by @raulk, 2026-08-08

Current network workload

Protocol

• Validators: ~1.07MM active validators.
• Committees: 64 committees active per slot; each validator is assigned to exactly one committee per epoch.
• Subnets: 64 ****gossipsub topics where committee members broadcast their individual attestations.

Data transferred

• Attestation size: 240 bytes uncompressed, ~192 bytes compressed.
• Attestation volume: ~535 attestations expected / subnet / slot.
• Total data: ~100KiB compressed data per subnet per slot (+ framing + overhead).

Network structure

• Beacon node count: ~13,000.
• Mesh size: ~400 beacon nodes per attnet (every beacon node by default subscribes to 2 subnets).
• Heavy use of the fanout. Attesters in a committee can be assigned to subnets other than their two “structural subnets”.

Observations (Maria Silva)

<aside> ⚠️

Since this data was originally shared, we traced down the long tail to specific validator pools. Some of them have already addressed this and the updated numbers look slightly better.

</aside>

Measurements for 3 missed slots (where attestation submission is tightly synchronized across all clients) on a single subnet.

Slot Timings — Preliminary Results — Maria Silva @ ACDC #161 (July 24, 2025)