Check of ciunkos.com/ksef-invoice-validator

Oct 23, 2026, 02:41 · daily

Lighthouse 13.5 (mobile, simulated throttling), median of three runs. Scores 0–100: 90 and up green, 50–89 orange, below 50 red; a dash means the category was not measured in that check.

TBT is the lab stand-in for INP, which needs real interactions.

Performance
100good±0 vs previous
LCP
923 msgood+13 ms vs previous
CLS
0good±0 vs previous
TBT
0 msgood±0 vs previous
FCP
923 msgood+13 ms vs previous
TTFB
32 msgood+21 ms vs previous

No slowdown against the previous check and the 7-day median.

First screen: https://ciunkos.com/ksef-invoice-validator
First screen
LCP element
main > section.hero > div.wrap > p.lead Your own system, OMS or SaaS now has to send invoices to KSeF. Drop an FA(3) XM…
Page weight
26 KB
Long tasks
1
Conditions
Lighthouse 13.5.0, mobile (Moto G Power emulation, 412×823), simulated throttling (150 ms RTT, 1.6 Mbps, CPU 4×), median of 3 runs, benchmarkIndex 2878

Loads

LoadPerfLCPFCPTBTCLSTTFB
1100941 ms941 ms0 ms079 ms
2100923 ms923 ms0 ms032 ms
3100910 ms910 ms0 ms010 ms

What failed

Performance 100

Accessibility 100

Nothing failed in this category.

Best Practices 100

Nothing failed in this category.

SEO 100

Nothing failed in this category.