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Performance

· 15 checks — Lighthouse + waterfall + sustainability rolled into one auditable list.
SCORE
81
GRADE
B
FIX
4
REVIEW
1
PASS
8
INFO
2

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

Mobile Desktop
86
Performance Overall performance score (0–100) based on Core Web Vitals and other metrics. 90+ is good.
89
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.
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.

679 ms

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

2.48 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.

0.035

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

825 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.

2.53 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
15
8 PASS 1 REVIEW 4 FIX
F
Page Weight Budget
Action
2.8 MB transferred, 44 requests
FIX
2.8 MB transferred, 44 requests
Warning::
Page weighs 4.0 MB (2.8 MB transferred)
Warning::
Images are 2.2 MB — compress or use modern formats
Convert images to WebP/AVIF and resize to display dimensions to reduce transfer size.
Got: 2.2 MB
Info::
Fonts are 440 KB — consider subsetting or using system fonts
Subset fonts to include only used characters, or switch to system font stacks.
Got: 440 KB
Info::
44 HTTP requests
Info::
Estimated 0.59 g CO2 per page load
2.8 MB / 2.4 MB budget
2.8 MB transferred
44 requests
0.59 g CO2 per page load
Images 2.2 MiB 78%
Fonts 440.4 KiB 15%
JavaScript 96.4 KiB 3%
CSS 79.7 KiB 3%
HTML 21.2 KiB 1%
Other 2.0 KiB 0%
Other 220 B 0%
Other 151 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

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 (2.8 MiB of 2.8 MiB)
Info::
Third-party blocking time is low (0 ms)
100%
First-party Third-party
D
Page Weight Inventory
Action
44 resources · 2.8 MB · 34 KB savings available
FIX
44 resources · 2.8 MB · 34 KB savings available
Warning::
Page weight 1.8 MB over 1MB target
Got: 2.8 MB Expected: ≤ 1 MB
Warning::
43 third-party resources (100% of weight)
Info::
2 resources over 200KB
44 resources · 2.8 MiB · 43 third-party 1.8 MiB over 1MB target
Image 78% · 2.2 MiB
Font 15% · 440.4 KiB
JavaScript 3% · 96.4 KiB
CSS 3% · 79.7 KiB
Document 1% · 21.4 KiB
Other 0% · 371 B

~33.7 KiB of savings available

Remove unused JavaScript: 33.7 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.

C
Image Optimization
Action
28 images, 0 KB saveable
REVIEW
28 images, 0 KB saveable
Warning::
https://www.blender.org/wp-content/uploads/2019/07... is missing width/height — may cause layout shift
Set explicit width and height to prevent CLS.
Warning::
https://www.blender.org/wp-content/uploads/2019/07... is missing width/height — may cause layout shift
Set explicit width and height to prevent CLS.
Warning::
https://www.blender.org/wp-content/uploads/2019/07... is missing width/height — may cause layout shift
Set explicit width and height to prevent CLS.
Warning::
https://www.blender.org/wp-content/uploads/2019/07... is missing width/height — may cause layout shift
Set explicit width and height to prevent CLS.
Warning::
https://www.blender.org/wp-content/uploads/2019/07... is missing width/height — may cause layout shift
Set explicit width and height to prevent CLS.
Warning::
https://www.blender.org/wp-content/uploads/2019/07... is missing width/height — may cause layout shift
Set explicit width and height to prevent CLS.
28 images 2.2 MB
0 oversized -0 KB
22 legacy format
6 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

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+
JS Execution Cost
182ms total JS execution
PASS
182ms total JS execution
Info::
https://www.blender.org/: 102ms CPU time
Info::
Unattributable: 80ms CPU time
Warning::
Third-party scripts: 182ms (100% of total)

Main Thread Breakdown

Style & Layout 38% Other 30% Script Evaluation 20% Parse HTML & CSS 6% Rendering 3%
ScriptTotalScriptingParse/CompileParty
https://www.blender.org/102ms2ms1ms3rd
Unattributable80ms15ms0ms3rd
A+
Font Loading
2 fonts (440 KB)
PASS
2 fonts (440 KB)
Info::
2 font(s) use font-display: swap (FOUT risk but functional)

