Ethereum activated the Fusaka upgrade on Dec. 3, 2025, raising the network’s data availability capacity through Blob Parameter Overrides that incrementally expanded blob targets and maximums.
Two subsequent adjustments raised the target from 6 blobs per block to 10, then to 14, with a maximum ceiling of 21. The goal was to reduce layer-2 rollup costs by increasing throughput for blob data, the compressed transaction bundles that rollups post to Ethereum for security and finality.
Three months into data collection, the results reveal a gap between capacity and utilization. A MigaLabs analysis of over 750,000 slots since Fusaka’s activation shows that the network isn’t reaching the target blob count of 14.
Median blob usage actually declined after the first parameter adjustment, and blocks containing 16 or more blobs exhibit elevated miss rates, suggesting reliability degradation at the edges of new capacity.
The report’s conclusion is direct: no further increases in the blob parameter u
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