# Expresses the impact of using setStatsSampleRate / topology.stats.sample.rate

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`topology.stats.sample.rate`

configures the rate at which the Storm topology statistics will be calculated.

The default in defaults.yaml is `0.05`

. This means that only five out of 100 events are counted.

The value `1`

means that each tuple statistic will be calculated.

Will it really hurt performance? Most likely, many will say yes, but since every environment is different, I would say it's best to measure it yourself. Increase and decrease the value and measure the bandwidth of your topology.

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