Web fonts

2

440 KB total

Render-blocking

0

of 2

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 679 ms LCP 2.5 shttps://www.blender.org/wp-content/themes/bthree/assets/fonts/Inter-VariableFont_slnt,wght.ttfInter-VariableFont_slnt... https://www.blender.org/wp-content/themes/bthree/assets/fonts/Inter-VariableFont_slnt,wght.ttf — 412.3 KiB — 46 ms — font-display: swaphttps://www.blender.org/wp-content/themes/bthree/assets/fonts/fontutti.woff2?4c873d21fontutti.woff2 https://www.blender.org/wp-content/themes/bthree/assets/fonts/fontutti.woff2?4c873d21 — 28.1 KiB — 29 ms — font-display: swap
Inter-VariableFont_slnt... ttf swap
Size 412 KB
Load time 46 ms
Start 354 ms
Risk FOUT — text flashes from fallback to web font
  • Convert to woff2 for ~30% smaller file size
  • Subset this font — over 100 KB suggests Latin Extended or full glyph coverage that most pages don't need
fontutti.woff2 woff2 swap
Size 28 KB
Load time 29 ms
Start 358 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)

Fixing the unchecked items could save ~330 KB and ~660 ms

A+
JS Bundles
8 scripts, 34 KB unused
PASS
8 scripts, 34 KB unused
Warning::
https://www.blender.org/wp-content/themes/bthree/a...: 34 KB unused (73%)
Consider code splitting or tree shaking to reduce unused code.
Info::
Total unused JavaScript: 34 KB
34 KB unused JavaScript

Downloaded but never executed on this page.

ScriptSizeUnusedMinifiedParty
https://www.blender.org/wp-content/themes/bthree/assets/js/generated/tutti.min.js?x3495946 KB34 KB (73%)✓3rd
https://analytics.blender.org/js/pa-U2drbvocUhlojMlK4BOLL.js3 KB—✓3rd
https://static.cloudflareinsights.com/beacon.min.js/v8c78df7c7c0f484497ecbca7046644da177152312451611 KB—✓3rd
https://www.blender.org/wp-includes/js/dist/script-modules/block-library/image/view.min.js?x349592 KB—✓3rd
https://www.blender.org/wp-includes/js/dist/script-modules/interactivity/index.min.js?x3495915 KB—✓3rd
https://www.blender.org/wp-includes/js/dist/script-modules/interactivity/index.min.js?ver=66c613f68580994bb00a15 KB—✓3rd
blob:https://www.blender.org/653d4caf-0d25-4dad-91ce-845b4e8d0bf9-0 KB—✓3rd
https://www.blender.org/wp-includes/js/wp-emoji-release.min.js?ver=6.9.45 KB—✓3rd

