# :warning: **Performance Alert** :warning: Possible performance regression was detected for benchmark **'CPU Benchmark Results'**. Benchmark result of this commit is worse than the previous benchmark result exceeding threshold `2`. | Benchmark suite | Current: bbd5ba8d24fb2032d8507f7604c2dbe7070c730a | Previous: ad0a8dd5693504c8a028ec300404d42490aed16b | Ratio | |-|-|-|-| | `benchmarks/common/common_ops_test.py::test_membership_stacked_nested_last` | `75380.7532361309` iter/sec (`stddev: 0.000001321250127301775`) | `235391.76891241295` iter/sec (`stddev: 3.2118570721111605e-7`) | `3.12` | | `benchmarks/common/common_ops_test.py::test_membership_stacked_nested_leaf_last` | `75527.82174950559` iter/sec (`stddev: 8.796865387755741e-7`) | `233546.6655456368` iter/sec (`stddev: 4.175278496273709e-7`) | `3.09` | This comment was automatically generated by [workflow](https://github.com/pytorch/tensordict/actions?query=workflow%3AContinuous%20Benchmark) using [github-action-benchmark](https://github.com/marketplace/actions/continuous-benchmark). CC: @vmoens Comment was generated at https://github.com/pytorch/tensordict/commit/bbd5ba8d24fb2032d8507f7604c2dbe7070c730a#commitcomment-152789899

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The Ubuntu-20.04 brownout takes place from 2025-02-01. For more details, see https://github.com/actions/runner-images/issues/11101

Performance alert! Previous value was 235391.76891241295 and current value is 75380.7532361309. It is 3.122703857509172x worse than previous exceeding a ratio threshold 2