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https://stib-mivb.brussels

Performance

· 22 checks — Lighthouse + waterfall + sustainability rolled into one auditable list.
SCORE
73
GRADE
C
FIX
4
REVIEW
7
PASS
8
INFO
3

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

Mobile Desktop
64
Performance Overall performance score (0–100) based on Core Web Vitals and other metrics. 90+ is good.
72
Accessibility Measures how accessible the page is for users with disabilities. Checks color contrast, ARIA labels, and semantic HTML.
81
Best Practices Checks for modern web development best practices including HTTPS, no console errors, and secure JavaScript.
92
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.

1.82 s

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

2.00 s

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

336 ms

Cumulative Layout Shift Cumulative Layout Shift — measures visual stability. How much the page layout shifts during loading. Under 0.1 is good.

0.001

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

2.60 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.

5.56 s

Page Load Progression

656 ms
1.3 s
2.0 s
2.6 s
3.3 s
3.9 s
4.6 s
5.2 s
Checks
22
8 PASS 7 REVIEW 4 FIX
F
Page Weight Budget
Action
4.8 MB transferred, 82 requests
FIX
4.8 MB transferred, 82 requests
Critical::
Page weighs 18.9 MB (4.8 MB transferred)
Warning::
JavaScript is 3.5 MB — consider code splitting or lazy loading
Large JavaScript bundles delay interactivity. Split code by route or defer non-critical scripts.
Got: 3.5 MB
Info::
Fonts are 293 KB — consider subsetting or using system fonts
Subset fonts to include only used characters, or switch to system font stacks.
Got: 293 KB
Info::
82 HTTP requests
Info::
Estimated 1.0 g CO2 per page load
4.8 MB / 2.4 MB budget
4.8 MB transferred
82 requests
1.0 g CO2 per page load
JavaScript 3.5 MiB 73%
Images 829.0 KiB 17%
Fonts 293.0 KiB 6%
CSS 100.2 KiB 2%
Other 66.0 KiB 1%
HTML 10.3 KiB 0%
Other 5.2 KiB 0%
Other 4.0 KiB 0%
Other 1.3 KiB 0%
Other 0 B 0%
0 2.4 MB 4.9 MB
Over 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

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 (4.8 MiB of 4.8 MiB)
Info::
Third-party blocking time is low (0 ms)
100%
First-party Third-party
F
JS Bundles
Action
23 scripts, 2.9 MB unused
FIX
23 scripts, 2.9 MB unused
Warning::
https://www.stib-mivb.be/modules/stibmivb-template...: 681 KB unused (70%)
Consider code splitting or tree shaking to reduce unused code.
Warning::
https://www.stib-mivb.be/modules/stibmivb-template...: unminified — 320 KB could be saved
Warning::
https://www.stib-mivb.be/modules/stibmivb-template...: 681 KB unused (70%)
Consider code splitting or tree shaking to reduce unused code.
Warning::
https://www.stib-mivb.be/modules/stibmivb-template...: unminified — 320 KB could be saved
Warning::
https://www.stib-mivb.be/modules/stibmivb-template...: 539 KB unused (49%)
Consider code splitting or tree shaking to reduce unused code.
Warning::
https://www.stib-mivb.be/modules/stibmivb-template...: 539 KB unused (49%)
Consider code splitting or tree shaking to reduce unused code.
Warning::
https://tracking.stib-mivb.be/gtag/js?id=G-XXXXXXX...: 196 KB unused (51%)
Consider code splitting or tree shaking to reduce unused code.
Info::
Total unused JavaScript: 2.9 MB
3010 KB unused JavaScript

Downloaded but never executed on this page.

ScriptSizeUnusedMinifiedParty
https://www.stib-mivb.be/modules/stibmivb-template/javascript/vendors.js972 KB681 KB (70%)✗3rd
https://www.stib-mivb.be/modules/stibmivb-template/javascript/vendors.js0 KB681 KB (70%)✗3rd
https://www.stib-mivb.be/modules/stibmivb-template/javascript/main-rrfkY9Wl.js0 KB539 KB (49%)✓3rd
https://www.stib-mivb.be/modules/stibmivb-template/javascript/main-rrfkY9Wl.js1110 KB539 KB (49%)✓3rd
https://tracking.stib-mivb.be/gtag/js?id=G-XXXXXXXXXX&cx=c&gtm=4e6562&sign=2e420cca6fb36d0d41c922628e90ae131946b3f8600ac22d7bc6ecce1beb8b7c_20260510381 KB196 KB (51%)✓3rd
https://tracking.stib-mivb.be/gtm.js?id=GTM-NR8C6F27&gtm_auth=g3wZAhZGvfleAd4TmVXo8g&&gtm_preview=env-1&gtm_cookies_win=x534 KB190 KB (36%)✓3rd
https://www.googletagmanager.com/gtag/js?id=DC-4708247&cx=c&gtm=4e6562&sign=2e420cca6fb36d0d41c922628e90ae131946b3f8600ac22d7bc6ecce1beb8b7c_20260510130 KB60 KB (46%)✓3rd
https://www.googletagmanager.com/gtag/js?id=AW-875372945&cx=c&gtm=4e6562&sign=2e420cca6fb36d0d41c922628e90ae131946b3f8600ac22d7bc6ecce1beb8b7c_20260510145 KB52 KB (36%)✓3rd
https://connect.facebook.net/signals/config/537872945975515?v=2.9.313&r=stable&domain=www.stib-mivb.be&hme=97937018cefade17726f0472876fc101316b2ce9008a35a6a5a7977d7436151a&ex_m=104%2C205%2C154%2C22%2C72%2C73%2C145%2C68%2C67%2C11%2C162%2C90%2C16%2C138%2C48%2C146%2C77%2C112%2C47%2C127%2C39%2C75%2C78%2C134%2C159%2C164%2C8%2C4%2C5%2C7%2C6%2C3%2C91%2C101%2C165%2C170%2C219%2C62%2C186%2C187%2C55%2C276%2C30%2C74%2C231%2C230%2C229%2C23%2C33%2C103%2C61%2C10%2C63%2C97%2C98%2C99%2C105%2C130%2C31%2C29%2C132%2C133%2C129%2C128%2C155%2C76%2C158%2C156%2C157%2C50%2C60%2C123%2C15%2C161%2C45%2C263%2C264%2C262%2C26%2C27%2C28%2C18%2C20%2C44%2C40%2C42%2C41%2C83%2C92%2C96%2C110%2C144%2C147%2C46%2C111%2C24%2C21%2C119%2C69%2C36%2C149%2C148%2C150%2C141%2C139%2C25%2C35%2C59%2C109%2C160%2C70%2C17%2C152%2C114%2C81%2C66%2C19%2C85%2C86%2C116%2C84%2C136%2C135%2C34%2C278%2C293%2C212%2C201%2C202%2C200%2C296%2C288%2C52%2C213%2C107%2C131%2C80%2C121%2C54%2C49%2C113%2C120%2C126%2C58%2C64%2C151%2C115%2C37%2C32%2C53%2C56%2C100%2C163%2C1%2C124%2C14%2C122%2C12%2C2%2C57%2C93%2C65%2C118%2C89%2C88%2C166%2C167%2C94%2C95%2C9%2C125%2C102%2C51%2C142%2C87%2C79%2C71%2C117%2C106%2C43%2C143%2C0%2C82%2C137%2C140%2C153%2C38%2C108%2C13%2C168125 KB35 KB (28%)✓3rd
https://connect.facebook.net/en_US/fbevents.js97 KB35 KB (36%)✓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

