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Performance

· 17 checks — Lighthouse + waterfall + sustainability rolled into one auditable list.
SCORE
71
GRADE
C
FIX
5
REVIEW
2
PASS
8
INFO
2

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

Mobile Desktop
41
Performance Overall performance score (0–100) based on Core Web Vitals and other metrics. 90+ is good.
84
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.
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.

7.72 s

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

19.94 s

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

554 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.

11.64 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.

24.36 s

Page Load Progression

881 ms
1.8 s
2.6 s
3.5 s
4.4 s
5.3 s
6.2 s
7.0 s
Checks
17
8 PASS 2 REVIEW 5 FIX
F
Page Weight Budget
Action
4.3 MB transferred, 204 requests
FIX
4.3 MB transferred, 204 requests
Critical::
Page weighs 5.8 MB (4.3 MB transferred)
Warning::
Images are 3.5 MB — compress or use modern formats
Convert images to WebP/AVIF and resize to display dimensions to reduce transfer size.
Got: 3.5 MB
Warning::
JavaScript is 562 KB — consider code splitting or lazy loading
Large JavaScript bundles delay interactivity. Split code by route or defer non-critical scripts.
Got: 562 KB
Warning::
204 HTTP requests — consider bundling or reducing
Each request adds latency. Bundle small files, use sprites, or eliminate unnecessary requests.
Info::
Estimated 0.91 g CO2 per page load
4.3 MB / 2.4 MB budget
4.3 MB transferred
204 requests
0.91 g CO2 per page load
Images 3.5 MiB 80%
JavaScript 562.3 KiB 13%
Fonts 149.2 KiB 3%
CSS 84.9 KiB 2%
HTML 44.5 KiB 1%
Other 33.3 KiB 1%
Other 3.3 KiB 0%
Other 638 B 0%
Other 20 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

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

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 (4.3 MiB of 4.3 MiB)
Info::
Third-party blocking time is low (0 ms)
100%
First-party Third-party
F
JS Execution Cost
Action
5407ms total JS execution
FIX
5407ms total JS execution
Warning::
Unattributable: 1347ms CPU time
Warning::
https://www.uw.edu.pl/: 1100ms CPU time
Warning::
https://www.uw.edu.pl/wp-content/themes/uw/library...: 789ms CPU time
Warning::
https://www.uw.edu.pl/wp-content/themes/uw/library...: 643ms CPU time
Warning::
https://cdn.viglink.com/api/vglnk.js: 434ms CPU time
Warning::
Third-party scripts: 5407ms (100% of total)

Main Thread Breakdown

Script Evaluation 41% Other 34% Style & Layout 15% Script Parsing & Compilation 4% Rendering 4%
ScriptTotalScriptingParse/CompileParty
Unattributable1347ms89ms0ms3rd
https://www.uw.edu.pl/1100ms156ms11ms3rd
https://www.uw.edu.pl/wp-content/themes/uw/library/js/main.min.js?15032024789ms228ms44ms3rd
https://www.uw.edu.pl/wp-content/themes/uw/library/js/jquery/jquery-1.10.2.min.js643ms447ms18ms3rd
https://cdn.viglink.com/api/vglnk.js434ms358ms15ms3rd
https://cdn.openshareweb.com/v2/71c6eb22/main.js358ms318ms16ms3rd
https://www.googletagmanager.com/gtag/js?id=G-B37WHT4SG8&cx=c&_slc=1256ms192ms62ms3rd
https://commerce-js.sovrn.co/commerce-js.iife.js142ms123ms19ms3rd
https://cdn.shareaholic.net/assets/pub/shareaholic.js117ms95ms3ms3rd
https://www.google-analytics.com/analytics.js112ms95ms5ms3rd

Showing top 10 of 11 scripts

D
JS Bundles
Action
36 scripts, 195 KB unused
FIX
36 scripts, 195 KB unused
Warning::
https://www.uw.edu.pl/wp-content/themes/uw/library...: 75 KB unused (74%)
Consider code splitting or tree shaking to reduce unused code.
Warning::
https://www.uw.edu.pl/wp-content/themes/uw/library...: unminified — 31 KB could be saved
Warning::
https://www.googletagmanager.com/gtag/js?id=G-B37W...: 64 KB unused (44%)
Consider code splitting or tree shaking to reduce unused code.
Warning::
https://commerce-js.sovrn.co/commerce-js.iife.js: 30 KB unused (62%)
Consider code splitting or tree shaking to reduce unused code.
Warning::
https://ajax.googleapis.com/ajax/libs/angularjs/1....: 25 KB unused (89%)
Consider code splitting or tree shaking to reduce unused code.
Info::
Total unused JavaScript: 195 KB
195 KB unused JavaScript

Downloaded but never executed on this page.

