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Performance

· 17 checks — Lighthouse + waterfall + sustainability rolled into one auditable list.
SCORE
93
GRADE
A
FIX
1
REVIEW
2
PASS
12
INFO
2

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

Mobile Desktop
67
Performance Overall performance score (0–100) based on Core Web Vitals and other metrics. 90+ is good.
71
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.
73
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.

4.26 s

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

6.35 s

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

18 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.

4.36 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.

6.36 s

Page Load Progression

375 ms
750 ms
1.1 s
1.5 s
1.9 s
2.2 s
2.6 s
3.0 s
Checks
17
12 PASS 2 REVIEW 1 FIX
D
HTTP Caching
Action
no-store (uncacheable)
FIX
no-store (uncacheable)
Info::
Cache-Control: no-store prevents all caching
Intentional for dynamic content, but increases server load for every page view.
Got: no-cache, no-store
Info::
No ETag or Last-Modified header
Conditional requests (304 Not Modified) are not possible without validators.
Cache-Control

no-cache, no-store

DirectiveValueMeaning
no-cache—Cache but always revalidate first
no-store—Never cache this response
B
Image Optimization
7 images, 0 KB saveable
REVIEW
7 images, 0 KB saveable
Info::
All images are well-optimized
7 images 325 KB
0 oversized -0 KB
7 legacy format
0 missing dimensions CLS risk
C
JS Bundles
Action
3 scripts, 260 KB unused
REVIEW
3 scripts, 260 KB unused
Warning::
https://ctan.org/assets/portal-944f93dcc061b0c8fb3...: 260 KB unused (78%)
Consider code splitting or tree shaking to reduce unused code.
Info::
Total unused JavaScript: 260 KB
260 KB unused JavaScript

Downloaded but never executed on this page.

ScriptSizeUnusedMinifiedParty
https://ctan.org/assets/portal-944f93dcc061b0c8fb36b9debe744e42.js335 KB260 KB (78%)✓1st
https://ctan.org/assets/lightbox/lightbox.min-7ad53dc7cf622f05176030c7b4352126.js8 KB—✓1st
https://ctan.org/assets/heartbeat-23c92f45463bf81850fbb3e1f20e94b6.js6 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
Page Weight Budget
874 KB transferred, 18 requests
PASS
874 KB transferred, 18 requests
Info::
Page weighs 943 KB (874 KB transferred)
Info::
18 HTTP requests
Info::
Estimated 0.18 g CO2 per page load
874 KB / 2.4 MB budget
874 KB transferred
18 requests
0.18 g CO2 per page load
JavaScript 348.2 KiB 40%
Images 325.0 KiB 37%
Fonts 162.3 KiB 19%
CSS 15.4 KiB 2%
Other 15.2 KiB 2%
HTML 6.2 KiB 1%
Other 968 B 0%
Other 710 B 0%
0 2.4 MB 4.9 MB
Under budget
A+
Third-Party Impact
No third-party resources
PASS
No third-party resources
Info::
No third-party resources detected
No third-party resources detected — all resources are first-party.
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+
JS Execution Cost
438ms total JS execution
PASS
438ms total JS execution
Warning::
https://ctan.org/assets/portal-944f93dcc061b0c8fb3...: 258ms CPU time
Info::
Unattributable: 126ms CPU time
Info::
https://ctan.org/: 55ms CPU time
Info::
Third-party scripts: 126ms (29% of total)

Main Thread Breakdown

Other 36% Script Evaluation 28% Style & Layout 22% Script Parsing & Compilation 8% Parse HTML & CSS 5%
ScriptTotalScriptingParse/CompileParty
https://ctan.org/assets/portal-944f93dcc061b0c8fb36b9debe744e42.js258ms112ms33ms1st
Unattributable126ms5ms0ms3rd
https://ctan.org/55ms4ms1ms1st
A+
Font Loading
1 fonts (162 KB)
PASS
1 fonts (162 KB)
Info::
1 font(s) use font-display: swap (FOUT risk but functional)

Web fonts

1

162 KB total

Render-blocking

0

of 1

Dominant font-display

swap

Most common across fonts

Font loading timeline
Transfer FOIT (block) FOUT (swap)
0 ms 1.0 s 2.0 s 3.0 s 4.0 s 5.0 s 6.0 s FCP 4.3 s LCP 6.3 shttps://ctan.org/assets/font-awesome-4.7.0/fonts/fontawesome-webfont.ttf?v=4.7.0fontawesome-webfont.ttf https://ctan.org/assets/font-awesome-4.7.0/fonts/fontawesome-webfont.ttf?v=4.7.0 — 162.3 KiB — 72 ms — font-display: swap
fontawesome-webfont.ttf unknown swap
Size 162 KB
Load time 72 ms
Start 368 ms
Risk FOUT — text flashes from fallback to web font
  • 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 ~130 KB and ~260 ms

A+
Resource Caching
All resources properly cached
PASS
All resources properly cached
Info::
No caching issues found
All static resources have appropriate caching headers.
A+
Critical Rendering Path
No render-blocking resources
PASS
No render-blocking resources
Info::
No render-blocking resources detected
A+
Resource Hints
No optimization needed
PASS
No optimization needed
Info::
No resource hint issues
A+
Page Weight Inventory
18 resources · 874 KB · 260 KB savings available
PASS
18 resources · 874 KB · 260 KB savings available
Info::
Within 1MB page-weight target
Got: 874 KB
Info::
~260 KB of savings available
Info::
1 resources over 200KB
18 resources · 874.0 KiB · 0 third-party Within 1MB page-weight target
JavaScript 40% · 348.2 KiB
Image 39% · 340.2 KiB
Font 19% · 162.3 KiB
CSS 2% · 15.4 KiB
Document 1% · 6.2 KiB
Other 0% · 1.6 KiB