F
Page Weight Inventory
Action
82 resources · 4.8 MB · 2.9 MB savings available
FIX
82 resources · 4.8 MB · 2.9 MB savings available
Warning::
Page weight 4.8 MB exceeds 1 MB target by 3.8 MB
Got: 4.8 MB Expected: ≤ 1 MB
Info::
~2.9 MB of savings available
Warning::
81 third-party resources (100% of weight)
Info::
5 resources over 200KB
82 resources · 4.8 MiB · 81 third-party 3.8 MiB over 1MB target
JavaScript 73% · 3.5 MiB
Image 17% · 831.7 KiB
Font 6% · 293.0 KiB
CSS 3% · 164.6 KiB
Document 0% · 10.4 KiB
Other 0% · 9.3 KiB

~2.9 MiB of savings available

Remove unused JavaScript: 2.9 MiB
C
Image Optimization
Action
22 images, 0 KB saveable
REVIEW
22 images, 0 KB saveable
Warning::
https://www.stib-mivb.be/files/live/sites/STIBMIVB... is missing width/height — may cause layout shift
Set explicit width and height to prevent CLS.
Warning::
https://www.stib-mivb.be/files/live/sites/STIBMIVB... is missing width/height — may cause layout shift
Set explicit width and height to prevent CLS.
Warning::
https://www.stib-mivb.be/files/live/sites/STIBMIVB... is missing width/height — may cause layout shift
Set explicit width and height to prevent CLS.
Warning::
https://www.stib-mivb.be/modules/stibmivb-core/ima... is missing width/height — may cause layout shift
Set explicit width and height to prevent CLS.
Warning::
https://www.stib-mivb.be/files/live/sites/STIBMIVB... is missing width/height — may cause layout shift
Set explicit width and height to prevent CLS.
Warning::
https://www.stib-mivb.be/files/live/sites/STIBMIVB... is missing width/height — may cause layout shift
Set explicit width and height to prevent CLS.
Warning::
https://www.stib-mivb.be/files/live/sites/STIBMIVB... is missing width/height — may cause layout shift
Set explicit width and height to prevent CLS.
Warning::
https://www.stib-mivb.be/files/live/sites/STIBMIVB... is missing width/height — may cause layout shift
Set explicit width and height to prevent CLS.
Warning::
https://www.stib-mivb.be/files/live/sites/STIBMIVB... is missing width/height — may cause layout shift
Set explicit width and height to prevent CLS.
Warning::
https://www.stib-mivb.be/files/live/sites/STIBMIVB... is missing width/height — may cause layout shift
Set explicit width and height to prevent CLS.
22 images 829 KB
0 oversized -0 KB
21 legacy format
10 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

C
JS Execution Cost
Action
1716ms total JS execution
REVIEW
1716ms total JS execution
Warning::
https://www.stib-mivb.be/modules/stibmivb-template...: 448ms CPU time
Warning::
https://www.stib-mivb.be/home: 277ms CPU time
Warning::
Unattributable: 265ms CPU time
Info::
https://tracking.stib-mivb.be/gtm.js?id=GTM-NR8C6F...: 147ms CPU time
Info::
https://www.stib-mivb.be/modules/stibmivb-template...: 146ms CPU time
Warning::
Third-party scripts: 1716ms (100% of total)