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+
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
44 requests over 567ms
INFO
0 ms 500 ms 1.0 s 1.5 s 2.0 s 2.5 s FCP 679 ms LCP 2.5 shttps://blender.org// https://blender.org/ — 301 — 193 B — 146 ms — h2https://www.blender.org/www.blender.org/ https://www.blender.org/ — 200 — 21.2 KiB — 72 ms — h2https://www.blender.org/wp-content/themes/bthree/style.css?x34959www.blender.org/wp-content/themes/b... https://www.blender.org/wp-content/themes/bthree/style.css?x34959 — 200 — 79.7 KiB — 49 ms — h2https://analytics.blender.org/js/pa-U2drbvocUhlojMlK4BOLL.jsanalytics.blender.org/js/pa-U2drbvo... https://analytics.blender.org/js/pa-U2drbvocUhlojMlK4BOLL.js — 200 — 2.7 KiB — 96 ms — h2https://www.blender.org/wp-content/uploads/2026/01/bcon_austin_2026.pngwww.blender.org/wp-content/uploads/... https://www.blender.org/wp-content/uploads/2026/01/bcon_austin_2026.png — 200 — 149.9 KiB — 64 ms — h2https://www.blender.org/wp-content/uploads/2026/02/brc_poster_clean.jpgwww.blender.org/wp-content/uploads/... https://www.blender.org/wp-content/uploads/2026/02/brc_poster_clean.jpg — 200 — 220.7 KiB — 70 ms — h2https://www.blender.org/wp-content/uploads/2021/08/blender_fund_hex-e1629996297522.pngwww.blender.org/wp-content/uploads/... https://www.blender.org/wp-content/uploads/2021/08/blender_fund_hex-e1629996297522.png — 200 — 23.5 KiB — 43 ms — h2https://code.blender.org/wp-content/uploads/2026/02/winter_quality_2026-480x270.jpgcode.blender.org/wp-content/uploads... https://code.blender.org/wp-content/uploads/2026/02/winter_quality_2026-480x270.jpg — 200 — 14.0 KiB — 40 ms — h2https://code.blender.org/wp-content/uploads/2025/10/geometry_workshop_september_2025_thumbnail-480x270.pngcode.blender.org/wp-content/uploads... https://code.blender.org/wp-content/uploads/2025/10/geometry_workshop_september_2025_thumbnail-480x270.png — 200 — 124.1 KiB — 45 ms — h2https://code.blender.org/wp-content/uploads/2025/10/gsoc_2025-480x270.jpgcode.blender.org/wp-content/uploads... https://code.blender.org/wp-content/uploads/2025/10/gsoc_2025-480x270.jpg — 200 — 13.4 KiB — 40 ms — h2https://www.blender.org/wp-content/themes/bthree/assets/js/generated/tutti.min.js?x34959www.blender.org/wp-content/themes/b... https://www.blender.org/wp-content/themes/bthree/assets/js/generated/tutti.min.js?x34959 — 200 — 46.2 KiB — 32 ms — h2https://code.blender.org/wp-content/uploads/2025/10/volume_grids_thumbnail-480x270.pngcode.blender.org/wp-content/uploads... https://code.blender.org/wp-content/uploads/2025/10/volume_grids_thumbnail-480x270.png — 200 — 65.1 KiB — 37 ms — h2https://studio.blender.org/files/public/thumbnail/b9/0c/b90c5f218ca21f9a7465298fb3d0525b_s.webpstudio.blender.org/files/public/thu... https://studio.blender.org/files/public/thumbnail/b9/0c/b90c5f218ca21f9a7465298fb3d0525b_s.webp — 200 — 45.5 KiB — 97 ms — h2https://studio.blender.org/files/public/thumbnail/c9/b9/c9b990e4614c068ed156d41de68cf642_s.webpstudio.blender.org/files/public/thu... https://studio.blender.org/files/public/thumbnail/c9/b9/c9b990e4614c068ed156d41de68cf642_s.webp — 200 — 27.7 KiB — 75 ms — h2data:image/svg+xml;base64,PD94bWwgdmVyc2lvbj0iMS4wIiBlbmNvZGluZz0iVVRGLTgiIHN0YW5kYWxvbmU9Im5vIj8+C…data:image/svg+xml;base64,PD94bWwgd... data:image/svg+xml;base64,PD94bWwgdmVyc2lvbj0iMS4wIiBlbmNvZGluZz0iVVRGLTgiIHN0YW5kYWxvbmU9Im5vIj8+C… — 200 — 0 B — 0 ms — datahttps://www.blender.org/wp-content/uploads/2026/03/blender_51_artwork_cropped.webpwww.blender.org/wp-content/uploads/... https://www.blender.org/wp-content/uploads/2026/03/blender_51_artwork_cropped.webp — 200 — 176.3 KiB — 37 ms — h2https://studio.blender.org/files/public/thumbnail/92/ec/92ecaa98d33bb2b10e12051e2e6a986e_s.webpstudio.blender.org/files/public/thu... https://studio.blender.org/files/public/thumbnail/92/ec/92ecaa98d33bb2b10e12051e2e6a986e_s.webp — 200 — 54.8 KiB — 86 ms — h2https://studio.blender.org/files/public/thumbnail/c9/f4/c9f4a37cd2911fb079a563440d3bdc14-2_s.webpstudio.blender.org/files/public/thu... https://studio.blender.org/files/public/thumbnail/c9/f4/c9f4a37cd2911fb079a563440d3bdc14-2_s.webp — 200 — 