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https://helsinki.fi

Performance

· 17 checks — Lighthouse + waterfall + sustainability rolled into one auditable list.
SCORE
78
GRADE
C
FIX
5
REVIEW
2
PASS
8
INFO
2

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

Mobile Desktop
40
Performance Overall performance score (0–100) based on Core Web Vitals and other metrics. 90+ is good.
90
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.

5.03 s

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

13.13 s

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

749 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.

7.59 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.

15.54 s

Page Load Progression

505 ms
1.0 s
1.5 s
2.0 s
2.5 s
3.0 s
3.5 s
4.0 s
Checks
17
8 PASS 2 REVIEW 5 FIX
D
Page Weight Budget
Action
2.1 MB transferred, 92 requests
FIX
2.1 MB transferred, 92 requests
Info::
Page weighs 4.2 MB (2.1 MB transferred)
Info::
Fonts are 1.0 MB — consider subsetting or using system fonts
Subset fonts to include only used characters, or switch to system font stacks.
Got: 1.0 MB
Warning::
JavaScript is 773 KB — consider code splitting or lazy loading
Large JavaScript bundles delay interactivity. Split code by route or defer non-critical scripts.
Got: 773 KB
Info::
92 HTTP requests
Info::
Estimated 0.44 g CO2 per page load
2.1 MB / 2.4 MB budget
2.1 MB transferred
92 requests
0.44 g CO2 per page load
Fonts 1.0 MiB 48%
JavaScript 772.6 KiB 36%
Images 259.2 KiB 12%
HTML 48.0 KiB 2%
CSS 31.5 KiB 1%
Other 3.1 KiB 0%
Other 1.4 KiB 0%
Other 0 B 0%
0 2.4 MB 4.9 MB
Approaching limit

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

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

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 (2.1 MiB of 2.1 MiB)
Info::
Third-party blocking time is low (0 ms)
100%
First-party Third-party
F
JS Execution Cost
Action
4241ms total JS execution
FIX
4241ms total JS execution
Warning::
https://www.helsinki.fi/themes/custom/helsingin_yl...: 807ms CPU time
Warning::
https://www.helsinki.fi/en: 676ms CPU time
Warning::
Unattributable: 654ms CPU time
Warning::
https://consent.cookiebot.com/e422c4ee-0ebe-400c-b...: 620ms CPU time
Warning::
https://www.helsinki.fi/themes/custom/helsingin_yl...: 373ms CPU time
Warning::
Third-party scripts: 4241ms (100% of total)

Main Thread Breakdown

Script Evaluation 49% Other 19% Style & Layout 14% Parse HTML & CSS 8% Script Parsing & Compilation 6%
ScriptTotalScriptingParse/CompileParty
https://www.helsinki.fi/themes/custom/helsingin_yliopisto/dist/hudslib-0.12.0/esm/index-2ffe17c9.js807ms688ms0ms3rd
https://www.helsinki.fi/en676ms21ms7ms3rd
Unattributable654ms60ms0ms3rd
https://consent.cookiebot.com/e422c4ee-0ebe-400c-b22b-9c74b6faeac3/cc.js?renew=false&referer=www.helsinki.fi&dnt=false&init=false620ms245ms76ms3rd
https://www.helsinki.fi/themes/custom/helsingin_yliopisto/dist/uhds-1.0.1/component-library/index-BuQM5G1b.js373ms293ms0ms3rd
https://d2oarllo6tn86.cloudfront.net/sites/helsinki_fi.js286ms252ms11ms3rd
https://consent.cookiebot.com/uc.js199ms169ms14ms3rd
https://www.googletagmanager.com/gtm.js?id=GTM-5PMSGQ158ms105ms52ms3rd
https://customer.cludo.com/templates/2594/11998/dist/js/cludo-search-results.js143ms104ms38ms3rd
https://www.helsinki.fi/themes/custom/helsingin_yliopisto/dist/js/hy-handle-gtm-delay.min.js?v=1.x133ms130ms0ms3rd