Main Thread Breakdown

Script Evaluation 46% Script Parsing & Compilation 19% Other 19% Style & Layout 11% Rendering 3%
ScriptTotalScriptingParse/CompileParty
https://www.stib-mivb.be/modules/stibmivb-template/javascript/main-rrfkY9Wl.js448ms277ms107ms3rd
https://www.stib-mivb.be/home277ms3ms1ms3rd
Unattributable265ms6ms0ms3rd
https://tracking.stib-mivb.be/gtm.js?id=GTM-NR8C6F27&gtm_auth=g3wZAhZGvfleAd4TmVXo8g&&gtm_preview=env-1&gtm_cookies_win=x147ms121ms23ms3rd
https://www.stib-mivb.be/modules/stibmivb-template/javascript/vendors.js146ms5ms139ms3rd
https://www.googletagmanager.com/gtag/js?id=AW-875372945&cx=c&gtm=4e6562&sign=2e420cca6fb36d0d41c922628e90ae131946b3f8600ac22d7bc6ecce1beb8b7c_2026051092ms77ms14ms3rd
https://connect.facebook.net/signals/config/537872945975515?v=2.9.313&r=stable&domain=www.stib-mivb.be&hme=97937018cefade17726f0472876fc101316b2ce9008a35a6a5a7977d7436151a&ex_m=104%2C205%2C154%2C22%2C72%2C73%2C145%2C68%2C67%2C11%2C162%2C90%2C16%2C138%2C48%2C146%2C77%2C112%2C47%2C127%2C39%2C75%2C78%2C134%2C159%2C164%2C8%2C4%2C5%2C7%2C6%2C3%2C91%2C101%2C165%2C170%2C219%2C62%2C186%2C187%2C55%2C276%2C30%2C74%2C231%2C230%2C229%2C23%2C33%2C103%2C61%2C10%2C63%2C97%2C98%2C99%2C105%2C130%2C31%2C29%2C132%2C133%2C129%2C128%2C155%2C76%2C158%2C156%2C157%2C50%2C60%2C123%2C15%2C161%2C45%2C263%2C264%2C262%2C26%2C27%2C28%2C18%2C20%2C44%2C40%2C42%2C41%2C83%2C92%2C96%2C110%2C144%2C147%2C46%2C111%2C24%2C21%2C119%2C69%2C36%2C149%2C148%2C150%2C141%2C139%2C25%2C35%2C59%2C109%2C160%2C70%2C17%2C152%2C114%2C81%2C66%2C19%2C85%2C86%2C116%2C84%2C136%2C135%2C34%2C278%2C293%2C212%2C201%2C202%2C200%2C296%2C288%2C52%2C213%2C107%2C131%2C80%2C121%2C54%2C49%2C113%2C120%2C126%2C58%2C64%2C151%2C115%2C37%2C32%2C53%2C56%2C100%2C163%2C1%2C124%2C14%2C122%2C12%2C2%2C57%2C93%2C65%2C118%2C89%2C88%2C166%2C167%2C94%2C95%2C9%2C125%2C102%2C51%2C142%2C87%2C79%2C71%2C117%2C106%2C43%2C143%2C0%2C82%2C137%2C140%2C153%2C38%2C108%2C13%2C16890ms76ms12ms3rd
https://consent.cookiebot.com/uc.js66ms57ms4ms3rd
https://www.googletagmanager.com/gtag/js?id=DC-4708247&cx=c&gtm=4e6562&sign=2e420cca6fb36d0d41c922628e90ae131946b3f8600ac22d7bc6ecce1beb8b7c_2026051064ms51ms12ms3rd
https://connect.facebook.net/en_US/fbevents.js63ms49ms14ms3rd

Showing top 10 of 11 scripts

B
HTTP/3 (QUIC)
HTTP/3 not advertised
REVIEW
HTTP/3 not advertised
Info::
HTTP/3 (QUIC) is not advertised
HTTP/3 isn't advertised via Alt-Svc and the worker didn't negotiate h3. HTTP/3 reduces handshake latency (1-RTT instead of 2-3 RTTs) and is more resilient on lossy connections. Most modern CDNs (Cloudflare, Fastly, AWS CloudFront, Google Cloud CDN) support HTTP/3 with a single config switch -- consider enabling for mobile-heavy workloads.
C
Compression Algorithm
Action
Main response served uncompressed
REVIEW
Main response served uncompressed
Info::
Main HTML response has no Content-Encoding (uncompressed)
The main HTML document is served without compression. The Text Compression section above lists the broader picture; for the main response specifically, even gzip would shave ~70-80% off most text payloads.
B
Server-Timing Observability
No Server-Timing header found
REVIEW
No Server-Timing header found
Info::
No Server-Timing header found
Server-Timing exposes backend timing breakdowns to browser DevTools (e.g., `db: 45ms; render: 120ms; cache: 2ms`). Useful for diagnosing slow pages without backend log access. Most modern frameworks (Next.js, Cloudflare Workers, Fastly) emit it automatically; absence on a managed platform usually means telemetry headers are stripped at the edge.
C
Green Hosting
Action
Whether the site is served from green-energy infrastructure
REVIEW

Green Hosting

No green hosting detected

B
HTTP Caching
no-cache
REVIEW
no-cache
Info::
Cache-Control header is set
Got: no-cache
Info::
No ETag or Last-Modified header
Conditional requests (304 Not Modified) are not possible without validators.
Cache-Control

no-cache

DirectiveValueMeaning
no-cache—Cache but always revalidate first
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
12 fonts (293 KB)
PASS
12 fonts (293 KB)
Info::
12 font(s) use font-display: swap (FOUT risk but functional)

