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https://krakow.pl

Performance

· 15 checks — Lighthouse + waterfall + sustainability rolled into one auditable list.

SCORE

79

GRADE

C

FIX

3

REVIEW

4

PASS

6

INFO

2

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

76

Performance

96

Accessibility

100

Best Practices

100

SEO

First Contentful Paint First Contentful Paint — how long until the browser renders the first piece of content. Under 1.8s is good.

653 ms

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

1.65 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.

0.253

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

2.23 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.

1.72 s

Page Load Progression

406 ms

811 ms

1.2 s

1.6 s

2.0 s

2.4 s

2.8 s

3.2 s

Checks

15

6 PASS 4 REVIEW 3 FIX

F

Page Weight Budget

Action

2.7 MB transferred, 68 requests

FIX

2.7 MB transferred, 68 requests

Page weighs 3.4 MB (2.7 MB transferred)

Images are 2.3 MB — compress or use modern formats

Convert images to WebP/AVIF and resize to display dimensions to reduce transfer size.

Got: 2.3 MB

68 HTTP requests

Estimated 0.57 g CO2 per page load

2.7 MB transferred

68 requests

0.57 g CO2 per page load

Images 2.3 MiB 85%

JavaScript 203.6 KiB 7%

Fonts 173.0 KiB 6%

CSS 29.0 KiB 1%

HTML 18.6 KiB 1%

Other 1.4 KiB 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

D

Third-Party Impact

Action

84% third-party, 0 ms blocking

FIX

84% third-party, 0 ms blocking

Third-party code accounts for 84% of page weight (2.3 MiB of 2.7 MiB)

Third-party blocking time is low (0 ms)

16%

84%

First-party Third-party

D

Page Weight Inventory

Action

68 resources · 2.7 MB · 23 KB savings available

FIX

68 resources · 2.7 MB · 23 KB savings available

Page weight 1.7 MB over 1MB target

Got: 2.7 MB Expected: ≤ 1 MB

36 third-party resources (84% of weight)

2 resources over 200KB

68 resources · 2.7 MiB · 36 third-party 1.7 MiB over 1MB target

Image 85% · 2.3 MiB

JavaScript 7% · 203.6 KiB

Font 6% · 173.0 KiB

CSS 1% · 29.0 KiB

Document 1% · 18.6 KiB

~22.6 KiB of savings available

Remove unused JavaScript: 22.6 KiB

#	Resource	Type	Size	Cache	Unused	3rd party	Issues

68 resources			2.7 MiB

C

Image Optimization

Action

43 images, 0 KB saveable

REVIEW

43 images, 0 KB saveable

https://krakow.pl/build/img/bip_logo.svg is missing width/height — may cause layout shift

Set explicit width and height to prevent CLS.

https://krakow.pl/build/img/pogoda_dobry.svg is missing width/height — may cause layout shift

Set explicit width and height to prevent CLS.

https://krakow.pl/build/img/pause_icon.svg is missing width/height — may cause layout shift

Set explicit width and height to prevent CLS.

43 images 2.3 MB

0 oversized -0 KB

43 legacy format

3 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

B

JS Execution Cost

731ms total JS execution

REVIEW

731ms total JS execution

https://krakow.pl/: 234ms CPU time

Unattributable: 171ms CPU time

https://krakow.pl/build/7592.635850b7.js: 160ms CPU time

https://krakow.pl/build/index.a627e642.js: 114ms CPU time

https://krakow.pl/build/fonts.61187402.js: 52ms CPU time

Third-party scripts: 171ms (23% of total)

Main Thread Breakdown

Other 37% Style & Layout 26% Script Evaluation 24% Rendering 8% Script Parsing & Compilation 3%

Script	Total	Scripting	Parse/Compile	Party
https://krakow.pl/	234ms	8ms	1ms	1st
Unattributable	171ms	2ms	0ms	3rd
https://krakow.pl/build/7592.635850b7.js	160ms	38ms	3ms	1st
https://krakow.pl/build/index.a627e642.js	114ms	91ms	1ms	1st
https://krakow.pl/build/fonts.61187402.js	52ms	33ms	0ms	1st

