technology
Nethermind Clears Full Test Suite During Glamsterdam Capacity Rehearsal
By Roll · Chief of Staff · 17 September 2026
Ethereum's Glamsterdam upgrade completed its latest testnet rehearsal this week, with the Nethermind client passing every performance check and the block gas limit moving from 60 million to 200 million on the controlled run.
Ethereum’s Glamsterdam upgrade has now cleared another controlled rehearsal that confirms blocks under the new builder rules and directly widens the room available inside each block.
What the rehearsal actually delivered
The test run lifted the block gas limit from 60 million to 200 million roughly one hour after the testnet went live. That change sits inside a single rehearsal setting only and does not carry over to mainnet. Holders stand to gain from the extra headroom because it allows more payments and swaps to sit inside one block before any activity surge pushes fees higher. The rehearsal also introduced block-level access lists so nodes can prefetch state and verify unrelated transactions in parallel, a structural shift that stays with the protocol once the upgrade moves forward.
Nethermind streak under the new rules
Nethermind finished the full 2,302 performance tests without a single failure. The client processed 570.7 billion gas in three minutes and fifteen seconds, which works out to roughly 2.9 billion gas per second inside the benchmark window. That run sits inside a deliberate rehearsal that avoided intentional attacks, so the numbers reflect steady execution rather than peak network load. The streak matters because it shows the client can stay in sync with the new block-building rules across a sustained window.
Path to the next controlled step
The rehearsal keeps the proposed October 6 Sepolia deployment on track, though that date still requires formal confirmation. Teams building on Ethereum now have a clearer view of how much extra capacity the upgrade will bring once it reaches the public testnet. The controlled nature of the run means developers can measure the exact lift in block space without guessing at edge cases.
Market snapshot alongside the test result
Spot prices on the day the rehearsal details surfaced showed Bitcoin near 76,419 dollars, up 0.90 percent over twenty-four hours. Ethereum traded around 2,446.70 dollars, up 2.12 percent in the same window. Solana sat near 101.48 dollars after a 3.93 percent gain, while Dogecoin held near 0.0815 dollars with a 1.86 percent move. These levels reflect steady positioning rather than any direct reaction to the test outcome.
Insider view on the ongoing sequence
The rehearsal fits inside a longer sequence of checks that have each passed without resetting the timeline. Participants already inside the testing loop can see the incremental gains in block capacity as the upgrade moves from one controlled environment to the next. The focus stays on what ships inside the next phase rather than on any unconfirmed mainnet date.
Holder takeaway from the capacity test
The direct product benefit for anyone holding or using Ethereum is the added space per block that reduces pressure during busy periods. That cushion comes from the gas limit adjustment tested in the rehearsal and from the parallel verification changes that Nethermind validated across its full test suite. The streak of clean results keeps the upgrade path intact and gives builders a measurable improvement to plan around once Sepolia testing opens.