ScriptSizeUnusedMinifiedParty
https://www.uw.edu.pl/wp-content/themes/uw/library/js/main.min.js?15032024102 KB75 KB (74%)✗3rd
https://www.googletagmanager.com/gtag/js?id=G-B37WHT4SG8&cx=c&_slc=1148 KB64 KB (44%)✓3rd
https://commerce-js.sovrn.co/commerce-js.iife.js49 KB30 KB (62%)✓3rd
https://ajax.googleapis.com/ajax/libs/angularjs/1.0.1/angular.min.js29 KB25 KB (89%)✓3rd
https://partner.shareaholic.com/partners.js?location=https%3A%2F%2Fwww.uw.edu.pl%2F&cl=pl-PL&id_sync=6daff9f7-9aba-42a0-8922-e3be38f41791&pvs=1&site=e0c9d46bb55de0ed369ee3dd661e103e1 KB—✓3rd
https://www.uw.edu.pl/wp-content/plugins/cookie-law-info/public/js/cookie-law-info-public.js7 KB—✓3rd
https://www.uw.edu.pl/wp-content/themes/uw/library/js/what-input.min.js2 KB—✓3rd
https://www.uw.edu.pl/wp-content/themes/uw/library/js/wcag.js3 KB—✓3rd
https://www.uw.edu.pl/wp-content/themes/uw/library/js/class/class.Core.js?150320242 KB—✓3rd
https://cdnjs.cloudflare.com/ajax/libs/jquery-mousewheel/3.0.6/jquery.mousewheel.min.js1 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

D
Page Weight Inventory
Action
204 resources · 4.3 MB · 195 KB savings available
FIX
204 resources · 4.3 MB · 195 KB savings available
Warning::
Page weight 3.3 MB over 1MB target
Got: 4.3 MB Expected: ≤ 1 MB
Info::
~195 KB of savings available
Warning::
203 third-party resources (100% of weight)
Info::
2 resources over 200KB
204 resources · 4.3 MiB · 203 third-party 3.3 MiB over 1MB target
Image 80% · 3.5 MiB
JavaScript 13% · 563.4 KiB
Font 3% · 149.2 KiB
CSS 2% · 84.9 KiB
Document 1% · 64.4 KiB
Other 0% · 8.7 KiB

~194.8 KiB of savings available

Remove unused JavaScript: 194.8 KiB
C
Image Optimization
Action
91 images, 0 KB saveable
REVIEW
91 images, 0 KB saveable
Warning::
https://www.uw.edu.pl/wp-content/themes/uw/library... is missing width/height — may cause layout shift
Set explicit width and height to prevent CLS.
Warning::
https://www.uw.edu.pl/wp-content/uploads/2019/02/l... is missing width/height — may cause layout shift
Set explicit width and height to prevent CLS.
Warning::
https://www.uw.edu.pl/wp-content/uploads/2026/02/t... is missing width/height — may cause layout shift
Set explicit width and height to prevent CLS.
Warning::
https://www.uw.edu.pl/wp-content/themes/uw/library... is missing width/height — may cause layout shift
Set explicit width and height to prevent CLS.
Warning::
https://www.uw.edu.pl/wp-content/uploads/2020/11/w... is missing width/height — may cause layout shift
Set explicit width and height to prevent CLS.
Warning::
https://www.uw.edu.pl/wp-content/uploads/2026/04/z... is missing width/height — may cause layout shift
Set explicit width and height to prevent CLS.
Warning::
https://www.uw.edu.pl/wp-content/uploads/2022/03/h... is missing width/height — may cause layout shift
Set explicit width and height to prevent CLS.
Warning::
https://www.uw.edu.pl/wp-content/uploads/2017/07/l... is missing width/height — may cause layout shift
Set explicit width and height to prevent CLS.
Warning::
https://www.uw.edu.pl/wp-content/uploads/2025/11/4... is missing width/height — may cause layout shift
Set explicit width and height to prevent CLS.
Warning::
https://www.uw.edu.pl/wp-content/uploads/2024/09/k... is missing width/height — may cause layout shift
Set explicit width and height to prevent CLS.
Warning::
https://www.uw.edu.pl/wp-content/uploads/2023/06/i... is missing width/height — may cause layout shift
Set explicit width and height to prevent CLS.
Warning::
https://www.uw.edu.pl/wp-content/uploads/2025/03/t... is missing width/height — may cause layout shift
Set explicit width and height to prevent CLS.
Warning::
https://www.uw.edu.pl/wp-content/uploads/2025/02/i... is missing width/height — may cause layout shift
Set explicit width and height to prevent CLS.
Warning::
https://www.uw.edu.pl/wp-content/uploads/2026/02/z... is missing width/height — may cause layout shift
Set explicit width and height to prevent CLS.
91 images 3.5 MB
0 oversized -0 KB
90 legacy format
14 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