~259.9 KiB of savings available

Remove unused JavaScript: 259.9 KiB
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+
Green Hosting
Whether the site is served from green-energy infrastructure
PASS

Green Hosting

This site is hosted on green energy infrastructure

Provider: netcup GmbH

Network Waterfall
18 requests over 482ms
INFO
0 ms 1.0 s 2.0 s 3.0 s 4.0 s 5.0 s 6.0 s FCP 4.3 s LCP 6.3 shttps://ctan.org// https://ctan.org/ — 200 — 6.2 KiB — 118 ms — http/1.1https://ctan.org/assets/portal-944f93dcc061b0c8fb36b9debe744e42.js/assets/portal-944f93dcc061b0c8fb36... https://ctan.org/assets/portal-944f93dcc061b0c8fb36b9debe744e42.js — 200 — 334.5 KiB — 169 ms — http/1.1https://ctan.org/assets/lightbox/lightbox.min-7ad53dc7cf622f05176030c7b4352126.js/assets/lightbox/lightbox.min-7ad53... https://ctan.org/assets/lightbox/lightbox.min-7ad53dc7cf622f05176030c7b4352126.js — 200 — 8.1 KiB — 39 ms — http/1.1https://ctan.org/assets/lightbox/lightbox-a19df1db63f966d9f830ee78a639f137.css/assets/lightbox/lightbox-a19df1db6... https://ctan.org/assets/lightbox/lightbox-a19df1db63f966d9f830ee78a639f137.css — 200 — 1.4 KiB — 74 ms — http/1.1https://ctan.org/assets/heartbeat-23c92f45463bf81850fbb3e1f20e94b6.js/assets/heartbeat-23c92f45463bf8185... https://ctan.org/assets/heartbeat-23c92f45463bf81850fbb3e1f20e94b6.js — 200 — 5.7 KiB — 103 ms — http/1.1https://ctan.org/assets/skin/gray/skin.css/assets/skin/gray/skin.css https://ctan.org/assets/skin/gray/skin.css — 200 — 12.6 KiB — 137 ms — http/1.1https://ctan.org/teaser/topic/graphics-3d/teaser/topic/graphics-3d https://ctan.org/teaser/topic/graphics-3d — 200 — 102.8 KiB — 200 ms — http/1.1https://ctan.org/assets/teaser/M/tex-1-bca293031efb62e5747c5b74f65fff6f.png/assets/teaser/M/tex-1-bca293031efb... https://ctan.org/assets/teaser/M/tex-1-bca293031efb62e5747c5b74f65fff6f.png — 200 — 97.0 KiB — 164 ms — http/1.1https://ctan.org/assets/favicon/manifest-79a60c90526dbf14f7824aa7aa50579f.json/assets/favicon/manifest-79a60c9052... https://ctan.org/assets/favicon/manifest-79a60c90526dbf14f7824aa7aa50579f.json — 200 — 710 B — 103 ms — http/1.1https://ctan.org/assets/skin/print/skin.css/assets/skin/print/skin.css https://ctan.org/assets/skin/print/skin.css — 200 — 1.3 KiB — 36 ms — http/1.1https://ctan.org/assets/skin/gray/images/head-50-4ee429caa515136c419d9d5000fc611a.png/assets/skin/gray/images/head-50-4e... https://ctan.org/assets/skin/gray/images/head-50-4ee429caa515136c419d9d5000fc611a.png — 200 — 112.3 KiB — 69 ms — http/1.1https://ctan.org/assets/lightbox/prev.png/assets/lightbox/prev.png https://ctan.org/assets/lightbox/prev.png — 200 — 1.8 KiB — 38 ms — http/1.1https://ctan.org/assets/lightbox/next.png/assets/lightbox/next.png https://ctan.org/assets/lightbox/next.png — 200 — 1.7 KiB — 38 ms — http/1.1https://ctan.org/assets/lightbox/loading.gif/assets/lightbox/loading.gif https://ctan.org/assets/lightbox/loading.gif — 200 — 8.7 KiB — 39 ms — http/1.1https://ctan.org/upload/summary/upload/summary https://ctan.org/upload/summary — 200 — 968 B — 62 ms — http/1.1https://ctan.org/assets/font-awesome-4.7.0/fonts/fontawesome-webfont.ttf?v=4.7.0/assets/font-awesome-4.7.0/fonts/fo... https://ctan.org/assets/font-awesome-4.7.0/fonts/fontawesome-webfont.ttf?v=4.7.0 — 200 — 162.3 KiB — 72 ms — http/1.1https://ctan.org/assets/lightbox/close.png/assets/lightbox/close.png https://ctan.org/assets/lightbox/close.png — 200 — 713 B — 36 ms — http/1.1https://ctan.org/assets/favicon/favicon-afd4a866cd0c27587b7b06cd4199a57f.ico/assets/favicon/favicon-afd4a866cd0... https://ctan.org/assets/favicon/favicon-afd4a866cd0c27587b7b06cd4199a57f.ico — 200 — 15.2 KiB — 36 ms — http/1.1
HTML JavaScript CSS Images Fonts XHR/Fetch Other
Third-Party Script Cost
Per-script blocking time, transfer cost, and cache headers
INFO
29% of JavaScript execution is third-party
First-party Third-party 126ms · 0KB · €1/mo
Unattributable
Other
Optional
Execution 126ms
Transfer 0 KB
Monthly Cost €1/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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