Web fonts

12

293 KB total

Render-blocking

0

of 12

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 FCP 1.8 s LCP 2.0 shttps://fonts.gstatic.com/s/inter/v20/UcC73FwrK3iLTeHuS_nVMrMxCp50SjIa1ZL7W0Q5nw.woff2UcC73FwrK3iLTeHuS_nVMrM... https://fonts.gstatic.com/s/inter/v20/UcC73FwrK3iLTeHuS_nVMrMxCp50SjIa1ZL7W0Q5nw.woff2 — 47.3 KiB — 9 ms — font-display: swaphttps://www.stib-mivb.be/modules/stibmivb-template/css/fonts/brusseline-bold-webfont.woff2?ac1d118102814fb56874bdb5b207b345brusseline-bold-webfont... https://www.stib-mivb.be/modules/stibmivb-template/css/fonts/brusseline-bold-webfont.woff2?ac1d118102814fb56874bdb5b207b345 — 23.9 KiB — 129 ms — font-display: swaphttps://ka-p.fontawesome.com/releases/v6.7.2/webfonts/pro-fa-brands-400-0.woff2pro-fa-brands-400-0.woff2 https://ka-p.fontawesome.com/releases/v6.7.2/webfonts/pro-fa-brands-400-0.woff2 — 36.9 KiB — 27 ms — font-display: swaphttps://ka-p.fontawesome.com/releases/v6.7.2/webfonts/pro-fa-regular-400-2.woff2pro-fa-regular-400-2.woff2 https://ka-p.fontawesome.com/releases/v6.7.2/webfonts/pro-fa-regular-400-2.woff2 — 26.2 KiB — 23 ms — font-display: swaphttps://ka-p.fontawesome.com/releases/v6.7.2/webfonts/pro-fa-regular-400-0.woff2pro-fa-regular-400-0.woff2 https://ka-p.fontawesome.com/releases/v6.7.2/webfonts/pro-fa-regular-400-0.woff2 — 14.4 KiB — 25 ms — font-display: swaphttps://ka-p.fontawesome.com/releases/v6.7.2/webfonts/pro-fa-solid-900-0.woff2pro-fa-solid-900-0.woff2 https://ka-p.fontawesome.com/releases/v6.7.2/webfonts/pro-fa-solid-900-0.woff2 — 11.8 KiB — 28 ms — font-display: swaphttps://ka-p.fontawesome.com/releases/v6.7.2/webfonts/pro-fa-brands-400-1.woff2pro-fa-brands-400-1.woff2 https://ka-p.fontawesome.com/releases/v6.7.2/webfonts/pro-fa-brands-400-1.woff2 — 39.5 KiB — 20 ms — font-display: swaphttps://ka-p.fontawesome.com/releases/v6.7.2/webfonts/pro-fa-regular-400-12.woff2pro-fa-regular-400-12.w... https://ka-p.fontawesome.com/releases/v6.7.2/webfonts/pro-fa-regular-400-12.woff2 — 18.8 KiB — 26 ms — font-display: swaphttps://ka-p.fontawesome.com/releases/v6.7.2/webfonts/pro-fa-regular-400-14.woff2pro-fa-regular-400-14.w... https://ka-p.fontawesome.com/releases/v6.7.2/webfonts/pro-fa-regular-400-14.woff2 — 16.4 KiB — 17 ms — font-display: swaphttps://ka-p.fontawesome.com/releases/v6.7.2/webfonts/pro-fa-solid-900-4.woff2pro-fa-solid-900-4.woff2 https://ka-p.fontawesome.com/releases/v6.7.2/webfonts/pro-fa-solid-900-4.woff2 — 18.1 KiB — 14 ms — font-display: swaphttps://ka-p.fontawesome.com/releases/v6.7.2/webfonts/pro-fa-solid-900-14.woff2pro-fa-solid-900-14.woff2 https://ka-p.fontawesome.com/releases/v6.7.2/webfonts/pro-fa-solid-900-14.woff2 — 13.8 KiB — 16 ms — font-display: swaphttps://ka-p.fontawesome.com/releases/v6.7.2/webfonts/pro-fa-solid-900-11.woff2pro-fa-solid-900-11.woff2 https://ka-p.fontawesome.com/releases/v6.7.2/webfonts/pro-fa-solid-900-11.woff2 — 25.8 KiB — 19 ms — font-display: swap
UcC73FwrK3iLTeHuS_nVMrM... woff2 swap
Size 47 KB
Load time 9 ms
Start 1.2 s
Risk FOUT — text flashes from fallback to web font
brusseline-bold-webfont... woff2 swap
Size 24 KB
Load time 129 ms
Start 1.2 s
Risk FOUT — text flashes from fallback to web font
pro-fa-brands-400-0.woff2 woff2 swap
Size 37 KB
Load time 27 ms
Start 2.6 s
Risk FOUT — text flashes from fallback to web font
pro-fa-regular-400-2.woff2 woff2 swap
Size 26 KB
Load time 23 ms
Start 2.6 s
Risk FOUT — text flashes from fallback to web font
pro-fa-regular-400-0.woff2 woff2 swap
Size 14 KB
Load time 25 ms
Start 2.6 s
Risk FOUT — text flashes from fallback to web font
pro-fa-solid-900-0.woff2 woff2 swap
Size 12 KB
Load time 28 ms
Start 2.6 s
Risk FOUT — text flashes from fallback to web font
pro-fa-brands-400-1.woff2 woff2 swap
Size 40 KB
Load time 20 ms
Start 2.6 s
Risk FOUT — text flashes from fallback to web font
pro-fa-regular-400-12.w... woff2 swap
Size 19 KB
Load time 26 ms
Start 3.0 s
Risk FOUT — text flashes from fallback to web font
pro-fa-regular-400-14.w... woff2 swap
Size 16 KB
Load time 17 ms
Start 3.0 s
Risk FOUT — text flashes from fallback to web font
pro-fa-solid-900-4.woff2 woff2 swap
Size 18 KB
Load time 14 ms
Start 3.0 s
Risk FOUT — text flashes from fallback to web font
pro-fa-solid-900-14.woff2 woff2 swap
Size 14 KB
Load time 16 ms
Start 3.6 s
Risk FOUT — text flashes from fallback to web font
pro-fa-solid-900-11.woff2 woff2 swap
Size 26 KB
Load time 19 ms
Start 3.6 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
No optimization needed
PASS
No optimization needed
Info::
No resource hint issues
A+
LCP Image Preload
LCP preload audit not available
PASS
LCP preload audit not available
Info::
LCP image preload audit not available for this scan
A+
Main HTML Cache-Control
Main HTML uses no-cache -- safe revalidate-on-request policy
PASS
Main HTML uses no-cache -- safe revalidate-on-request policy
Info::
Main HTML uses no-cache -- safe revalidate-on-request policy
Got: no-cache
A+