51.0 KiB — 87 ms — h2https://www.blender.org/wp-content/uploads/2021/10/khronos.pngwww.blender.org/wp-content/uploads/... https://www.blender.org/wp-content/uploads/2021/10/khronos.png — 200 — 12.5 KiB — 31 ms — h2https://www.blender.org/wp-content/uploads/2021/10/linux_foundation.pngwww.blender.org/wp-content/uploads/... https://www.blender.org/wp-content/uploads/2021/10/linux_foundation.png — 200 — 10.6 KiB — 43 ms — h2https://www.blender.org/wp-content/uploads/2021/10/blender_today_pablo.jpgwww.blender.org/wp-content/uploads/... https://www.blender.org/wp-content/uploads/2021/10/blender_today_pablo.jpg — 200 — 82.5 KiB — 54 ms — h2https://www.blender.org/wp-content/uploads/2021/10/daniel_martinez_lara_annecy.jpgwww.blender.org/wp-content/uploads/... https://www.blender.org/wp-content/uploads/2021/10/daniel_martinez_lara_annecy.jpg — 200 — 52.9 KiB — 47 ms — h2https://www.blender.org/wp-content/uploads/2021/10/creating_worlds_ian_hubert.jpgwww.blender.org/wp-content/uploads/... https://www.blender.org/wp-content/uploads/2021/10/creating_worlds_ian_hubert.jpg — 200 — 45.4 KiB — 50 ms — h2https://www.blender.org/wp-content/uploads/2021/10/nodevember.jpgwww.blender.org/wp-content/uploads/... https://www.blender.org/wp-content/uploads/2021/10/nodevember.jpg — 200 — 66.8 KiB — 54 ms — h2https://www.blender.org/wp-content/uploads/2019/07/blender_render-1280x720.jpg?x12104www.blender.org/wp-content/uploads/... https://www.blender.org/wp-content/uploads/2019/07/blender_render-1280x720.jpg?x12104 — 200 — 135.9 KiB — 43 ms — h2https://www.blender.org/wp-content/themes/bthree/assets/fonts/Inter-VariableFont_slnt,wght.ttfwww.blender.org/wp-content/themes/b... https://www.blender.org/wp-content/themes/bthree/assets/fonts/Inter-VariableFont_slnt,wght.ttf — 200 — 412.3 KiB — 46 ms — h2https://static.cloudflareinsights.com/beacon.min.js/v8c78df7c7c0f484497ecbca7046644da1771523124516static.cloudflareinsights.com/beaco... https://static.cloudflareinsights.com/beacon.min.js/v8c78df7c7c0f484497ecbca7046644da1771523124516 — 200 — 10.7 KiB — 106 ms — h2https://www.blender.org/wp-content/themes/bthree/assets/fonts/fontutti.woff2?4c873d21www.blender.org/wp-content/themes/b... https://www.blender.org/wp-content/themes/bthree/assets/fonts/fontutti.woff2?4c873d21 — 200 — 28.1 KiB — 29 ms — h2https://www.blender.org/wp-content/uploads/2019/07/modeling02-1280x720.jpg?x12104www.blender.org/wp-content/uploads/... https://www.blender.org/wp-content/uploads/2019/07/modeling02-1280x720.jpg?x12104 — 200 — 140.1 KiB — 33 ms — h2https://www.blender.org/wp-content/uploads/2019/07/blender_vfx-1280x720.jpg?x12104www.blender.org/wp-content/uploads/... https://www.blender.org/wp-content/uploads/2019/07/blender_vfx-1280x720.jpg?x12104 — 200 — 136.5 KiB — 35 ms — h2
0 ms 500 ms 1.0 s 1.5 s 2.0 s 2.5 s FCP 679 ms LCP 2.5 shttps://blender.org// https://blender.org/ — 301 — 193 B — 146 ms — h2https://www.blender.org/www.blender.org/ https://www.blender.org/ — 200 — 21.2 KiB — 72 ms — h2https://www.blender.org/wp-content/themes/bthree/style.css?x34959www.blender.org/wp-content/themes/b... https://www.blender.org/wp-content/themes/bthree/style.css?x34959 — 200 — 79.7 KiB — 49 ms — h2https://analytics.blender.org/js/pa-U2drbvocUhlojMlK4BOLL.jsanalytics.blender.org/js/pa-U2drbvo... https://analytics.blender.org/js/pa-U2drbvocUhlojMlK4BOLL.js — 200 — 2.7 KiB — 96 ms — h2https://www.blender.org/wp-content/uploads/2026/01/bcon_austin_2026.pngwww.blender.org/wp-content/uploads/... https://www.blender.org/wp-content/uploads/2026/01/bcon_austin_2026.png — 200 — 149.9 KiB — 64 ms — h2https://www.blender.org/wp-content/uploads/2026/02/brc_poster_clean.jpgwww.blender.org/wp-content/uploads/... https://www.blender.org/wp-content/uploads/2026/02/brc_poster_clean.jpg — 200 — 220.7 KiB — 70 ms — h2https://www.blender.org/wp-content/uploads/2021/08/blender_fund_hex-e1629996297522.pngwww.blender.org/wp-content/uploads/... https://www.blender.org/wp-content/uploads/2021/08/blender_fund_hex-e1629996297522.png — 200 — 23.5 KiB — 43 ms — h2https://code.blender.org/wp-content/uploads/2026/02/winter_quality_2026-480x270.jpgcode.blender.org/wp-content/uploads... https://code.blender.org/wp-content/uploads/2026/02/winter_quality_2026-480x270.jpg — 200 — 14.0 KiB — 40 ms — h2https://code.blender.org/wp-content/uploads/2025/10/geometry_workshop_september_2025_thumbnail-480x270.pngcode.blender.org/wp-content/uploads... https://code.blender.org/wp-content/uploads/2025/10/geometry_workshop_september_2025_thumbnail-480x270.png — 200 — 124.1 KiB — 45 ms — h2https://code.blender.org/wp-content/uploads/2025/10/gsoc_2025-480x270.jpgcode.blender.org/wp-content/uploads... https://code.blender.org/wp-content/uploads/2025/10/gsoc_2025-480x270.jpg — 200 — 13.4 KiB — 40 ms — h2https://www.blender.org/wp-content/themes/bthree/assets/js/generated/tutti.min.js?x34959www.blender.org/wp-content/themes/b... https://www.blender.org/wp-content/themes/bthree/assets/js/generated/tutti.min.js?x34959 — 200 — 46.2 KiB — 32 ms — h2https://code.blender.org/wp-content/uploads/2025/10/volume_grids_thumbnail-480x270.pngcode.blender.org/wp-content/uploads... https://code.blender.org/wp-content/uploads/2025/10/volume_grids_thumbnail-480x270.png — 200 — 65.1 KiB — 37 ms — h2https://studio.blender.org/files/public/thumbnail/b9/0c/b90c5f218ca21f9a7465298fb3d0525b_s.webpstudio.blender.org/files/public/thu... https://studio.blender.org/files/public/thumbnail/b9/0c/b90c5f218ca21f9a7465298fb3d0525b_s.webp — 200 — 45.5 KiB — 97 ms — h2https://studio.blender.org/files/public/thumbnail/c9/b9/c9b990e4614c068ed156d41de68cf642_s.webpstudio.blender.org/files/public/thu... https://studio.blender.org/files/public/thumbnail/c9/b9/c9b990e4614c068ed156d41de68cf642_s.webp — 200 — 27.7 KiB — 75 ms — h2data:image/svg+xml;base64,PD94bWwgdmVyc2lvbj0iMS4wIiBlbmNvZGluZz0iVVRGLTgiIHN0YW5kYWxvbmU9Im5vIj8+C…data:image/svg+xml;base64,PD94bWwgd... data:image/svg+xml;base64,PD94bWwgdmVyc2lvbj0iMS4wIiBlbmNvZGluZz0iVVRGLTgiIHN0YW5kYWxvbmU9Im5vIj8+C… — 200 — 0 B — 0 ms — datahttps://www.blender.org/wp-content/uploads/2026/03/blender_51_artwork_cropped.webpwww.blender.org/wp-content/uploads/... https://www.blender.org/wp-content/uploads/2026/03/blender_51_artwork_cropped.webp — 200 — 176.3 KiB — 37 ms — h2https://studio.blender.org/files/public/thumbnail/92/ec/92ecaa98d33bb2b10e12051e2e6a986e_s.webpstudio.blender.org/files/public/thu... https://studio.blender.org/files/public/thumbnail/92/ec/92ecaa98d33bb2b10e12051e2e6a986e_s.webp — 200 — 54.8 KiB — 86 ms — h2https://studio.blender.org/files/public/thumbnail/c9/f4/c9f4a37cd2911fb079a563440d3bdc14-2_s.webpstudio.blender.org/files/public/thu... https://studio.blender.org/files/public/thumbnail/c9/f4/c9f4a37cd2911fb079a563440d3bdc14-2_s.webp — 200 — 51.0 KiB — 87 ms — h2https://www.blender.org/wp-content/uploads/2021/10/khronos.pngwww.blender.org/wp-content/uploads/... https://www.blender.org/wp-content/uploads/2021/10/khronos.png — 200 — 12.5 KiB — 31 ms — h2https://www.blender.org/wp-content/uploads/2021/10/linux_foundation.pngwww.blender.org/wp-content/uploads/... https://www.blender.org/wp-content/uploads/2021/10/linux_foundation.png — 200 — 10.6 KiB — 43 ms — h2https://www.blender.org/wp-content/uploads/2021/10/blender_today_pablo.jpgwww.blender.org/wp-content/uploads/... https://www.blender.org/wp-content/uploads/2021/10/blender_today_pablo.jpg — 200 — 82.5 KiB — 54 ms — 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h2https://www.blender.org/wp-content/themes/bthree/assets/icons/favicon.svgwww.blender.org/wp-content/themes/b... https://www.blender.org/wp-content/themes/bthree/assets/icons/favicon.svg — 200 — 1.8 KiB — 28 ms — h2https://www.blender.org/wp-includes/js/wp-emoji-release.min.js?ver=6.9.4www.blender.org/wp-includes/js/wp-e... https://www.blender.org/wp-includes/js/wp-emoji-release.min.js?ver=6.9.4 — 200 — 5.3 KiB — 29 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 182ms · 21KB · €2/mo
www.blender.org
Other
Optional
Execution 102ms
Transfer 21 KB
Monthly Cost €1/mo
Unattributable
Other
Optional
Execution 80ms
Transfer 0 KB
Monthly Cost €1/mo

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

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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