc5a0efcc8ca483e_1769593272_all.css — 200 — 14.8 KiB — 12 ms — h2https://www.esa.int/fontawesome/css/fontawesome.csswww.esa.int/fontawesome/css/fontawe... https://www.esa.int/fontawesome/css/fontawesome.css — 200 — 37.3 KiB — 26 ms — h2https://www.esa.int/fontawesome/css/brands.csswww.esa.int/fontawesome/css/brands.... https://www.esa.int/fontawesome/css/brands.css — 200 — 4.9 KiB — 23 ms — h2https://www.esa.int/fontawesome/css/solid.csswww.esa.int/fontawesome/css/solid.c... https://www.esa.int/fontawesome/css/solid.css — 200 — 463 B — 13 ms — h2https://code.jquery.com/jquery-2.2.4.min.jscode.jquery.com/jquery-2.2.4.min.js https://code.jquery.com/jquery-2.2.4.min.js — 200 — 29.5 KiB — 31 ms — h2https://www.esa.int/var/esa/cache/public/javascript/ec3756e8a47adc0f64e3c43418bca85a_1729093166.jswww.esa.int/var/esa/cache/public/ja... https://www.esa.int/var/esa/cache/public/javascript/ec3756e8a47adc0f64e3c43418bca85a_1729093166.js — 200 — 35.5 KiB — 25 ms — h2https://www.esa.int/extension/pillars/design/pillars/images/ESA_Menu.svgwww.esa.int/extension/pillars/desig... https://www.esa.int/extension/pillars/design/pillars/images/ESA_Menu.svg — 200 — 399 B — 24 ms — h2https://www.esa.int/extension/pillars/design/pillars/images/ESA_Search.svgwww.esa.int/extension/pillars/desig... https://www.esa.int/extension/pillars/design/pillars/images/ESA_Search.svg — 200 — 516 B — 22 ms — h2https://www.esa.int/extension/pillars/design/pillars/images/ESA_Title.svgwww.esa.int/extension/pillars/desig... https://www.esa.int/extension/pillars/design/pillars/images/ESA_Title.svg — 200 — 1.9 KiB — 7 ms — h2https://www.esa.int/extension/pillars/design/pillars/images/ESA_Logo.svgwww.esa.int/extension/pillars/desig... https://www.esa.int/extension/pillars/design/pillars/images/ESA_Logo.svg — 200 — 1.5 KiB — 9 ms — h2https://www.esa.int/extension/pillars/design/pillars/images/arrow.svgwww.esa.int/extension/pillars/desig... https://www.esa.int/extension/pillars/design/pillars/images/arrow.svg — 200 — 393 B — 5 ms — h2https://www.esa.int/var/esa/storage/images/esa_multimedia/images/2026/04/trifid_nebula_wide_field_camera_3_image/27208638-1-eng-GB/Trifid_Nebula_Wide_Field_Camera_3_Image_pillars.jpgwww.esa.int/var/esa/storage/images/... https://www.esa.int/var/esa/storage/images/esa_multimedia/images/2026/04/trifid_nebula_wide_field_camera_3_image/27208638-1-eng-GB/Trifid_Nebula_Wide_Field_Camera_3_Image_pillars.jpg — 200 — 559.0 KiB — 28 ms — h2https://www.esa.int/var/esa/storage/images/esa_multimedia/images/2026/04/mtg-i2_flex_and_sentinel-3c_on_show_at_tas_cleanrooms/27207480-1-eng-GB/MTG-I2_FLEX_and_Sentinel-3C_on_show_at_TAS_cleanrooms_pillars.jpgwww.esa.int/var/esa/storage/images/... https://www.esa.int/var/esa/storage/images/esa_multimedia/images/2026/04/mtg-i2_flex_and_sentinel-3c_on_show_at_tas_cleanrooms/27207480-1-eng-GB/MTG-I2_FLEX_and_Sentinel-3C_on_show_at_TAS_cleanrooms_pillars.jpg — 200 — 973.0 KiB — 72 ms — h2https://www.esa.int/var/esa/storage/images/esa_multimedia/images/2026/04/a_fiery_cloud_at_sunset/27207966-1-eng-GB/A_fiery_cloud_at_sunset_pillars.jpgwww.esa.int/var/esa/storage/images/... https://www.esa.int/var/esa/storage/images/esa_multimedia/images/2026/04/a_fiery_cloud_at_sunset/27207966-1-eng-GB/A_fiery_cloud_at_sunset_pillars.jpg — 200 — 350.3 KiB — 82 ms — h2https://www.esa.int/var/esa/storage/images/esa_multimedia/images/2026/03/esa_recruits/27156189-1-eng-GB/ESA_recruits_pillars.jpgwww.esa.int/var/esa/storage/images/... https://www.esa.int/var/esa/storage/images/esa_multimedia/images/2026/03/esa_recruits/27156189-1-eng-GB/ESA_recruits_pillars.jpg — 200 — 79.2 KiB — 50 ms — h2https://www.esa.int/var/esa/storage/images/esa_multimedia/images/2026/01/epsilon_website/27067642-5-eng-GB/Epsilon_website_card_full.jpgwww.esa.int/var/esa/storage/images/... https://www.esa.int/var/esa/storage/images/esa_multimedia/images/2026/01/epsilon_website/27067642-5-eng-GB/Epsilon_website_card_full.jpg — 200 — 97.4 KiB — 98 ms — h2https://www.esa.int/extension/pillars/design/pillars/images/arrow-white.svgwww.esa.int/extension/pillars/desig... https://www.esa.int/extension/pillars/design/pillars/images/arrow-white.svg — 200 — 522 B — 44 ms — h2https://www.esa.int/var/esa/storage/images/esa_multimedia/images/2025/03/strong_gravitational_lenses_captured_by_euclid/26615081-1-eng-GB/Strong_gravitational_lenses_captured_by_Euclid_card_medium.jpgwww.esa.int/var/esa/storage/images/... https://www.esa.int/var/esa/storage/images/esa_multimedia/images/2025/03/strong_gravitational_lenses_captured_by_euclid/26615081-1-eng-GB/Strong_gravitational_lenses_captured_by_Euclid_card_medium.jpg — 200 — 34.7 KiB — 49 ms — h2https://www.esa.int/var/esa/storage/images/esa_multimedia/images/2026/04/earth_from_space_land_of_rainforests/27206990-1-eng-GB/Earth_from_Space_Land_of_rainforests_card_full.jpgwww.esa.int/var/esa/storage/images/... https://www.esa.int/var/esa/storage/images/esa_multimedia/images/2026/04/earth_from_space_land_of_rainforests/27206990-1-eng-GB/Earth_from_Space_Land_of_rainforests_card_full.jpg — 200 — 65.5 KiB — 93 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
100% of JavaScript execution is third-party
First-party Third-party 637ms · 38KB · €7/mo
Unattributable
Other
Costly
Execution 250ms
Transfer 0 KB
Monthly Cost €3/mo
code.jquery.com
Other
Costly
Execution 236ms
Transfer 29 KB
Monthly Cost €3/mo
www.esa.int
Other
Optional
Execution 150ms
Transfer 8 KB
Monthly Cost €2/mo

These scripts may cost more than they're worth

  • Unattributable adds 250ms and costs ~€3/month
  • code.jquery.com adds 236ms and costs ~€3/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 250ms 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

code.jquery.com takes 236ms 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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