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
4 fonts (149 KB)
PASS
4 fonts (149 KB)
Info::
4 font(s) use font-display: swap (FOUT risk but functional)

Web fonts

4

149 KB total

Render-blocking

0

of 4

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 14.0 s 16.0 s 18.0 s 20.0 s FCP 7.7 s LCP 19.9 shttps://fonts.gstatic.com/s/opensans/v44/memvYaGs126MiZpBA-UvWbX2vVnXBbObj2OVTS-mu0SC55I.woff2memvYaGs126MiZpBA-UvWbX... https://fonts.gstatic.com/s/opensans/v44/memvYaGs126MiZpBA-UvWbX2vVnXBbObj2OVTS-mu0SC55I.woff2 — 42.0 KiB — 8 ms — font-display: swaphttps://www.uw.edu.pl/wp-content/themes/uw/library/fonts/icomoon.wofficomoon.woff https://www.uw.edu.pl/wp-content/themes/uw/library/fonts/icomoon.woff — 1.4 KiB — 321 ms — font-display: swaphttps://fonts.gstatic.com/s/opensans/v44/memvYaGs126MiZpBA-UvWbX2vVnXBbObj2OVTSGmu0SC55K5gw.woff2memvYaGs126MiZpBA-UvWbX... https://fonts.gstatic.com/s/opensans/v44/memvYaGs126MiZpBA-UvWbX2vVnXBbObj2OVTSGmu0SC55K5gw.woff2 — 29.9 KiB — 13 ms — font-display: swaphttps://maxcdn.bootstrapcdn.com/font-awesome/4.7.0/fonts/fontawesome-webfont.woff2?v=4.7.0fontawesome-webfont.woff2 https://maxcdn.bootstrapcdn.com/font-awesome/4.7.0/fonts/fontawesome-webfont.woff2?v=4.7.0 — 75.9 KiB — 23 ms — font-display: swap
memvYaGs126MiZpBA-UvWbX... woff2 swap
Size 42 KB
Load time 8 ms
Start 3.2 s
Risk FOUT — text flashes from fallback to web font
icomoon.woff woff swap
Size 1 KB
Load time 321 ms
Start 3.4 s
Risk FOUT — text flashes from fallback to web font
  • Convert to woff2 for ~30% smaller file size
memvYaGs126MiZpBA-UvWbX... woff2 swap
Size 30 KB
Load time 13 ms
Start 3.4 s
Risk FOUT — text flashes from fallback to web font
fontawesome-webfont.woff2 woff2 swap
Size 76 KB
Load time 23 ms
Start 3.4 s
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)
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
9 hints, 0 missing preconnects
PASS
9 hints, 0 missing preconnects
Info::
Page uses 9 resource hint(s)