Showing top 10 of 13 scripts

D
Page Weight Inventory
Action
92 resources · 2.1 MB · 235 KB savings available
FIX
92 resources · 2.1 MB · 235 KB savings available
Warning::
Page weight 1.1 MB over 1MB target
Got: 2.1 MB Expected: ≤ 1 MB
Info::
~235 KB of savings available
Warning::
91 third-party resources (100% of weight)
Info::
2 resources over 200KB
92 resources · 2.1 MiB · 91 third-party 1.1 MiB over 1MB target
Font 48% · 1.0 MiB
JavaScript 36% · 772.6 KiB
Image 12% · 260.4 KiB
Document 2% · 48.1 KiB
CSS 1% · 31.5 KiB
Other 0% · 3.2 KiB

~235.4 KiB of savings available

Remove unused JavaScript: 235.4 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
JS Bundles
Action
68 scripts, 235 KB unused
REVIEW
68 scripts, 235 KB unused
Warning::
https://www.googletagmanager.com/gtm.js?id=GTM-5PM...: 86 KB unused (51%)
Consider code splitting or tree shaking to reduce unused code.
Warning::
https://customer.cludo.com/templates/2594/11998/di...: 49 KB unused (66%)
Consider code splitting or tree shaking to reduce unused code.
Warning::
https://www.helsinki.fi/sites/default/files/js/js_...: 27 KB unused (74%)
Consider code splitting or tree shaking to reduce unused code.
Warning::
https://customer.cludo.com/scripts/bundles/search-...: 25 KB unused (52%)
Consider code splitting or tree shaking to reduce unused code.
Warning::
https://consent.cookiebot.com/e422c4ee-0ebe-400c-b...: 25 KB unused (24%)
Consider code splitting or tree shaking to reduce unused code.
Info::
Total unused JavaScript: 235 KB
235 KB unused JavaScript

Downloaded but never executed on this page.

ScriptSizeUnusedMinifiedParty
https://www.googletagmanager.com/gtm.js?id=GTM-5PMSGQ168 KB86 KB (51%)✓3rd
https://customer.cludo.com/templates/2594/11998/dist/js/cludo-search-results.js75 KB49 KB (66%)✓3rd
https://www.helsinki.fi/sites/default/files/js/js_MYhGOsBvUFurx-Db_M6LGjYTEH9Thw6V-YNskMVxFSU.js?scope=footer&delta=0&language=en&theme=helsingin_yliopisto&include=eJyF0EEOAjEIBdALSTySoVNsiRQaYdTe3ro0GeuGxf8vf0ElcdbCehnC1tnDzpmci4IPD2ognE71QBWxhAIeM9JySCpqFoJN9myQSXCsWIm2QmOWfgvroPjggsGmv2SzxHPxD1R6Olxxi2Qv6Oa8lp8jFEH3Nd4rfH3wDW65jb838 KB27 KB (74%)✓3rd
https://customer.cludo.com/scripts/bundles/search-script.min.js51 KB25 KB (52%)✓3rd
https://consent.cookiebot.com/e422c4ee-0ebe-400c-b22b-9c74b6faeac3/cc.js?renew=false&referer=www.helsinki.fi&dnt=false&init=false106 KB25 KB (24%)✓3rd
https://consent.cookiebot.com/uc.js36 KB23 KB (64%)✓3rd
https://www.helsinki.fi/themes/custom/helsingin_yliopisto/dist/uhds-1.0.1/component-library/index-BuQM5G1b.js21 KB—✓3rd
https://www.helsinki.fi/themes/custom/helsingin_yliopisto/dist/hudslib-0.12.0/esm/ResizeObserver.es-ccb10328.js4 KB—✓3rd
https://www.helsinki.fi/themes/custom/helsingin_yliopisto/dist/hudslib-0.12.0/esm/hy-box.entry.js2 KB—✓3rd
https://www.helsinki.fi/themes/custom/helsingin_yliopisto/dist/hudslib-0.12.0/esm/hy-breadcrumbs_15.entry.js26 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

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+
Image Optimization
10 images, 0 KB saveable
PASS
10 images, 0 KB saveable
Info::
All images are well-optimized
10 images 259 KB
0 oversized -0 KB
0 legacy format
0 missing dimensions CLS risk
A+
Font Loading
2 fonts (1037 KB)
PASS
2 fonts (1037 KB)
Info::
2 font(s) use font-display: swap (FOUT risk but functional)