Server Response Intelligence
1 server-response signal(s) detected
PASS
1 server-response signal(s) detected
Info::
No `ETag` or `Last-Modified` -- conditional GET not supported
Without either header, browsers can't issue conditional GETs and refresh always re-downloads the full response body even when nothing changed. Add `ETag: "<hash>"` (or `Last-Modified: <date>`) on cacheable responses; the server returns 304 Not Modified when the client's cached copy is still valid, saving bandwidth.
Network Waterfall
82 requests over 3660ms
INFO
0 ms 1.0 s 2.0 s 3.0 s FCP 1.8 s LCP 2.0 shttps://stib-mivb.brussels// https://stib-mivb.brussels/ — 301 — 197 B — 266 ms — http/1.1https://www.stib-mivb.be/www.stib-mivb.be/ https://www.stib-mivb.be/ — 302 — 1.1 KiB — 291 ms — http/1.1https://www.stib-mivb.be/homewww.stib-mivb.be/home https://www.stib-mivb.be/home — 200 — 9.5 KiB — 83 ms — http/1.1https://consent.cookiebot.com/uc.jsconsent.cookiebot.com/uc.js https://consent.cookiebot.com/uc.js — 200 — 35.7 KiB — 131 ms — h2https://www.stib-mivb.be/modules/stibmivb-template/javascript/tracking_NW_2025_16.jswww.stib-mivb.be/modules/stibmivb-t... https://www.stib-mivb.be/modules/stibmivb-template/javascript/tracking_NW_2025_16.js — 200 — 2.7 KiB — 86 ms — http/1.1https://www.stib-mivb.be/modules/stibmivb-template/css/main_NW_2026_07.csswww.stib-mivb.be/modules/stibmivb-t... https://www.stib-mivb.be/modules/stibmivb-template/css/main_NW_2026_07.css — 200 — 95.1 KiB — 493 ms — http/1.1https://www.stib-mivb.be/modules/stibmivb-template/css/cookiecss.csswww.stib-mivb.be/modules/stibmivb-t... https://www.stib-mivb.be/modules/stibmivb-template/css/cookiecss.css — 200 — 3.9 KiB — 249 ms — http/1.1https://www.stib-mivb.be/files/live/sites/STIBMIVB/files/Legal/Homepage/sitb-mivb-logo.svgwww.stib-mivb.be/files/live/sites/S... https://www.stib-mivb.be/files/live/sites/STIBMIVB/files/Legal/Homepage/sitb-mivb-logo.svg — 200 — 8.6 KiB — 269 ms — http/1.1https://www.stib-mivb.be/modules/stibmivb-template/images/svg/icon_search.svgwww.stib-mivb.be/modules/stibmivb-t... https://www.stib-mivb.be/modules/stibmivb-template/images/svg/icon_search.svg — 200 — 1.7 KiB — 268 ms — http/1.1https://consentcdn.cookiebot.com/consentconfig/019efa7a-a19b-434f-acfa-4bdd81c203f0/settings.jsonconsentcdn.cookiebot.com/consentcon... https://consentcdn.cookiebot.com/consentconfig/019efa7a-a19b-434f-acfa-4bdd81c203f0/settings.json — 200 — 952 B — 37 ms — h2https://www.stib-mivb.be/modules/stibmivb-login/images/svg/icon_account_offline.svgwww.stib-mivb.be/modules/stibmivb-l... https://www.stib-mivb.be/modules/stibmivb-login/images/svg/icon_account_offline.svg — 200 — 2.4 KiB — 117 ms — http/1.1https://www.stib-mivb.be/modules/stibmivb-eshop/images/svg/icon_basket.svgwww.stib-mivb.be/modules/stibmivb-e... https://www.stib-mivb.be/modules/stibmivb-eshop/images/svg/icon_basket.svg — 200 — 1.6 KiB — 209 ms — http/1.1https://kit.fontawesome.com/8c5fb68f3d.jskit.fontawesome.com/8c5fb68f3d.js https://kit.fontawesome.com/8c5fb68f3d.js — 200 — 5.7 KiB — 32 ms — h2https://cdn.jsdelivr.net/npm/bootstrap@5.0.2/dist/js/bootstrap.bundle.min.jscdn.jsdelivr.net/npm/bootstrap@5.0.... https://cdn.jsdelivr.net/npm/bootstrap@5.0.2/dist/js/bootstrap.bundle.min.js — 200 — 23.5 KiB — 27 ms — h2https://tracking.stib-mivb.be/gtm.js?id=GTM-NR8C6F27&gtm_auth=g3wZAhZGvfleAd4TmVXo8g&&gtm_preview=env-1&gtm_cookies_win=xtracking.stib-mivb.be/gtm.js?id=GTM... https://tracking.stib-mivb.be/gtm.js?id=GTM-NR8C6F27&gtm_auth=g3wZAhZGvfleAd4TmVXo8g&&gtm_preview=env-1&gtm_cookies_win=x — 200 — 533.6 KiB — 855 ms — http/1.1https://consentcdn.cookiebot.com/consentconfig/019efa7a-a19b-434f-acfa-4bdd81c203f0/stib-mivb.be/configuration.jsconsentcdn.cookiebot.com/consentcon... https://consentcdn.cookiebot.com/consentconfig/019efa7a-a19b-434f-acfa-4bdd81c203f0/stib-mivb.be/configuration.js — 200 — 669 B — 23 ms — h2https://consent.cookiebot.com/019efa7a-a19b-434f-acfa-4bdd81c203f0/cc.js?renew=false&referer=www.stib-mivb.be&dnt=false&init=false&culture=enconsent.cookiebot.com/019efa7a-a19b... https://consent.cookiebot.com/019efa7a-a19b-434f-acfa-4bdd81c203f0/cc.js?renew=false&referer=www.stib-mivb.be&dnt=false&init=false&culture=en — 200 — 284 B — 433 ms — h2https://www.stib-mivb.be/modules/stibmivb-core/images/gif/realtime.gifwww.stib-mivb.be/modules/stibmivb-c... https://www.stib-mivb.be/modules/stibmivb-core/images/gif/realtime.gif — 200 — 6.6 KiB — 129 ms — http/1.1https://www.stib-mivb.be/files/live/sites/STIBMIVB/files/Travel/works.svgwww.stib-mivb.be/files/live/sites/S... https://www.stib-mivb.be/files/live/sites/STIBMIVB/files/Travel/works.svg — 200 — 4.6 KiB — 157 ms — http/1.1https://consentcdn.cookiebot.com/sdk/bc-v4.min.htmlconsentcdn.cookiebot.com/sdk/bc-v4.... https://consentcdn.cookiebot.com/sdk/bc-v4.min.html — 200 — 811 B — 22 ms — h2https://www.stib-mivb.be/modules/stibmivb-template/javascript/vendors.jswww.stib-mivb.be/modules/stibmivb-t... https://www.stib-mivb.be/modules/stibmivb-template/javascript/vendors.js — 200 — 972.1 KiB — 785 ms — http/1.1https://www.stib-mivb.be/modules/stibmivb-template/javascript/main-rrfkY9Wl.jswww.stib-mivb.be/modules/stibmivb-t... https://www.stib-mivb.be/modules/stibmivb-template/javascript/main-rrfkY9Wl.js — 200 — 1.1 MiB — 837 ms — http/1.1https://www.stib-mivb.be/modules/stibmivb-template/images/favicon/site.webmanifestwww.stib-mivb.be/modules/stibmivb-t... https://www.stib-mivb.be/modules/stibmivb-template/images/favicon/site.webmanifest — 200 — 1.3 KiB — 83 ms — http/1.1https://www.stib-mivb.be/files/live/sites/STIBMIVB/files/Personnages/Tenez-vous.svgwww.stib-mivb.be/files/live/sites/S... https://www.stib-mivb.be/files/live/sites/STIBMIVB/files/Personnages/Tenez-vous.svg — 200 — 33.3 KiB — 173 ms — http/1.1https://www.stib-mivb.be/files/live/sites/STIBMIVB/files/Personnages/Personne%20avec%20poteau%20d%e2%80%99arr%c3%aat-01.svgwww.stib-mivb.be/files/live/sites/S... https://www.stib-mivb.be/files/live/sites/STIBMIVB/files/Personnages/Personne%20avec%20poteau%20d%e2%80%99arr%c3%aat-01.svg — 200 — 14.4 KiB — 89 ms — http/1.1https://www.stib-mivb.be/files/live/sites/STIBMIVB/files/Buy/EMV.pngwww.stib-mivb.be/files/live/sites/S... https://www.stib-mivb.be/files/live/sites/STIBMIVB/files/Buy/EMV.png — 200 — 68.2 KiB — 324 ms — http/1.1https://www.stib-mivb.be/files/live/sites/STIBMIVB/files/Travel/Floya_App-Icon_Apple.svgwww.stib-mivb.be/files/live/sites/S... https://www.stib-mivb.be/files/live/sites/STIBMIVB/files/Travel/Floya_App-Icon_Apple.svg — 200 — 5.1 KiB — 88 ms — http/1.1https://www.stib-mivb.be/files/live/sites/STIBMIVB/files/Personnages/Group%20809.svgwww.stib-mivb.be/files/live/sites/S... https://www.stib-mivb.be/files/live/sites/STIBMIVB/files/Personnages/Group%20809.svg — 200 — 9.8 KiB — 83 ms — http/1.1https://fonts.googleapis.com/css2?family=Inter:wght@400;500;600;700&display=swapfonts.googleapis.com/css2?family=In... https://fonts.googleapis.com/css2?family=Inter:wght@400;500;600;700&display=swap — 200 — 1.2 KiB — 38 ms — h2https://www.stib-mivb.be/files/live/sites/STIBMIVB/files/template/label_anysurfer_40x40.pngwww.stib-mivb.be/files/live/sites/S... https://www.stib-mivb.be/files/live/sites/STIBMIVB/files/template/label_anysurfer_40x40.png — 200 — 2.4 KiB — 88 ms — http/1.1
0 ms 1.0 s 2.0 s 3.0 s FCP 1.8 s LCP 2.0 shttps://stib-mivb.brussels// https://stib-mivb.brussels/ — 301 — 197 B — 266 ms — http/1.1https://www.stib-mivb.be/www.stib-mivb.be/ https://www.stib-mivb.be/ — 302 — 1.1 KiB — 291 ms — http/1.1https://www.stib-mivb.be/homewww.stib-mivb.be/home https://www.stib-mivb.be/home — 200 — 9.5 KiB — 83 ms — http/1.1https://consent.cookiebot.com/uc.jsconsent.cookiebot.com/uc.js https://consent.cookiebot.com/uc.js — 200 — 35.7 KiB — 131 ms — h2https://www.stib-mivb.be/modules/stibmivb-template/javascript/tracking_NW_2025_16.jswww.stib-mivb.be/modules/stibmivb-t... https://www.stib-mivb.be/modules/stibmivb-template/javascript/tracking_NW_2025_16.js — 200 — 2.7 KiB — 86 ms — http/1.1https://www.stib-mivb.be/modules/stibmivb-template/css/main_NW_2026_07.csswww.stib-mivb.be/modules/stibmivb-t... https://www.stib-mivb.be/modules/stibmivb-template/css/main_NW_2026_07.css — 200 — 95.1 KiB — 493 ms — http/1.1https://www.stib-mivb.be/modules/stibmivb-template/css/cookiecss.csswww.stib-mivb.be/modules/stibmivb-t... https://www.stib-mivb.be/modules/stibmivb-template/css/cookiecss.css — 200 — 3.9 KiB — 249 ms — http/1.1https://www.stib-mivb.be/files/live/sites/STIBMIVB/files/Legal/Homepage/sitb-mivb-logo.svgwww.stib-mivb.be/files/live/sites/S... https://www.stib-mivb.be/files/live/sites/STIBMIVB/files/Legal/Homepage/sitb-mivb-logo.svg — 200 — 8.6 KiB — 269 ms — http/1.1https://www.stib-mivb.be/modules/stibmivb-template/images/svg/icon_search.svgwww.stib-mivb.be/modules/stibmivb-t... https://www.stib-mivb.be/modules/stibmivb-template/images/svg/icon_search.svg — 200 — 1.7 KiB — 268 ms — http/1.1https://consentcdn.cookiebot.com/consentconfig/019efa7a-a19b-434f-acfa-4bdd81c203f0/settings.jsonconsentcdn.cookiebot.com/consentcon... https://consentcdn.cookiebot.com/consentconfig/019efa7a-a19b-434f-acfa-4bdd81c203f0/settings.json — 200 — 952 B — 37 ms — h2https://www.stib-mivb.be/modules/stibmivb-login/images/svg/icon_account_offline.svgwww.stib-mivb.be/modules/stibmivb-l... https://www.stib-mivb.be/modules/stibmivb-login/images/svg/icon_account_offline.svg — 200 — 2.4 KiB — 117 ms — http/1.1https://www.stib-mivb.be/modules/stibmivb-eshop/images/svg/icon_basket.svgwww.stib-mivb.be/modules/stibmivb-e... https://www.stib-mivb.be/modules/stibmivb-eshop/images/svg/icon_basket.svg — 200 — 1.6 KiB — 209 ms — http/1.1https://kit.fontawesome.com/8c5fb68f3d.jskit.fontawesome.com/8c5fb68f3d.js https://kit.fontawesome.com/8c5fb68f3d.js — 200 — 5.7 KiB — 32 ms — h2https://cdn.jsdelivr.net/npm/bootstrap@5.0.2/dist/js/bootstrap.bundle.min.jscdn.jsdelivr.net/npm/bootstrap@5.0.... https://cdn.jsdelivr.net/npm/bootstrap@5.0.2/dist/js/bootstrap.bundle.min.js — 200 — 23.5 KiB — 27 ms — h2https://tracking.stib-mivb.be/gtm.js?id=GTM-NR8C6F27&gtm_auth=g3wZAhZGvfleAd4TmVXo8g&&gtm_preview=env-1&gtm_cookies_win=xtracking.stib-mivb.be/gtm.js?id=GTM... https://tracking.stib-mivb.be/gtm.js?id=GTM-NR8C6F27&gtm_auth=g3wZAhZGvfleAd4TmVXo8g&&gtm_preview=env-1&gtm_cookies_win=x — 200 — 533.6 KiB — 855 ms — http/1.1https://consentcdn.cookiebot.com/consentconfig/019efa7a-a19b-434f-acfa-4bdd81c203f0/stib-mivb.be/configuration.jsconsentcdn.cookiebot.com/consentcon... https://consentcdn.cookiebot.com/consentconfig/019efa7a-a19b-434f-acfa-4bdd81c203f0/stib-mivb.be/configuration.js — 200 — 669 B — 23 ms — h2https://consent.cookiebot.com/019efa7a-a19b-434f-acfa-4bdd81c203f0/cc.js?renew=false&referer=www.stib-mivb.be&dnt=false&init=false&culture=enconsent.cookiebot.com/019efa7a-a19b... https://consent.cookiebot.com/019efa7a-a19b-434f-acfa-4bdd81c203f0/cc.js?renew=false&referer=www.stib-mivb.be&dnt=false&init=false&culture=en — 200 — 284 B — 433 ms — h2https://www.stib-mivb.be/modules/stibmivb-core/images/gif/realtime.gifwww.stib-mivb.be/modules/stibmivb-c... https://www.stib-mivb.be/modules/stibmivb-core/images/gif/realtime.gif — 200 — 6.6 KiB — 129 ms — http/1.1https://www.stib-mivb.be/files/live/sites/STIBMIVB/files/Travel/works.svgwww.stib-mivb.be/files/live/sites/S... https://www.stib-mivb.be/files/live/sites/STIBMIVB/files/Travel/works.svg — 200 — 4.6 KiB — 157 ms — http/1.1https://consentcdn.cookiebot.com/sdk/bc-v4.min.htmlconsentcdn.cookiebot.com/sdk/bc-v4.... https://consentcdn.cookiebot.com/sdk/bc-v4.min.html — 200 — 811 B — 22 ms — h2https://www.stib-mivb.be/modules/stibmivb-template/javascript/vendors.jswww.stib-mivb.be/modules/stibmivb-t... https://www.stib-mivb.be/modules/stibmivb-template/javascript/vendors.js — 200 — 972.1 KiB — 785 ms — http/1.1https://www.stib-mivb.be/modules/stibmivb-template/javascript/main-rrfkY9Wl.jswww.stib-mivb.be/modules/stibmivb-t... https://www.stib-mivb.be/modules/stibmivb-template/javascript/main-rrfkY9Wl.js — 200 — 1.1 MiB — 837 ms — http/1.1https://www.stib-mivb.be/modules/stibmivb-template/images/favicon/site.webmanifestwww.stib-mivb.be/modules/stibmivb-t... https://www.stib-mivb.be/modules/stibmivb-template/images/favicon/site.webmanifest — 200 — 1.3 KiB — 83 ms — http/1.1https://www.stib-mivb.be/files/live/sites/STIBMIVB/files/Personnages/Tenez-vous.svgwww.stib-mivb.be/files/live/sites/S... https://www.stib-mivb.be/files/live/sites/STIBMIVB/files/Personnages/Tenez-vous.svg — 200 — 33.3 KiB — 173 ms — http/1.1https://www.stib-mivb.be/files/live/sites/STIBMIVB/files/Personnages/Personne%20avec%20poteau%20d%e2%80%99arr%c3%aat-01.svgwww.stib-mivb.be/files/live/sites/S... https://www.stib-mivb.be/files/live/sites/STIBMIVB/files/Personnages/Personne%20avec%20poteau%20d%e2%80%99arr%c3%aat-01.svg — 200 — 14.4 KiB — 89 ms — http/1.1https://www.stib-mivb.be/files/live/sites/STIBMIVB/files/Buy/EMV.pngwww.stib-mivb.be/files/live/sites/S... https://www.stib-mivb.be/files/live/sites/STIBMIVB/files/Buy/EMV.png — 200 — 68.2 KiB — 324 ms — http/1.1https://www.stib-mivb.be/files/live/sites/STIBMIVB/files/Travel/Floya_App-Icon_Apple.svgwww.stib-mivb.be/files/live/sites/S... https://www.stib-mivb.be/files/live/sites/STIBMIVB/files/Travel/Floya_App-Icon_Apple.svg — 200 — 5.1 KiB — 88 ms — http/1.1https://www.stib-mivb.be/files/live/sites/STIBMIVB/files/Personnages/Group%20809.svgwww.stib-mivb.be/files/live/sites/S... https://www.stib-mivb.be/files/live/sites/STIBMIVB/files/Personnages/Group%20809.svg — 200 — 9.8 KiB — 83 ms — http/1.1https://fonts.googleapis.com/css2?family=Inter:wght@400;500;600;700&display=swapfonts.googleapis.com/css2?family=In... https://fonts.googleapis.com/css2?family=Inter:wght@400;500;600;700&display=swap — 200 — 1.2 KiB — 38 ms — h2https://www.stib-mivb.be/files/live/sites/STIBMIVB/files/template/label_anysurfer_40x40.pngwww.stib-mivb.be/files/live/sites/S... https://www.stib-mivb.be/files/live/sites/STIBMIVB/files/template/label_anysurfer_40x40.png — 200 — 2.4 KiB — 88 ms — http/1.1https://www.stib-mivb.be/files/live/sites/STIBMIVB/files/template/store.svgwww.stib-mivb.be/files/live/sites/S... https://www.stib-mivb.be/files/live/sites/STIBMIVB/files/template/store.svg — 200 — 128.8 KiB — 341 ms — http/1.1https://www.stib-mivb.be/files/live/sites/STIBMIVB/files/__LGBTQ%20-%201440X320.svgwww.stib-mivb.be/files/live/sites/S... https://www.stib-mivb.be/files/live/sites/STIBMIVB/files/__LGBTQ%20-%201440X320.svg — 200 — 122.3 KiB — 90 ms — http/1.1https://www.stib-mivb.be/modules/stibmivb-template/images/svg/home_wave_top.svgwww.stib-mivb.be/modules/stibmivb-t... https://www.stib-mivb.be/modules/stibmivb-template/images/svg/home_wave_top.svg — 200 — 1.1 KiB — 172 ms — http/1.1https://fonts.gstatic.com/s/inter/v20/UcC73FwrK3iLTeHuS_nVMrMxCp50SjIa1ZL7W0Q5nw.woff2fonts.gstatic.com/s/inter/v20/UcC73... https://fonts.gstatic.com/s/inter/v20/UcC73FwrK3iLTeHuS_nVMrMxCp50SjIa1ZL7W0Q5nw.woff2 — 200 — 47.3 KiB — 9 ms — 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— 200 — 125.1 KiB — 12 ms — h3https://kit.fontawesome.com/8c5fb68f3d.jskit.fontawesome.com/8c5fb68f3d.js https://kit.fontawesome.com/8c5fb68f3d.js — 200 — 0 B — 2 ms — h2https://www.google.com/ccm/collect?rcb=11&frm=0&en=page_view&dl=https%3A%2F%2Fwww.stib-mivb.be%2Fhome&scrsrc=www.googletagmanager.com&rnd=2145529488.1778416028&dt=Home%20-%20STIB%20-%20MIVB&auid=1506505692.1778416028&navt=n&npa=0&us_privacy=1---&gtm=45fe6562v9181661298z89168095369za20gzb9168095369zd9168095369xec&gcs=G111&gcd=13v3v3v2v5l1&dma=0&tag_exp=0~115938466~115938468~118463261~118494633&apve=1&apvf=f&apvc=0&tids=DC-4708247&tid=DC-4708247&tft=1778416028810&tfd=2190www.google.com/ccm/collect?rcb=11&f... 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B — 25 ms — h3https://www.stib-mivb.be/modules/stibmivb-template/javascript/main-rrfkY9Wl.jswww.stib-mivb.be/modules/stibmivb-t... https://www.stib-mivb.be/modules/stibmivb-template/javascript/main-rrfkY9Wl.js — 200 — 0 B — 49 ms — http/1.1https://ka-p.fontawesome.com/releases/v6.7.2/webfonts/pro-fa-brands-400-0.woff2ka-p.fontawesome.com/releases/v6.7.... https://ka-p.fontawesome.com/releases/v6.7.2/webfonts/pro-fa-brands-400-0.woff2 — 200 — 36.9 KiB — 27 ms — h2https://ka-p.fontawesome.com/releases/v6.7.2/webfonts/pro-fa-regular-400-2.woff2ka-p.fontawesome.com/releases/v6.7.... https://ka-p.fontawesome.com/releases/v6.7.2/webfonts/pro-fa-regular-400-2.woff2 — 200 — 26.2 KiB — 23 ms — h2https://ka-p.fontawesome.com/releases/v6.7.2/webfonts/pro-fa-regular-400-0.woff2ka-p.fontawesome.com/releases/v6.7.... https://ka-p.fontawesome.com/releases/v6.7.2/webfonts/pro-fa-regular-400-0.woff2 — 200 — 14.4 KiB — 25 ms — 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https://ka-p.fontawesome.com/releases/v6.7.2/webfonts/pro-fa-regular-400-12.woff2 — 200 — 18.8 KiB — 26 ms — h2https://ka-p.fontawesome.com/releases/v6.7.2/webfonts/pro-fa-regular-400-14.woff2ka-p.fontawesome.com/releases/v6.7.... https://ka-p.fontawesome.com/releases/v6.7.2/webfonts/pro-fa-regular-400-14.woff2 — 200 — 16.4 KiB — 17 ms — h2https://ka-p.fontawesome.com/releases/v6.7.2/webfonts/pro-fa-solid-900-4.woff2ka-p.fontawesome.com/releases/v6.7.... https://ka-p.fontawesome.com/releases/v6.7.2/webfonts/pro-fa-solid-900-4.woff2 — 200 — 18.1 KiB — 14 ms — h2https://api.stib-mivb.be/b2c/api/authentication/device/api.stib-mivb.be/b2c/api/authentica... https://api.stib-mivb.be/b2c/api/authentication/device/ — 200 — 1.3 KiB — 118 ms — http/1.1https://api.stib-mivb.be/b2c/api/lines?language=en&app_language=enapi.stib-mivb.be/b2c/api/lines?lang... https://api.stib-mivb.be/b2c/api/lines?language=en&app_language=en — 200 — 0 B — 89 ms — 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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 1716ms · 1458KB · €9/mo
www.stib-mivb.be
Other
Costly
Execution 448ms
Transfer 0 KB
Unused 49%
Monthly Cost €2/mo
www.stib-mivb.be
Other
Costly
Execution 277ms
Transfer 9 KB
Monthly Cost €1/mo
Unattributable
Other
Costly
Execution 265ms
Transfer 0 KB
Monthly Cost €1/mo
tracking.stib-mivb.be
Other
Optional
Execution 147ms
Transfer 534 KB
Unused 36%
Monthly Cost €1/mo
www.stib-mivb.be
Other
Optional
Execution 146ms
Transfer 0 KB
Unused 70%
Monthly Cost €1/mo
Google Tag Manager
Tag Manager
Optional
Execution 92ms
Transfer 145 KB
Unused 36%
Monthly Cost €0/mo
Facebook Pixel
Advertising
Optional
Execution 90ms
Transfer 125 KB
Unused 28%
Monthly Cost €0/mo
consent.cookiebot.com
Other
Optional
Execution 66ms
Transfer 36 KB
Monthly Cost €0/mo
Google Tag Manager
Tag Manager
Optional
Execution 64ms
Transfer 130 KB
Unused 46%
Monthly Cost €0/mo
Facebook Pixel
Advertising
Optional
Execution 63ms
Transfer 97 KB
Unused 36%
Monthly Cost €0/mo
tracking.stib-mivb.be
Other
Optional
Execution 58ms
Transfer 381 KB
Unused 51%
Monthly Cost €0/mo

These scripts may cost more than they're worth

  • www.stib-mivb.be adds 448ms and costs ~€2/month
  • www.stib-mivb.be adds 277ms and costs ~€1/month
  • Unattributable adds 265ms and costs ~€1/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.stib-mivb.be takes 448ms 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.stib-mivb.be takes 277ms 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 265ms 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

70% of www.stib-mivb.be'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 tracking.stib-mivb.be'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

Image Optimization
14 images, 149 KB total, 72 KB wasted
INFO

Image Optimization Audit

Total Images

14

Total Size

149 KB

Oversized

2

Wasted

72 KB

12 missing alt text 14 missing dimensions 12 missing lazy loading
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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