Current Resource Hints

preconnect
—
preload
1
dns-prefetch
8
prefetch
—

9 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
A
HTTP Caching
max-age=3600 (1 hour)
PASS
max-age=3600 (1 hour)
Info::
Cache-Control header is set
Got: max-age=3600
Info::
Effective TTL: 1 hour (max-age=3600)
Info::
No ETag or Last-Modified header
Conditional requests (304 Not Modified) are not possible without validators.
Cache-Control

max-age=3600

DirectiveValueMeaning
max-age3600Cache for 1 hour
Effective TTL: 3600 seconds
Network Waterfall
204 requests over 10994ms
INFO
0 ms 2.0 s 4.0 s 6.0 s 8.0 s 10.0 s 12.0 s 14.0 s 16.0 s 18.0 s 20.0 s FCP 7.7 s LCP 19.9 shttps://uw.edu.pl// https://uw.edu.pl/ — 301 — 539 B — 784 ms — http/1.1https://www.uw.edu.pl/www.uw.edu.pl/ https://www.uw.edu.pl/ — 200 — 44.5 KiB — 1.4 s — http/1.1https://maxcdn.bootstrapcdn.com/font-awesome/4.7.0/css/font-awesome.min.cssmaxcdn.bootstrapcdn.com/font-awesom... https://maxcdn.bootstrapcdn.com/font-awesome/4.7.0/css/font-awesome.min.css — 200 — 7.4 KiB — 36 ms — h3https://cdn.shareaholic.net/assets/pub/shareaholic.jscdn.shareaholic.net/assets/pub/shar... https://cdn.shareaholic.net/assets/pub/shareaholic.js — 200 — 4.7 KiB — 50 ms — h2https://www.uw.edu.pl/wp-content/plugins/cookie-law-info/public/css/cookie-law-info-public.csswww.uw.edu.pl/wp-content/plugins/co... https://www.uw.edu.pl/wp-content/plugins/cookie-law-info/public/css/cookie-law-info-public.css — 200 — 1.3 KiB — 297 ms — http/1.1https://www.uw.edu.pl/wp-content/plugins/cookie-law-info/public/css/cookie-law-info-gdpr.csswww.uw.edu.pl/wp-content/plugins/co... https://www.uw.edu.pl/wp-content/plugins/cookie-law-info/public/css/cookie-law-info-gdpr.css — 200 — 6.3 KiB — 461 ms — http/1.1https://www.uw.edu.pl/wp-content/plugins/sitemap/css/page-list.csswww.uw.edu.pl/wp-content/plugins/si... https://www.uw.edu.pl/wp-content/plugins/sitemap/css/page-list.css — 200 — 1.0 KiB — 467 ms — http/1.1https://www.uw.edu.pl/wp-includes/js/thickbox/thickbox.csswww.uw.edu.pl/wp-includes/js/thickb... https://www.uw.edu.pl/wp-includes/js/thickbox/thickbox.css — 200 — 1.4 KiB — 468 ms — http/1.1https://ajax.googleapis.com/ajax/libs/jqueryui/1.11.4/themes/smoothness/jquery-ui.cssajax.googleapis.com/ajax/libs/jquer... https://ajax.googleapis.com/ajax/libs/jqueryui/1.11.4/themes/smoothness/jquery-ui.css — 200 — 8.5 KiB — 40 ms — h2https://www.uw.edu.pl/wp-content/plugins/newsletter/subscription/style.csswww.uw.edu.pl/wp-content/plugins/ne... https://www.uw.edu.pl/wp-content/plugins/newsletter/subscription/style.css — 200 — 1.9 KiB — 472 ms — http/1.1https://www.uw.edu.pl/wp-content/themes/uw/library/css/main.css?15032024www.uw.edu.pl/wp-content/themes/uw/... https://www.uw.edu.pl/wp-content/themes/uw/library/css/main.css?15032024 — 200 — 47.3 KiB — 949 ms — http/1.1https://www.uw.edu.pl/wp-content/themes/uw/library/css/custom-pi.css?15032024www.uw.edu.pl/wp-content/themes/uw/... https://www.uw.edu.pl/wp-content/themes/uw/library/css/custom-pi.css?15032024 — 