Web fonts

2

1037 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 2.0 s 4.0 s 6.0 s 8.0 s 10.0 s 12.0 s FCP 5.0 s LCP 13.1 shttps://www.helsinki.fi/themes/custom/helsingin_yliopisto/dist/uhds/fonts/OpenSans-VariableFont_wdth,wght.ttfOpenSans-VariableFont_w... https://www.helsinki.fi/themes/custom/helsingin_yliopisto/dist/uhds/fonts/OpenSans-VariableFont_wdth,wght.ttf — 518.4 KiB — 956 ms — font-display: swaphttps://www.helsinki.fi/themes/custom/helsingin_yliopisto/dist/uhds/fonts/OpenSans-VariableFont_wdth%2Cwght.ttfOpenSans-VariableFont_w... https://www.helsinki.fi/themes/custom/helsingin_yliopisto/dist/uhds/fonts/OpenSans-VariableFont_wdth%2Cwght.ttf — 518.4 KiB — 531 ms — font-display: swap
OpenSans-VariableFont_w... ttf swap
Size 518 KB
Load time 956 ms
Start 1.9 s
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
OpenSans-VariableFont_w... ttf swap
Size 518 KB
Load time 531 ms
Start 2.5 s
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 ~829 KB and ~1658 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
8 hints, 0 missing preconnects
PASS
8 hints, 0 missing preconnects
Info::
Page uses 8 resource hint(s)

