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https://aalto.fi

Performance

· 17 checks — Lighthouse + waterfall + sustainability rolled into one auditable list.
SCORE
81
GRADE
B
FIX
3
REVIEW
5
PASS
7
INFO
2

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

Mobile Desktop
60
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.
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.

3.95 s

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

8.63 s

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

280 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.

3.95 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.

8.81 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
7 PASS 5 REVIEW 3 FIX
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 (1.5 MiB of 1.5 MiB)
Info::
Third-party blocking time is low (0 ms)
100%
First-party Third-party
D
Page Weight Inventory
Action
54 resources · 1.5 MB · 202 KB savings available
FIX
54 resources · 1.5 MB · 202 KB savings available
Warning::
Page weight 474 KB over 1MB target
Got: 1.5 MB Expected: ≤ 1 MB
Info::
~202 KB of savings available
Warning::
53 third-party resources (100% of weight)
54 resources · 1.5 MiB · 53 third-party 474.4 KiB over 1MB target
JavaScript 37% · 558.8 KiB
Image 32% · 486.7 KiB
Font 20% · 299.6 KiB
CSS 8% · 123.1 KiB
Document 2% · 25.4 KiB
Other 0% · 4.9 KiB

~202.1 KiB of savings available

Remove unused JavaScript: 202.1 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
Page Weight Budget
1.5 MB transferred, 54 requests
REVIEW
1.5 MB transferred, 54 requests
Info::
Page weighs 4.4 MB (1.5 MB transferred)
Warning::
JavaScript is 550 KB — consider code splitting or lazy loading
Large JavaScript bundles delay interactivity. Split code by route or defer non-critical scripts.
Got: 550 KB
Info::
Fonts are 300 KB — consider subsetting or using system fonts
Subset fonts to include only used characters, or switch to system font stacks.
Got: 300 KB
Info::
54 HTTP requests
Info::
Estimated 0.31 g CO2 per page load
1.5 MB / 2.4 MB budget
1.5 MB transferred
54 requests
0.31 g CO2 per page load
JavaScript 550.4 KiB 37%
Images 450.9 KiB 30%
Fonts 299.6 KiB 20%
CSS 123.1 KiB 8%
Other 36.0 KiB 2%
HTML 25.4 KiB 2%
Other 11.2 KiB 1%
Other 945 B 0%
Other 703 B 0%
Other 257 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

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

B
Image Optimization
18 images, 0 KB saveable
REVIEW
18 images, 0 KB saveable
Info::
All images are well-optimized
18 images 451 KB
0 oversized -0 KB
14 legacy format
0 missing dimensions CLS risk
C
JS Execution Cost
Action
1861ms total JS execution
REVIEW
1861ms total JS execution
Warning::
https://www.aalto.fi/fi: 604ms CPU time
Warning::
https://consent.cookiebot.com/uc.js: 432ms CPU time
Warning::
Unattributable: 297ms CPU time
Info::
https://www.googletagmanager.com/gtm.js?id=GTM-N6W...: 214ms CPU time
Info::
https://www.aalto.fi/sites/default/files/js/js_p-4...: 186ms CPU time
Warning::
Third-party scripts: 1861ms (100% of total)