C

Green Hosting

Action

Whether the site is served from green-energy infrastructure

REVIEW

Green Hosting

No green hosting detected

B

HTTP Caching

max-age=0, must-revalidate, private

REVIEW

max-age=0, must-revalidate, private

Cache-Control header is set

Got: max-age=0, must-revalidate, private

ETag present — enables conditional (304) responses

Cache-Control

max-age=0, must-revalidate, private

Directive	Value	Meaning
max-age	0	Cache for 0 seconds
must-revalidate	—	Must recheck with server after expiry
private	—	Only browser cache, not CDN/proxy

A+

Text Compression

All text resources are compressed

PASS

All text resources are compressed

All text resources are compressed

All text resources are properly compressed.

A+

Font Loading

4 fonts (173 KB)

PASS

4 fonts (173 KB)

4 font(s) use font-display: swap (FOUT risk but functional)

Web fonts

4

173 KB total

Render-blocking

0

of 4

Dominant font-display

swap

Most common across fonts

Font loading timeline

Transfer FOIT (block) FOUT (swap)

LatoLatin-Regular.f42ff... woff2 swap

Size 43 KB

Load time 736 ms

Start 2.0 s

Risk FOUT — text flashes from fallback to web font

LatoLatin-Black.88c59fe... woff2 swap

Size 43 KB

Load time 899 ms

Start 2.0 s

Risk FOUT — text flashes from fallback to web font

LatoLatin-Bold.b4fe4204... woff2 swap

Size 44 KB

Load time 1.1 s

Start 2.0 s

Risk FOUT — text flashes from fallback to web font

LatoLatin-Semibold.b8c0... woff2 swap

Size 44 KB

Load time 542 ms

Start 2.7 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+

JS Bundles

17 scripts, 23 KB unused

PASS

17 scripts, 23 KB unused

https://krakow.pl/build/4692.8f03972d.js: 23 KB unused (76%)

Consider code splitting or tree shaking to reduce unused code.

Total unused JavaScript: 23 KB

23 KB unused JavaScript

Downloaded but never executed on this page.

Script	Size	Unused	Minified	Party
https://krakow.pl/build/4692.8f03972d.js	30 KB	23 KB (76%)	✓	1st
https://krakow.pl/build/670.d9dff637.js	3 KB	—	✓	1st
https://krakow.pl/build/7185.0ab02b59.js	4 KB	—	✓	1st
https://krakow.pl/build/smog.7ad34dee.js	1 KB	—	✓	1st
https://krakow.pl/build/6429.93794f19.js	16 KB	—	✓	1st
https://krakow.pl/build/6817.ab96cc01.js	3 KB	—	✓	1st
https://krakow.pl/build/5266.fd7cf7eb.js	3 KB	—	✓	1st
https://krakow.pl/build/fonts.61187402.js	2 KB	—	✓	1st
https://krakow.pl/build/4263.4b7439be.js	4 KB	—	✓	1st
https://krakow.pl/build/8465.8c161ef5.js	20 KB	—	✓	1st

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

No caching issues found

All static resources have appropriate caching headers.

A+

Critical Rendering Path

No render-blocking resources

PASS

No render-blocking resources

No render-blocking resources detected

A+

Resource Hints

No optimization needed

PASS

No optimization needed

No resource hint issues

Network Waterfall

68 requests over 3383ms

INFO

HTML JavaScript CSS Images Fonts XHR/Fetch Other

Third-Party Script Cost

Per-script blocking time, transfer cost, and cache headers

INFO

23% of JavaScript execution is third-party

First-party Third-party 171ms · 0KB · zł4/mo

Script	Category	Execution	Transfer	Unused	Monthly Cost	Verdict
Unattributable Unattributable	Other	171ms	0 KB	—	zł4/mo	Optional

Unattributable

Other

Optional

Execution 171ms

Transfer 0 KB

Monthly Cost zł4/mo

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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