200 — 2.8 KiB — 475 ms — http/1.1https://www.uw.edu.pl/wp-content/themes/uw/library/js/jquery/jquery-1.10.2.min.jswww.uw.edu.pl/wp-content/themes/uw/... https://www.uw.edu.pl/wp-content/themes/uw/library/js/jquery/jquery-1.10.2.min.js — 200 — 41.9 KiB — 1.1 s — http/1.1https://www.uw.edu.pl/wp-content/plugins/cookie-law-info/public/js/cookie-law-info-public.jswww.uw.edu.pl/wp-content/plugins/co... https://www.uw.edu.pl/wp-content/plugins/cookie-law-info/public/js/cookie-law-info-public.js — 200 — 7.1 KiB — 633 ms — http/1.1https://www.uw.edu.pl/wp-content/themes/uw/library/js/wcag.jswww.uw.edu.pl/wp-content/themes/uw/... https://www.uw.edu.pl/wp-content/themes/uw/library/js/wcag.js — 200 — 3.0 KiB — 626 ms — http/1.1https://www.uw.edu.pl/wp-content/themes/uw/library/js/what-input.min.jswww.uw.edu.pl/wp-content/themes/uw/... https://www.uw.edu.pl/wp-content/themes/uw/library/js/what-input.min.js — 200 — 2.4 KiB — 638 ms — http/1.1https://www.uw.edu.pl/wp-content/themes/uw/library/js/libs/modernizr.custom.min.jswww.uw.edu.pl/wp-content/themes/uw/... https://www.uw.edu.pl/wp-content/themes/uw/library/js/libs/modernizr.custom.min.js — 200 — 7.4 KiB — 642 ms — 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504 B — 108 ms — http/1.1https://fei.pro-market.net/engine?du=24;csync=C66522C2E7B048208A9B1E3239619BDF;mimetype=img;fei.pro-market.net/engine?du=24;csy... https://fei.pro-market.net/engine?du=24;csync=C66522C2E7B048208A9B1E3239619BDF;mimetype=img; — 302 — 770 B — 137 ms — h2https://loadm.exelator.com/load/?p=204&g=2191&simid=9FC1C52D9F774C1DA0C763CD006551C2&j=0loadm.exelator.com/load/?p=204&g=21... https://loadm.exelator.com/load/?p=204&g=2191&simid=9FC1C52D9F774C1DA0C763CD006551C2&j=0 — 302 — 884 B — 235 ms — h2https://ups.analytics.yahoo.com/ups/55964/sync?uid=5FEA7586D3D34041BE6FC64896A514ACups.analytics.yahoo.com/ups/55964/s... https://ups.analytics.yahoo.com/ups/55964/sync?uid=5FEA7586D3D34041BE6FC64896A514AC — 302 — 431 B — 101 ms — h2https://sync.bfmio.com/sync?pid=141&uid=E7E61919092C42DD8564A515EEDFE238sync.bfmio.com/sync?pid=141&uid=E7E... https://sync.bfmio.com/sync?pid=141&uid=E7E61919092C42DD8564A515EEDFE238 — 204 — 378 B — 246 ms — h2https://bcp.crwdcntrl.net/map/c=7625/tp=SIMP/tpid=9F7FFACE513B4775A90AA31F7F145800bcp.crwdcntrl.net/map/c=7625/tp=SIM... https://bcp.crwdcntrl.net/map/c=7625/tp=SIMP/tpid=9F7FFACE513B4775A90AA31F7F145800 — 302 — 292 B — 22 ms — h2https://ce.lijit.com/merge?pid=2&3pid=77DBC2BC33554D18BB408F2699D3694Dce.lijit.com/merge?pid=2&3pid=77DBC... https://ce.lijit.com/merge?pid=2&3pid=77DBC2BC33554D18BB408F2699D3694D — 302 — 385 B — 101 ms — h2https://idsync.rlcdn.com/419566.gif?partner_uid=392C8D6555CA44B6A8E6FB74269D5BDEidsync.rlcdn.com/419566.gif?partner... https://idsync.rlcdn.com/419566.gif?partner_uid=392C8D6555CA44B6A8E6FB74269D5BDE — 307 — 15 B — 65 ms — h3https://ib.adnxs.com/setuid?entity=66&code=C4FE3ECB288843B88A567699B8282A43ib.adnxs.com/setuid?entity=66&code=... https://ib.adnxs.com/setuid?entity=66&code=C4FE3ECB288843B88A567699B8282A43 — 200 — 923 B — 47 ms — h2https://pixel.rubiconproject.com/tap.php?v=6286&nid=2132&put=4E494A03235949899CB8005A25BDDC3E&expires=365pixel.rubiconproject.com/tap.php?v=... https://pixel.rubiconproject.com/tap.php?v=6286&nid=2132&put=4E494A03235949899CB8005A25BDDC3E&expires=365 — 200 — 1.4 KiB — 76 ms — http/1.1https://us-u.openx.net/w/1.0/sd?id=537072966&val=A56BB1C24071400B9DB4CCFCD897509Fus-u.openx.net/w/1.0/sd?id=53707296... https://us-u.openx.net/w/1.0/sd?id=537072966&val=A56BB1C24071400B9DB4CCFCD897509F — 302 — 333 B — 107 ms — h2https://cm.g.doubleclick.net/pixel?google_nid=simplifi&google_cm=&google_sc=&google_tc=cm.g.doubleclick.net/pixel?google_n... https://cm.g.doubleclick.net/pixel?google_nid=simplifi&google_cm=&google_sc=&google_tc= — 302 — 88 B — 87 ms — h2https://x.bidswitch.net/ul_cb/sync?dsp_id=518&user_id=B012AC4C11FD4998B70925568E80DAF5x.bidswitch.net/ul_cb/sync?dsp_id=5... https://x.bidswitch.net/ul_cb/sync?dsp_id=518&user_id=B012AC4C11FD4998B70925568E80DAF5 — 302 — 96 B — 43 ms — h2https://bcp.crwdcntrl.net/map/ct=y/c=7625/tp=SIMP/tpid=9F7FFACE513B4775A90AA31F7F145800bcp.crwdcntrl.net/map/ct=y/c=7625/t... https://bcp.crwdcntrl.net/map/ct=y/c=7625/tp=SIMP/tpid=9F7FFACE513B4775A90AA31F7F145800 — 200 — 267 B — 16 ms — h2https://cs.media.net/cksync.php?cs=1&type=bs&ovsid=&gdpr=&gdpr_consent=&gpp=cs.media.net/cksync.php?cs=1&type=b... https://cs.media.net/cksync.php?cs=1&type=bs&ovsid=&gdpr=&gdpr_consent=&gpp= — 200 — 315 B — 76 ms — h2https://idsync.rlcdn.com/1000.gif?memo=CO7NGRIrCicIARDuJBogMzkyQzhENjU1NUNBNDRCNkE4RTZGQjc0MjY5RDVCREUQABoNCJzmpM8GEgUI6AcQAEIASgAidsync.rlcdn.com/1000.gif?memo=CO7N... https://idsync.rlcdn.com/1000.gif?memo=CO7NGRIrCicIARDuJBogMzkyQzhENjU1NUNBNDRCNkE4RTZGQjc0MjY5RDVCREUQABoNCJzmpM8GEgUI6AcQAEIASgA — 307 — 15 B — 61 ms — h3https://d.agkn.com/pixel/10751/?che=1776890652176&ip=92.38.149.11&l1=https%3A%2F%2Fum.simpli.fi%2Faa_px%3Fsk%3D208020805590012661189d.agkn.com/pixel/10751/?che=1776890... https://d.agkn.com/pixel/10751/?che=1776890652176&ip=92.38.149.11&l1=https%3A%2F%2Fum.simpli.fi%2Faa_px%3Fsk%3D208020805590012661189 — 302 — 534 B — 61 ms — h2https://um.simpli.fi/g_match?id=&google_error=3um.simpli.fi/g_match?id=&google_err... https://um.simpli.fi/g_match?id=&google_error=3 — 204 — 521 B — 23 ms — h2https://ups.analytics.yahoo.com/ups/55964/sync?uid=5FEA7586D3D34041BE6FC64896A514AC&verify=trueups.analytics.yahoo.com/ups/55964/s... https://ups.analytics.yahoo.com/ups/55964/sync?uid=5FEA7586D3D34041BE6FC64896A514AC&verify=true — -1 — 0 B — 33 ms — https://ce.lijit.com/merge?pid=2&3pid=77DBC2BC33554D18BB408F2699D3694D&dnr=1ce.lijit.com/merge?pid=2&3pid=77DBC... https://ce.lijit.com/merge?pid=2&3pid=77DBC2BC33554D18BB408F2699D3694D&dnr=1 — 204 — 317 B — 25 ms — h2https://us-u.openx.net/w/1.0/sd?cc=1&id=537072966&val=A56BB1C24071400B9DB4CCFCD897509Fus-u.openx.net/w/1.0/sd?cc=1&id=537... https://us-u.openx.net/w/1.0/sd?cc=1&id=537072966&val=A56BB1C24071400B9DB4CCFCD897509F — 200 — 