Main Thread Breakdown

Script Evaluation 36% Style & Layout 23% Other 21% Parse HTML & CSS 10% Script Parsing & Compilation 7%
ScriptTotalScriptingParse/CompileParty
https://www.aalto.fi/fi604ms19ms1ms3rd
https://consent.cookiebot.com/uc.js432ms194ms9ms3rd
Unattributable297ms45ms0ms3rd
https://www.googletagmanager.com/gtm.js?id=GTM-N6WP2H214ms171ms42ms3rd
https://www.aalto.fi/sites/default/files/js/js_p-4oHC4kUGK5AY3Ml8y7cwkTOo2w_ciFs-aZcFCmXYE.js?scope=footer&delta=10&language=fi&theme=aalto_aaltofi&include=eJx1UlF2hCAMvJCWI_ECRswKhELcXW9frLh1W_sDycy8ZEgA8MIatnMkBeesgwuukIuaR20niA4vJbImfGQSzFrwKYdmCBT1IuRJVnWBNZ2Bgo0OOBBoB95jvqA_F7JzQch2-ksKpwj3Mz6tacLIif1bLQrgULO5oRU90mHXMs-E9YoFo6grsCkHEPCwYlavqDG-jmjZqpcHiZ2q4h-86TlhhGOKe7LN-Wh0X1BlCAN0m4i082zAdz-mpJrSxrOda6sd7hvcN7ipDYt6RZ1jdh61gFOuHr_zD7jB8x0MHcUiEEHjEtQp3myM5Lo0mP0d_feW-n1NamSu3-ILtzP3Pg186ms156ms30ms3rd
https://www.aalto.fi/sites/default/files/js/js_j6qNKve4SY_QZ1Zc-cP61eJSdM-k7xkKtri8Q6OJN60.js?scope=footer&delta=0&language=fi&theme=aalto_aaltofi&include=eJx1UlF2hCAMvJCWI_ECRswKhELcXW9frLh1W_sDycy8ZEgA8MIatnMkBeesgwuukIuaR20niA4vJbImfGQSzFrwKYdmCBT1IuRJVnWBNZ2Bgo0OOBBoB95jvqA_F7JzQch2-ksKpwj3Mz6tacLIif1bLQrgULO5oRU90mHXMs-E9YoFo6grsCkHEPCwYlavqDG-jmjZqpcHiZ2q4h-86TlhhGOKe7LN-Wh0X1BlCAN0m4i082zAdz-mpJrSxrOda6sd7hvcN7ipDYt6RZ1jdh61gFOuHr_zD7jB8x0MHcUiEEHjEtQp3myM5Lo0mP0d_feW-n1NamSu3-ILtzP3Pg68ms46ms20ms3rd
https://www.aalto.fi/sites/default/files/css/css_aniBKT__JfrqPhtj82Qie8wzotCT0-tj8hSYtvl2f1I.css?delta=1&language=fi&theme=aalto_aaltofi&include=eJxVzlEOwiAMANALsRFNjPE0TYEKuI4SYIm7vVtEnT9N-9qmReQmgHu8R43HSv1V2hRMLiYPtlY4X663Ux8wWKlvzuQigkdmKuuxHdYcKEkW3ni7E8GzGGRlRaZIYCU1Sg0Mi52o6DcPnYfOfdpI099ss0LalSUjj_jAp8pY0BfMoX74J-OS8mI41kBO1bU2mvX-4AtlQWX_61ms0ms0ms3rd
C
JS Bundles
Action
21 scripts, 202 KB unused
REVIEW
21 scripts, 202 KB unused
Warning::
https://www.googletagmanager.com/gtm.js?id=GTM-N6W...: 78 KB unused (48%)
Consider code splitting or tree shaking to reduce unused code.
Warning::
https://www.aalto.fi/sites/default/files/js/js_p-4...: 54 KB unused (46%)
Consider code splitting or tree shaking to reduce unused code.
Warning::
https://www.aalto.fi/sites/default/files/js/js_j6q...: 50 KB unused (59%)
Consider code splitting or tree shaking to reduce unused code.
Warning::
https://consent.cookiebot.com/7439002e-4a7e-4422-b...: 20 KB unused (23%)
Consider code splitting or tree shaking to reduce unused code.
Info::
Total unused JavaScript: 202 KB
202 KB unused JavaScript

Downloaded but never executed on this page.