Current Resource Hints

preconnect
3
preload
2
dns-prefetch
3
prefetch
—

8 resource hints configured

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
92 requests over 6756ms
INFO
0 ms 2.0 s 4.0 s 6.0 s 8.0 s 10.0 s 12.0 s FCP 5.0 s LCP 13.1 shttps://helsinki.fi// https://helsinki.fi/ — 301 — 116 B — 551 ms — h2https://www.helsinki.fi/www.helsinki.fi/ https://www.helsinki.fi/ — 302 — 108 B — 1.1 s — h2https://www.helsinki.fi/enwww.helsinki.fi/en https://www.helsinki.fi/en — 200 — 47.2 KiB — 571 ms — h2https://www.helsinki.fi/assets/drupal/styles/hero_image_tablet/s3/media-image/HY_tutkimuksen_karjet_tulevaisuuden_teknologiat-1920x1200.jpg.webp?itok=oWIZRAjmwww.helsinki.fi/assets/drupal/style... https://www.helsinki.fi/assets/drupal/styles/hero_image_tablet/s3/media-image/HY_tutkimuksen_karjet_tulevaisuuden_teknologiat-1920x1200.jpg.webp?itok=oWIZRAjm — 200 — 39.8 KiB — 369 ms — h2https://consent.cookiebot.com/uc.jsconsent.cookiebot.com/uc.js https://consent.cookiebot.com/uc.js — 200 — 35.7 KiB — 48 ms — h2https://www.helsinki.fi/themes/custom/helsingin_yliopisto/dist/hudslib-0.12.0/esm/globalScript-3f479486.jswww.helsinki.fi/themes/custom/helsi... https://www.helsinki.fi/themes/custom/helsingin_yliopisto/dist/hudslib-0.12.0/esm/globalScript-3f479486.js — 200 — 1.1 KiB — 565 ms — h2https://www.helsinki.fi/themes/custom/helsingin_yliopisto/dist/hudslib-0.12.0/esm/huds-lib.jswww.helsinki.fi/themes/custom/helsi... https://www.helsinki.fi/themes/custom/helsingin_yliopisto/dist/hudslib-0.12.0/esm/huds-lib.js — 200 — 8.4 KiB — 736 ms — h2https://www.helsinki.fi/themes/custom/helsingin_yliopisto/dist/hudslib-0.12.0/esm/hy-box.entry.jswww.helsinki.fi/themes/custom/helsi... https://www.helsinki.fi/themes/custom/helsingin_yliopisto/dist/hudslib-0.12.0/esm/hy-box.entry.js — 200 — 2.4 KiB — 562 ms — h2https://www.helsinki.fi/themes/custom/helsingin_yliopisto/dist/hudslib-0.12.0/esm/hy-breadcrumbs_15.entry.jswww.helsinki.fi/themes/custom/helsi... https://www.helsinki.fi/themes/custom/helsingin_yliopisto/dist/hudslib-0.12.0/esm/hy-breadcrumbs_15.entry.js — 200 — 25.9 KiB — 735 ms — h2https://www.helsinki.fi/themes/custom/helsingin_yliopisto/dist/hudslib-0.12.0/esm/hy-hero-carousel.entry.jswww.helsinki.fi/themes/custom/helsi... https://www.helsinki.fi/themes/custom/helsingin_yliopisto/dist/hudslib-0.12.0/esm/hy-hero-carousel.entry.js — 200 — 39.8 KiB — 581 ms — h2https://www.helsinki.fi/themes/custom/helsingin_yliopisto/dist/hudslib-0.12.0/esm/hy-icon-caret-down.entry.jswww.helsinki.fi/themes/custom/helsi... https://www.helsinki.fi/themes/custom/helsingin_yliopisto/dist/hudslib-0.12.0/esm/hy-icon-caret-down.entry.js — 200 — 1.3 KiB — 560 ms — h2https://www.helsinki.fi/themes/custom/helsingin_yliopisto/dist/hudslib-0.12.0/esm/hy-icon-caret-left.entry.jswww.helsinki.fi/themes/custom/helsi... https://www.helsinki.fi/themes/custom/helsingin_yliopisto/dist/hudslib-0.12.0/esm/hy-icon-caret-left.entry.js — 200 — 1.2 KiB — 563 ms — h2https://www.helsinki.fi/themes/custom/helsingin_yliopisto/dist/hudslib-0.12.0/esm/hy-icon-caret-right.entry.jswww.helsinki.fi/themes/custom/helsi... https://www.helsinki.fi/themes/custom/helsingin_yliopisto/dist/hudslib-0.12.0/esm/hy-icon-caret-right.entry.js — 200 — 1.3 KiB — 559 ms — h2https://www.helsinki.fi/themes/custom/helsingin_yliopisto/dist/hudslib-0.12.0/esm/hy-icon-caret-up.entry.jswww.helsinki.fi/themes/custom/helsi... https://www.helsinki.fi/themes/custom/helsingin_yliopisto/dist/hudslib-0.12.0/esm/hy-icon-caret-up.entry.js — 200 — 1.2 KiB — 557 ms — h2https://www.helsinki.fi/themes/custom/helsingin_yliopisto/dist/hudslib-0.12.0/esm/hy-icon-globe.entry.jswww.helsinki.fi/themes/custom/helsi... https://www.helsinki.fi/themes/custom/helsingin_yliopisto/dist/hudslib-0.12.0/esm/hy-icon-globe.entry.js — 200 — 1.7 KiB — 561 ms — h2https://www.helsinki.fi/themes/custom/helsingin_yliopisto/dist/hudslib-0.12.0/esm/hy-icon-heart-support.entry.jswww.helsinki.fi/themes/custom/helsi... https://www.helsinki.fi/themes/custom/helsingin_yliopisto/dist/hudslib-0.12.0/esm/hy-icon-heart-support.entry.js — 200 — 1.8 KiB — 562 ms — h2https://www.helsinki.fi/themes/custom/helsingin_yliopisto/dist/hudslib-0.12.0/esm/hy-icon-hy-logo.entry.jswww.helsinki.fi/themes/custom/helsi... https://www.helsinki.fi/themes/custom/helsingin_yliopisto/dist/hudslib-0.12.0/esm/hy-icon-hy-logo.entry.js — 200 — 1.7 KiB — 562 ms — h2https://www.helsinki.fi/themes/custom/helsingin_yliopisto/dist/hudslib-0.12.0/esm/hy-icon-search.entry.jswww.helsinki.fi/themes/custom/helsi... https://www.helsinki.fi/themes/custom/helsingin_yliopisto/dist/hudslib-0.12.0/esm/hy-icon-search.entry.js — 200 — 1.6 KiB — 559 ms — h2https://www.helsinki.fi/themes/custom/helsingin_yliopisto/dist/hudslib-0.12.0/esm/hy-image.entry.jswww.helsinki.fi/themes/custom/helsi... https://www.helsinki.fi/themes/custom/helsingin_yliopisto/dist/hudslib-0.12.0/esm/hy-image.entry.js — 200 — 2.1 KiB — 560 ms — h2https://www.helsinki.fi/themes/custom/helsingin_yliopisto/dist/hudslib-0.12.0/esm/hy-main.entry.jswww.helsinki.fi/themes/custom/helsi... https://www.helsinki.fi/themes/custom/helsingin_yliopisto/dist/hudslib-0.12.0/esm/hy-main.entry.js — 200 — 1.6 KiB — 561 ms — h2https://www.helsinki.fi/themes/custom/helsingin_yliopisto/dist/hudslib-0.12.0/esm/index-2ffe17c9.jswww.helsinki.fi/themes/custom/helsi... https://www.helsinki.fi/themes/custom/helsingin_yliopisto/dist/hudslib-0.12.0/esm/index-2ffe17c9.js — 200 — 11.1 KiB — 729 ms — h2https://www.helsinki.fi/themes/custom/helsingin_yliopisto/dist/hudslib-0.12.0/esm/utils-1e7f5184.jswww.helsinki.fi/themes/custom/helsi... https://www.helsinki.fi/themes/custom/helsingin_yliopisto/dist/hudslib-0.12.0/esm/utils-1e7f5184.js — 200 — 2.4 KiB — 736 ms — h2https://www.helsinki.fi/themes/custom/helsingin_yliopisto/dist/uhds/fonts/OpenSans-VariableFont_wdth,wght.ttfwww.helsinki.fi/themes/custom/helsi... https://www.helsinki.fi/themes/custom/helsingin_yliopisto/dist/uhds/fonts/OpenSans-VariableFont_wdth,wght.ttf — 200 — 518.4 KiB — 956 ms — h2https://www.helsinki.fi/sites/default/files/css/css_7ooxM-l6bf4zWn8YrkxVGWxVQ4sag9qSeLiN6ZTOY8M.css?delta=0&language=en&theme=helsingin_yliopisto&include=eJyNjtEKwyAMRX-oqZ8kOjMNZEaMdvj3swxaBj7sMSfnJjchK-VI2Q4mKaRNTEClmEGHNnwBk9_Swoos3jFomyjHpdIT_Nz6S4Kn5KZL9aCAUqS2-fcgfMNDpzgsz60trrpYXUkmDTgJXAS8U9yuUU2ovTjeb7L3XLqfqYRh-_YwZ-gDdtlx6gwww.helsinki.fi/sites/default/files... 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h2https://www.helsinki.fi/themes/custom/helsingin_yliopisto/dist/hudslib-0.12.0/esm/hy-cta-button.entry.jswww.helsinki.fi/themes/custom/helsi... https://www.helsinki.fi/themes/custom/helsingin_yliopisto/dist/hudslib-0.12.0/esm/hy-cta-button.entry.js — 200 — 2.6 KiB — 193 ms — h2https://fi1.frosmo.com/messageApi?method=multifetch&origin=helsinki_fi&cookieId=anonymous.00000000&positions=2057.5129.5130.5131.5132.5652.5436.4693.4692.4691.4690.4689.4688.4687.4686.4685.4385&states=%7B%22_device%22%3A%22mobile%22%2C%22loginStatus%22%3A%22unauthenticated%22%7D&debug=false&_source=core&_ts=1776805286388&_ver=26.1.0-3.6&segments=&source=direct&sessionStart=20260421210126&profile=opt-outfi1.frosmo.com/messageApi?method=mu... 