# weights_rate_limit (/docs/hyperparameters/weights-rate-limit) `weights_rate_limit` (on chain: `WeightsSetRateLimit`) is the cooldown between a validator's weight submissions, measured in 12-second blocks. The default is 100 blocks (20 minutes). It keeps validators from churning weights every block, which would bloat chain state and make consensus inputs noisy. ## How it works [#how-it-works] The chain tracks each UID's last submission block (`LastUpdate`). `check_rate_limit` (`pallets/subtensor/src/subnets/weights.rs`) passes when `current_block - last_update >= weights_rate_limit`; a UID that has never submitted always passes. Too-frequent calls fail with `SettingWeightsTooFast`. Which call is limited depends on the commit-reveal setting. With commit-reveal off, the limit applies to `set_weights` itself. With it on, the limit applies to the **commit** (failing with `CommittingWeightsTooFast`), and the reveal is exempt — the commit already paid the cooldown, and updates `LastUpdate` at commit time. Because `LastUpdate` also feeds the [activity cutoff](/docs/hyperparameters/activity-cutoff), the rate limit bounds how fresh a validator's weights can be — a subnet's cutoff should comfortably exceed its rate limit. `btcli tx set-weights` (the `set_weights` intent) preflights this check: it reads `LastUpdate` before signing and, if you are inside the cooldown, fails immediately with the number of blocks (and approximate seconds) left to wait instead of submitting a doomed extrinsic. Drag the limit to see which submission attempts survive the cooldown: ## Reading and setting [#reading-and-setting] ```bash btcli sudo get --netuid N --name weights_rate_limit ``` Root/governance-only — not settable by the subnet owner. The value is a plain block count. ## Related [#related] * [`commit_reveal_weights_enabled`](/docs/hyperparameters/commit-reveal-weights-enabled) — decides whether the limit hits set or commit * [`min_allowed_weights`](/docs/hyperparameters/min-allowed-weights) — the floor on submission size * [`max_weights_limit`](/docs/hyperparameters/max-weights-limit) — cap on any single weight * [`activity_cutoff`](/docs/hyperparameters/activity-cutoff) — staleness window fed by the same LastUpdate * [`tempo`](/docs/hyperparameters/tempo) — how often submitted weights are consumed