ScriptSizeUnusedMinifiedParty
https://www.googletagmanager.com/gtm.js?id=GTM-N6WP2H163 KB78 KB (48%)✓3rd
https://www.aalto.fi/sites/default/files/js/js_p-4oHC4kUGK5AY3Ml8y7cwkTOo2w_ciFs-aZcFCmXYE.js?scope=footer&delta=10&language=fi&theme=aalto_aaltofi&include=eJx1UlF2hCAMvJCWI_ECRswKhELcXW9frLh1W_sDycy8ZEgA8MIatnMkBeesgwuukIuaR20niA4vJbImfGQSzFrwKYdmCBT1IuRJVnWBNZ2Bgo0OOBBoB95jvqA_F7JzQch2-ksKpwj3Mz6tacLIif1bLQrgULO5oRU90mHXMs-E9YoFo6grsCkHEPCwYlavqDG-jmjZqpcHiZ2q4h-86TlhhGOKe7LN-Wh0X1BlCAN0m4i082zAdz-mpJrSxrOda6sd7hvcN7ipDYt6RZ1jdh61gFOuHr_zD7jB8x0MHcUiEEHjEtQp3myM5Lo0mP0d_feW-n1NamSu3-ILtzP3Pg116 KB54 KB (46%)✓3rd
https://www.aalto.fi/sites/default/files/js/js_j6qNKve4SY_QZ1Zc-cP61eJSdM-k7xkKtri8Q6OJN60.js?scope=footer&delta=0&language=fi&theme=aalto_aaltofi&include=eJx1UlF2hCAMvJCWI_ECRswKhELcXW9frLh1W_sDycy8ZEgA8MIatnMkBeesgwuukIuaR20niA4vJbImfGQSzFrwKYdmCBT1IuRJVnWBNZ2Bgo0OOBBoB95jvqA_F7JzQch2-ksKpwj3Mz6tacLIif1bLQrgULO5oRU90mHXMs-E9YoFo6grsCkHEPCwYlavqDG-jmjZqpcHiZ2q4h-86TlhhGOKe7LN-Wh0X1BlCAN0m4i082zAdz-mpJrSxrOda6sd7hvcN7ipDYt6RZ1jdh61gFOuHr_zD7jB8x0MHcUiEEHjEtQp3myM5Lo0mP0d_feW-n1NamSu3-ILtzP3Pg84 KB50 KB (59%)✓3rd
https://consent.cookiebot.com/7439002e-4a7e-4422-bda9-d575b2a8d8ce/cc.js?renew=false&referer=www.aalto.fi&dnt=false&init=false&culture=fi89 KB20 KB (23%)✓3rd
https://eum.instana.io/eum.min.js13 KB—✓3rd
https://www.aalto.fi/libraries/photoswipe/dist/photoswipe-ui-default.min.js?tdl4p84 KB—✓3rd
https://www.aalto.fi/sites/default/files/js/js_W7K33Ob2aYND9XTa7TtfXxQQqTynT8HPWP3EZcHZosA.js?scope=footer&delta=5&language=fi&theme=aalto_aaltofi&include=eJx1UlF2hCAMvJCWI_ECRswKhELcXW9frLh1W_sDycy8ZEgA8MIatnMkBeesgwuukIuaR20niA4vJbImfGQSzFrwKYdmCBT1IuRJVnWBNZ2Bgo0OOBBoB95jvqA_F7JzQch2-ksKpwj3Mz6tacLIif1bLQrgULO5oRU90mHXMs-E9YoFo6grsCkHEPCwYlavqDG-jmjZqpcHiZ2q4h-86TlhhGOKe7LN-Wh0X1BlCAN0m4i082zAdz-mpJrSxrOda6sd7hvcN7ipDYt6RZ1jdh61gFOuHr_zD7jB8x0MHcUiEEHjEtQp3myM5Lo0mP0d_feW-n1NamSu3-ILtzP3Pg15 KB—✓3rd
https://www.aalto.fi/sites/default/files/js/js_VoVHb1KfB24c4I0WT2asC1Cke0dbTX1ZAoydYzyST_0.js?scope=footer&delta=8&language=fi&theme=aalto_aaltofi&include=eJx1UlF2hCAMvJCWI_ECRswKhELcXW9frLh1W_sDycy8ZEgA8MIatnMkBeesgwuukIuaR20niA4vJbImfGQSzFrwKYdmCBT1IuRJVnWBNZ2Bgo0OOBBoB95jvqA_F7JzQch2-ksKpwj3Mz6tacLIif1bLQrgULO5oRU90mHXMs-E9YoFo6grsCkHEPCwYlavqDG-jmjZqpcHiZ2q4h-86TlhhGOKe7LN-Wh0X1BlCAN0m4i082zAdz-mpJrSxrOda6sd7hvcN7ipDYt6RZ1jdh61gFOuHr_zD7jB8x0MHcUiEEHjEtQp3myM5Lo0mP0d_feW-n1NamSu3-ILtzP3Pg6 KB—✓3rd
https://cdn.jsdelivr.net/npm/js-cookie@3.0.5/dist/js.cookie.min.js1 KB—✓3rd
https://www.aalto.fi/modules/contrib/google_tag/js/gtm.js?tdl4p81 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

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

C
Green Hosting
Action
Whether the site is served from green-energy infrastructure
REVIEW

Green Hosting

No green hosting detected

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
2 fonts (300 KB)
PASS
2 fonts (300 KB)
Info::
2 font(s) use font-display: swap (FOUT risk but functional)