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h2https://www.helsinki.fi/themes/custom/helsingin_yliopisto/dist/uhds-1.0.1/component-library/index-BfTCfPZ1.jswww.helsinki.fi/themes/custom/helsi... https://www.helsinki.fi/themes/custom/helsingin_yliopisto/dist/uhds-1.0.1/component-library/index-BfTCfPZ1.js — 200 — 1.3 KiB — 198 ms — h2https://www.helsinki.fi/themes/custom/helsingin_yliopisto/dist/uhds-1.0.1/component-library/attributes-CS-f1DU8.jswww.helsinki.fi/themes/custom/helsi... https://www.helsinki.fi/themes/custom/helsingin_yliopisto/dist/uhds-1.0.1/component-library/attributes-CS-f1DU8.js — 200 — 1.5 KiB — 215 ms — h2https://www.helsinki.fi/themes/custom/helsingin_yliopisto/dist/uhds-1.0.1/component-library/linkUtils-BNCHswss.jswww.helsinki.fi/themes/custom/helsi... https://www.helsinki.fi/themes/custom/helsingin_yliopisto/dist/uhds-1.0.1/component-library/linkUtils-BNCHswss.js — 200 — 1.1 KiB — 228 ms — h2https://www.helsinki.fi/themes/custom/helsingin_yliopisto/dist/uhds-1.0.1/component-library/utils-BZWvtXT4.jswww.helsinki.fi/themes/custom/helsi... https://www.helsinki.fi/themes/custom/helsingin_yliopisto/dist/uhds-1.0.1/component-library/utils-BZWvtXT4.js — 200 — 1.3 KiB — 218 ms — h2https://www.helsinki.fi/themes/custom/helsingin_yliopisto/dist/uhds-1.0.1/component-library/cx-R83ghDub.jswww.helsinki.fi/themes/custom/helsi... https://www.helsinki.fi/themes/custom/helsingin_yliopisto/dist/uhds-1.0.1/component-library/cx-R83ghDub.js — 200 — 990 B — 223 ms — h2https://www.helsinki.fi/themes/custom/helsingin_yliopisto/dist/uhds-1.0.1/component-library/store-sjnG0AVN.jswww.helsinki.fi/themes/custom/helsi... https://www.helsinki.fi/themes/custom/helsingin_yliopisto/dist/uhds-1.0.1/component-library/store-sjnG0AVN.js — 200 — 1.9 KiB — 217 ms — h2https://www.helsinki.fi/themes/custom/helsingin_yliopisto/dist/hudslib-0.12.0/esm/hy-icon-remove.entry.jswww.helsinki.fi/themes/custom/helsi... 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h2https://www.helsinki.fi/themes/custom/helsingin_yliopisto/dist/uhds-1.0.1/component-library/ds-icon.entry.jswww.helsinki.fi/themes/custom/helsi... https://www.helsinki.fi/themes/custom/helsingin_yliopisto/dist/uhds-1.0.1/component-library/ds-icon.entry.js — 200 — 1.5 KiB — 196 ms — h2https://www.helsinki.fi/themes/custom/helsingin_yliopisto/dist/uhds-1.0.1/component-library/ds-visually-hidden.entry.jswww.helsinki.fi/themes/custom/helsi... https://www.helsinki.fi/themes/custom/helsingin_yliopisto/dist/uhds-1.0.1/component-library/ds-visually-hidden.entry.js — 200 — 1.2 KiB — 192 ms — h2https://www.helsinki.fi/themes/custom/helsingin_yliopisto/dist/uhds-1.0.1/component-library/ds-accordion.entry.jswww.helsinki.fi/themes/custom/helsi... https://www.helsinki.fi/themes/custom/helsingin_yliopisto/dist/uhds-1.0.1/component-library/ds-accordion.entry.js — 200 — 3.4 KiB — 193 ms — h2https://www.helsinki.fi/themes/custom/helsingin_yliopisto/dist/hudslib-0.12.0/esm/hy-icon-hamburger.entry.jswww.helsinki.fi/themes/custom/helsi... https://www.helsinki.fi/themes/custom/helsingin_yliopisto/dist/hudslib-0.12.0/esm/hy-icon-hamburger.entry.js — 200 — 1.3 KiB — 193 ms — h2https://www.helsinki.fi/themes/custom/helsingin_yliopisto/dist/uhds-1.0.1/component-library/ds-icon-arrow-outward.entry.jswww.helsinki.fi/themes/custom/helsi... https://www.helsinki.fi/themes/custom/helsingin_yliopisto/dist/uhds-1.0.1/component-library/ds-icon-arrow-outward.entry.js — 200 — 1.3 KiB — 193 ms — h2https://www.helsinki.fi/themes/custom/helsingin_yliopisto/dist/uhds-1.0.1/component-library/ds-icon-arrow-forward.entry.jswww.helsinki.fi/themes/custom/helsi... https://www.helsinki.fi/themes/custom/helsingin_yliopisto/dist/uhds-1.0.1/component-library/ds-icon-arrow-forward.entry.js — 200 — 1.3 KiB — 198 ms — h2https://www.helsinki.fi/themes/custom/helsingin_yliopisto/dist/uhds-1.0.1/component-library/ds-icon-keyboard-arrow-down.entry.jswww.helsinki.fi/themes/custom/helsi... https://www.helsinki.fi/themes/custom/helsingin_yliopisto/dist/uhds-1.0.1/component-library/ds-icon-keyboard-arrow-down.entry.js — 200 — 1.3 KiB — 194 ms — h2https://customer.cludo.com/scripts/bundles/search-script.min.jscustomer.cludo.com/scripts/bundles/... https://customer.cludo.com/scripts/bundles/search-script.min.js — 200 — 51.1 KiB — 10 ms — h2https://customer.cludo.com/templates/2594/11998/dist/js/cludo-search-results.jscustomer.cludo.com/templates/2594/1... https://customer.cludo.com/templates/2594/11998/dist/js/cludo-search-results.js — 200 — 75.4 KiB — 10 ms — h2https://api.cludo.com/api/v3/2594/14064/websites/publicsettingsapi.cludo.com/api/v3/2594/14064/web... https://api.cludo.com/api/v3/2594/14064/websites/publicsettings — 200 — 0 B — 519 ms — h2https://api.cludo.com/api/v3/2594/14064/websites/publicsettingsapi.cludo.com/api/v3/2594/14064/web... https://api.cludo.com/api/v3/2594/14064/websites/publicsettings — 200 — 1.5 KiB — 181 ms — h2https://www.googletagmanager.com/gtm.js?id=GTM-5PMSGQwww.googletagmanager.com/gtm.js?id=... https://www.googletagmanager.com/gtm.js?id=GTM-5PMSGQ — 200 — 168.0 KiB — 89 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 4241ms · 618KB · €46/mo
www.helsinki.fi
Other
Costly
Execution 807ms
Transfer 11 KB
Monthly Cost €9/mo
www.helsinki.fi
Other
Costly
Execution 676ms
Transfer 47 KB
Monthly Cost €7/mo
Unattributable
Other
Costly
Execution 654ms
Transfer 0 KB
Monthly Cost €7/mo
consent.cookiebot.com
Other
Costly
Execution 620ms
Transfer 106 KB
Unused 24%
Monthly Cost €7/mo
www.helsinki.fi
Other
Costly
Execution 373ms
Transfer 21 KB
Monthly Cost €4/mo
d2oarllo6tn86.cloudfront.net
Other
Costly
Execution 286ms
Transfer 25 KB
Monthly Cost €3/mo
consent.cookiebot.com
Other
Optional
Execution 199ms
Transfer 36 KB
Unused 64%
Monthly Cost €2/mo
Google Tag Manager
Tag Manager
Optional
Execution 158ms
Transfer 168 KB
Unused 51%
Monthly Cost €2/mo
customer.cludo.com
Other
Optional
Execution 143ms
Transfer 75 KB
Unused 66%
Monthly Cost €2/mo
www.helsinki.fi
Other
Optional
Execution 133ms
Transfer 1 KB
Monthly Cost €1/mo
d2oarllo6tn86.cloudfront.net
Other
Optional
Execution 81ms
Transfer 50 KB
Monthly Cost €1/mo
www.helsinki.fi
Other
Optional
Execution 58ms
Transfer 40 KB
Monthly Cost €1/mo
www.helsinki.fi
Other
Optional
Execution 52ms
Transfer 38 KB
Unused 74%
Monthly Cost €1/mo

These scripts may cost more than they're worth

  • www.helsinki.fi adds 807ms and costs ~€9/month
  • www.helsinki.fi adds 676ms and costs ~€7/month
  • Unattributable adds 654ms and costs ~€7/month
  • consent.cookiebot.com adds 620ms and costs ~€7/month
  • www.helsinki.fi adds 373ms and costs ~€4/month
  • d2oarllo6tn86.cloudfront.net adds 286ms 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

www.helsinki.fi takes 807ms 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.helsinki.fi takes 676ms 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 654ms 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 620ms 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.helsinki.fi takes 373ms 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

d2oarllo6tn86.cloudfront.net takes 286ms 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

64% of consent.cookiebot.com'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

51% of Google Tag Manager'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

66% of customer.cludo.com'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

74% of www.helsinki.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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