171 B — 41 ms — h2https://pixel.tapad.com/idsync/ex/receive/check?partner_id=2305&partner_device_id=14E66DEAF11E46FD9A6795C9A5524013pixel.tapad.com/idsync/ex/receive/c... https://pixel.tapad.com/idsync/ex/receive/check?partner_id=2305&partner_device_id=14E66DEAF11E46FD9A6795C9A5524013 — 200 — 426 B — 44 ms — h2https://pippio.com/api/sync?pid=5324&_=2pippio.com/api/sync?pid=5324&_=2 https://pippio.com/api/sync?pid=5324&_=2 — 200 — 570 B — 93 ms — h2https://fei.pro-market.net/engine?du=24;csync=C66522C2E7B048208A9B1E3239619BDF;mimetype=img;srfei.pro-market.net/engine?du=24;csy... https://fei.pro-market.net/engine?du=24;csync=C66522C2E7B048208A9B1E3239619BDF;mimetype=img;sr — 200 — 447 B — 77 ms — h2https://sync.1rx.io/usersync/simplifi/B5F59AF45BE847DFBFDAAEE0FB18627D?zcc=1&cb=1776890652196sync.1rx.io/usersync/simplifi/B5F59... https://sync.1rx.io/usersync/simplifi/B5F59AF45BE847DFBFDAAEE0FB18627D?zcc=1&cb=1776890652196 — 200 — 154 B — 72 ms — h2https://sync.intentiq.com/profiles_engine/ProfilesEngineServlet?at=20&dpi=2124307461&pcid=1530481A34DC4962B3814A3B10A281E4&ckls=true&ci=IWqv18txdZ&nc=false&trid=586870665sync.intentiq.com/profiles_engine/P... https://sync.intentiq.com/profiles_engine/ProfilesEngineServlet?at=20&dpi=2124307461&pcid=1530481A34DC4962B3814A3B10A281E4&ckls=true&ci=IWqv18txdZ&nc=false&trid=586870665 — 200 — 895 B — 74 ms — h2https://pixel.tapad.com/idsync/ex/receive?partner_id=3372&partner_device_id=b7f83df075pixel.tapad.com/idsync/ex/receive?p... https://pixel.tapad.com/idsync/ex/receive?partner_id=3372&partner_device_id=b7f83df075 — 302 — 25 B — 40 ms — h3https://um.simpli.fi/aa_px?sk=208020805590012661189um.simpli.fi/aa_px?sk=2080208055900... https://um.simpli.fi/aa_px?sk=208020805590012661189 — 302 — 518 B — 22 ms — h2https://um.simpli.fi/empty.gifum.simpli.fi/empty.gif https://um.simpli.fi/empty.gif — 200 — 560 B — 26 ms — h2https://pixel.tapad.com/idsync/ex/receive/check?partner_id=3372&partner_device_id=b7f83df075pixel.tapad.com/idsync/ex/receive/c... https://pixel.tapad.com/idsync/ex/receive/check?partner_id=3372&partner_device_id=b7f83df075 — 302 — 26 B — 39 ms — h3https://ps.eyeota.net/match/bounce/?bid=irm51m1&uid=9B9D970F04874B639629554FBF553379ps.eyeota.net/match/bounce/?bid=irm... https://ps.eyeota.net/match/bounce/?bid=irm51m1&uid=9B9D970F04874B639629554FBF553379 — 200 — 354 B — 81 ms — http/1.1https://match.adsrvr.org/track/cmf/generic?ttd_pid=tapad&ttd_tpi=1&ttd_puid=8956d3f9-54ba-4e75-ab9a-d501aff56325%252C%252C&gdpr=0&gdpr_consent=match.adsrvr.org/track/cmf/generic?... https://match.adsrvr.org/track/cmf/generic?ttd_pid=tapad&ttd_tpi=1&ttd_puid=8956d3f9-54ba-4e75-ab9a-d501aff56325%252C%252C&gdpr=0&gdpr_consent= — 302 — 373 B — 76 ms — h2https://eb2.3lift.com/xuid?ld=1&mid=7969&xuid=D2F5937E9F9D4F82A0916CFEAFD53E58&dongle=yf3&gdpr=0&cmp_cs=&us_privacy=eb2.3lift.com/xuid?ld=1&mid=7969&xu... https://eb2.3lift.com/xuid?ld=1&mid=7969&xuid=D2F5937E9F9D4F82A0916CFEAFD53E58&dongle=yf3&gdpr=0&cmp_cs=&us_privacy= — 200 — 139 B — 74 