Web fonts

2

300 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 1.0 s 2.0 s 3.0 s 4.0 s 5.0 s 6.0 s 7.0 s 8.0 s 9.0 s FCP 3.9 s LCP 8.6 shttps://www.aalto.fi/themes/custom/aalto_base/fonts/Inter-Regular.ttf?hash=079af0e2936ccb99b391ddc0bbb73dcbInter-Regular.ttf https://www.aalto.fi/themes/custom/aalto_base/fonts/Inter-Regular.ttf?hash=079af0e2936ccb99b391ddc0bbb73dcb — 144.4 KiB — 13 ms — font-display: swaphttps://www.aalto.fi/themes/custom/aalto_base/fonts/Inter-Bold.ttf?hash=275bfea5dc74c33f51916fee80feae67Inter-Bold.ttf https://www.aalto.fi/themes/custom/aalto_base/fonts/Inter-Bold.ttf?hash=275bfea5dc74c33f51916fee80feae67 — 155.1 KiB — 12 ms — font-display: swap
Inter-Regular.ttf ttf swap
Size 144 KB
Load time 13 ms
Start 146 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
Inter-Bold.ttf ttf swap
Size 155 KB
Load time 12 ms
Start 146 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
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 ~240 KB and ~480 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+
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
Network Waterfall
54 requests over 2483ms
INFO
0 ms 1.0 s 2.0 s 3.0 s 4.0 s 5.0 s 6.0 s 7.0 s 8.0 s 9.0 s FCP 3.9 s LCP 8.6 shttps://aalto.fi// https://aalto.fi/ — 301 — 169 B — 10 ms — h2https://www.aalto.fi/fiwww.aalto.fi/fi https://www.aalto.fi/fi — 200 — 24.6 KiB — 9 ms — h2https://consent.cookiebot.com/uc.jsconsent.cookiebot.com/uc.js https://consent.cookiebot.com/uc.js — 200 — 27.0 KiB — 59 ms — h2https://www.aalto.fi/sites/default/files/css/css_FmDIHNe4kW1a0bxWyL-ADBneRMWyBsYDIOdmCFeKItU.css?delta=0&language=fi&theme=aalto_aaltofi&include=eJxVzlEOwiAMANALsRFNjPE0TYEKuI4SYIm7vVtEnT9N-9qmReQmgHu8R43HSv1V2hRMLiYPtlY4X663Ux8wWKlvzuQigkdmKuuxHdYcKEkW3ni7E8GzGGRlRaZIYCU1Sg0Mi52o6DcPnYfOfdpI099ss0LalSUjj_jAp8pY0BfMoX74J-OS8mI41kBO1bU2mvX-4AtlQWX_www.aalto.fi/sites/default/files/cs... https://www.aalto.fi/sites/default/files/css/css_FmDIHNe4kW1a0bxWyL-ADBneRMWyBsYDIOdmCFeKItU.css?delta=0&language=fi&theme=aalto_aaltofi&include=eJxVzlEOwiAMANALsRFNjPE0TYEKuI4SYIm7vVtEnT9N-9qmReQmgHu8R43HSv1V2hRMLiYPtlY4X663Ux8wWKlvzuQigkdmKuuxHdYcKEkW3ni7E8GzGGRlRaZIYCU1Sg0Mi52o6DcPnYfOfdpI099ss0LalSUjj_jAp8pY0BfMoX74J-OS8mI41kBO1bU2mvX-4AtlQWX_ — 200 — 2.9 KiB — 9 ms — h2https://www.aalto.fi/sites/default/files/css/css_aniBKT__JfrqPhtj82Qie8wzotCT0-tj8hSYtvl2f1I.css?delta=1&language=fi&theme=aalto_aaltofi&include=eJxVzlEOwiAMANALsRFNjPE0TYEKuI4SYIm7vVtEnT9N-9qmReQmgHu8R43HSv1V2hRMLiYPtlY4X663Ux8wWKlvzuQigkdmKuuxHdYcKEkW3ni7E8GzGGRlRaZIYCU1Sg0Mi52o6DcPnYfOfdpI099ss0LalSUjj_jAp8pY0BfMoX74J-OS8mI41kBO1bU2mvX-4AtlQWX_www.aalto.fi/sites/default/files/cs... https://www.aalto.fi/sites/default/files/css/css_aniBKT__JfrqPhtj82Qie8wzotCT0-tj8hSYtvl2f1I.css?delta=1&language=fi&theme=aalto_aaltofi&include=eJxVzlEOwiAMANALsRFNjPE0TYEKuI4SYIm7vVtEnT9N-9qmReQmgHu8R43HSv1V2hRMLiYPtlY4X663Ux8wWKlvzuQigkdmKuuxHdYcKEkW3ni7E8GzGGRlRaZIYCU1Sg0Mi52o6DcPnYfOfdpI099ss0LalSUjj_jAp8pY0BfMoX74J-OS8mI41kBO1bU2mvX-4AtlQWX_ — 200 — 120.2 KiB — 18 ms — h2https://www.aalto.fi/sites/default/files/js/js_ii7ZUWWgPQl4kliGV9Jd6V0hj5CBPcoscuukQVkE8F4.js?scope=header&delta=0&language=fi&theme=aalto_aaltofi&include=eJx1UlF2hCAMvJCWI_ECRswKhELcXW9frLh1W_sDycy8ZEgA8MIatnMkBeesgwuukIuaR20niA4vJbImfGQSzFrwKYdmCBT1IuRJVnWBNZ2Bgo0OOBBoB95jvqA_F7JzQch2-ksKpwj3Mz6tacLIif1bLQrgULO5oRU90mHXMs-E9YoFo6grsCkHEPCwYlavqDG-jmjZqpcHiZ2q4h-86TlhhGOKe7LN-Wh0X1BlCAN0m4i082zAdz-mpJrSxrOda6sd7hvcN7ipDYt6RZ1jdh61gFOuHr_zD7jB8x0MHcUiEEHjEtQp3myM5Lo0mP0d_feW-n1NamSu3-ILtzP3Pgwww.aalto.fi/sites/default/files/js... 