Cardano's Biggest Upgrade Yet, Leios: 100x Throughput Without Weaker Security

Sun, 28 Jun 2026 10:00:00 +0000

The harshest thing said about Cardano, in my years of following it, is “1 TPS” — painfully slow. Its long-awaited answer is called Leios, which claims to push throughput up by tens to hundreds of times without lowering security by an inch. Its public testnet went live in June 2026, with mainnet targeted for the end of the year.

Let me explain Leios in plain language: what it actually changes, and why “faster without getting flimsier” holds up.

Why Is Cardano So Slow? Because Its Security Is Proved in Papers

Tue, 20 Jan 2026 10:00:00 +0000

My first impression of Cardano was a single word: slow. Other chains keep shouting about scaling and ecosystems; Cardano, after ten years, is still saying “our consensus paper got through another round of peer review.” I gave it the same nickname everyone does — the academic chain — and the same verdict: so slow, no good.

After actually digging into it, I’ve come to think that “slow” is the most valuable thing about it. Let me start from the bottom: how Cardano keeps its ledger, why it dares to write “security” into academic papers, and where it differs from Ethereum.

Ouroboros on Time Friend

Cardano's Biggest Upgrade Yet, Leios: 100x Throughput Without Weaker Security

Why Is Cardano So Slow? Because Its Security Is Proved in Papers