ms — h2https://loadm.exelator.com/load/?p=204&g=2191&simid=9FC1C52D9F774C1DA0C763CD006551C2&j=0&xl8blockcheck=1loadm.exelator.com/load/?p=204&g=21... https://loadm.exelator.com/load/?p=204&g=2191&simid=9FC1C52D9F774C1DA0C763CD006551C2&j=0&xl8blockcheck=1 — 204 — 324 B — 71 ms — h2https://match.adsrvr.org/track/cmb/generic?ttd_pid=tapad&ttd_tpi=1&ttd_puid=8956d3f9-54ba-4e75-ab9a-d501aff56325%252C%252C&gdpr=0&gdpr_consent=match.adsrvr.org/track/cmb/generic?... https://match.adsrvr.org/track/cmb/generic?ttd_pid=tapad&ttd_tpi=1&ttd_puid=8956d3f9-54ba-4e75-ab9a-d501aff56325%252C%252C&gdpr=0&gdpr_consent= — 200 — 254 B — 24 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 5407ms · 489KB · zł133/mo
Unattributable
Other
Costly
Execution 1347ms
Transfer 0 KB
Monthly Cost zł33/mo
www.uw.edu.pl
Other
Costly
Execution 1100ms
Transfer 44 KB
Monthly Cost zł27/mo
www.uw.edu.pl
Other
Costly
Execution 789ms
Transfer 102 KB
Unused 74%
Monthly Cost zł19/mo
www.uw.edu.pl
Other
Costly
Execution 643ms
Transfer 42 KB
Monthly Cost zł16/mo
cdn.viglink.com
Other
Costly
Execution 434ms
Transfer 29 KB
Monthly Cost zł11/mo
cdn.openshareweb.com
Other
Costly
Execution 358ms
Transfer 41 KB
Monthly Cost zł9/mo
Google Tag Manager
Tag Manager
Costly
Execution 256ms
Transfer 148 KB
Unused 44%
Monthly Cost zł6/mo
commerce-js.sovrn.co
Other
Optional
Execution 142ms
Transfer 49 KB
Unused 62%
Monthly Cost zł4/mo
cdn.shareaholic.net
Other
Optional
Execution 117ms
Transfer 5 KB
Monthly Cost zł3/mo
Google Analytics
Analytics
Optional
Execution 112ms
Transfer 21 KB
Monthly Cost zł3/mo
www.uw.edu.pl
Other
Optional
Execution 109ms
Transfer 7 KB
Monthly Cost zł3/mo

These scripts may cost more than they're worth

  • Unattributable adds 1347ms and costs ~zł33/month
  • www.uw.edu.pl adds 1100ms and costs ~zł27/month
  • www.uw.edu.pl adds 789ms and costs ~zł19/month
  • www.uw.edu.pl adds 643ms and costs ~zł16/month
  • cdn.viglink.com adds 434ms and costs ~zł11/month
  • cdn.openshareweb.com adds 358ms and costs ~zł9/month
  • Google Tag Manager adds 256ms and costs ~zł6/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 1347ms 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.uw.edu.pl takes 1100ms 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.uw.edu.pl takes 789ms 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

74% of www.uw.edu.pl'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

www.uw.edu.pl takes 643ms 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

cdn.viglink.com takes 434ms of CPU time. Consider loading it asynchronously or replacing it with a lighter alternative.

Why this matters

This script has high main-thread execution time — optimize hot paths or defer.

Source: web.dev

cdn.openshareweb.com takes 358ms 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 256ms 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

62% of commerce-js.sovrn.co'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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