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datahttps://www.aalto.fi/themes/custom/aalto_base/images/cookie_blue.svg?hash=324fa8fa3f001f2c2200fd6c9487b991www.aalto.fi/themes/custom/aalto_ba... https://www.aalto.fi/themes/custom/aalto_base/images/cookie_blue.svg?hash=324fa8fa3f001f2c2200fd6c9487b991 — 200 — 2.6 KiB — 3 ms — h2data:image/png;base64,iVBORw0KGgoAAAANSUhEUgAAAN0AAAAuCAYAAACswhytAAAAAXNSR0IArs4c6QAAAARnQU1BAACxj…data:image/png;base64,iVBORw0KGgoAA... data:image/png;base64,iVBORw0KGgoAAAANSUhEUgAAAN0AAAAuCAYAAACswhytAAAAAXNSR0IArs4c6QAAAARnQU1BAACxj… — 200 — 0 B — 0 ms — datadata:image/png;base64,iVBORw0KGgoAAAANSUhEUgAAABIAAAASCAYAAABWzo5XAAAACXBIWXMAAAsTAAALEwEAmpwYAAAAA…data:image/png;base64,iVBORw0KGgoAA... data:image/png;base64,iVBORw0KGgoAAAANSUhEUgAAABIAAAASCAYAAABWzo5XAAAACXBIWXMAAAsTAAALEwEAmpwYAAAAA… — 200 — 0 B — 0 ms — datahttps://www.aalto.fi/sites/default/files/favicons/favicon-32x32.pngwww.aalto.fi/sites/default/files/fa... https://www.aalto.fi/sites/default/files/favicons/favicon-32x32.png — 200 — 976 B — 3 ms — h2https://eum-blue-saas.instana.io/eum-blue-saas.instana.io/ https://eum-blue-saas.instana.io/ — 200 — 257 B — 179 ms — http/1.1
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 1861ms · 535KB · €20/mo
www.aalto.fi
Other
Costly
Execution 604ms
Transfer 25 KB
Monthly Cost €7/mo
consent.cookiebot.com
Other
Costly
Execution 432ms
Transfer 27 KB
Monthly Cost €5/mo
Unattributable
Other
Costly
Execution 297ms
Transfer 0 KB
Monthly Cost €3/mo
Google Tag Manager
Tag Manager
Costly
Execution 214ms
Transfer 163 KB
Unused 48%
Monthly Cost €2/mo
www.aalto.fi
Other
Optional
Execution 186ms
Transfer 116 KB
Unused 46%
Monthly Cost €2/mo
www.aalto.fi
Other
Optional
Execution 68ms
Transfer 84 KB
Unused 59%
Monthly Cost €1/mo
www.aalto.fi
Other
Optional
Execution 61ms
Transfer 120 KB
Monthly Cost €1/mo

These scripts may cost more than they're worth

  • www.aalto.fi adds 604ms and costs ~€7/month
  • consent.cookiebot.com adds 432ms and costs ~€5/month
  • Unattributable adds 297ms and costs ~€3/month
  • Google Tag Manager adds 214ms and costs ~€2/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

www.aalto.fi takes 604ms 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

consent.cookiebot.com takes 432ms 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

Unattributable takes 297ms 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

Google Tag Manager takes 214ms 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

59% of www.aalto.fi's code is unused. The script may be loading features you don't use.

Why this matters

Bundle has high unused-code ratio — tree-shaking and route-splitting recover the wasted bytes.

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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