On the official site of Koa (@Koaxmeta), this note covers Ethereum Glamsterdam.
"The rehearsal kept finalizing blocks under new builder rules after going live earlier this week."
That line from the CoinDesk report on September 17 captures the steady progress on Ethereum's Glamsterdam upgrade. The testnet exercise ran without drama, letting nodes adapt to updated block-building steps while everything stayed online.
Trust in the Process
Developers framed the run as a controlled rehearsal, not a stress test with attacks. Nethermind handled the full list of 2,302 performance checks. It processed 570.7 billion gas across three minutes and fifteen seconds, roughly 2.9 billion gas per second on the client side. Those figures matter because they show one major execution client can keep pace when block rules change.
The test also checked block-level access lists. Nodes can now prefetch state data and handle unrelated transactions at the same time. That design choice supports parallel work and cuts wasted effort inside each block.
Capacity Check on Testnet Only
Roughly one hour after the testnet went live, the block gas limit rose from 60 million to 200 million. The move stayed inside the test environment. No one treats the higher number as a mainnet promise yet. The goal is simply to give each block more room for payments and swaps when activity spikes.
CoinGecko showed majors holding steady on the same day. Bitcoin sat near 76,419 dollars, up 0.90 percent in twenty-four hours. Ethereum traded around 2,446.70 dollars, up 2.12 percent. Solana reached 101.48 dollars, up 3.93 percent. Dogecoin printed 0.081534 dollars, up 1.86 percent. The moves stayed modest while attention stayed on the protocol test.
Ethics of Clear Communication
The September 17 update separates the rehearsal result from any future calendar. A proposed October 6 Sepolia deployment still needs formal confirmation. That distinction keeps expectations realistic and avoids mixing a successful dry run with a locked mainnet date.
Readers following protocol work benefit when reports stay precise about what happened on testnet versus what remains unconfirmed. The Glamsterdam team has kept that line clear so far.
What Comes Next
Teams can now review how the new gas limit and access-list changes behave under normal conditions. More testnet work is expected before any public Sepolia step. The focus stays on steady validation rather than speed to mainnet.
This rehearsal adds one more data point that the upgrade path is holding together. Builders watching the process see consistent client performance and a deliberate approach to capacity changes.