# :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: a3493defbc6a3a50a4e2fbf5cc1b2e51205cc94e | Previous: c21ded4600d20abaa4cf59baaa4fd7ff832a7bbc | Ratio | |-|-|-|-| | `benchmarks/common/common_ops_test.py::test_membership_stacked_nested_last` | `75448.96286408497` iter/sec (`stddev: 9.143071678840789e-7`) | `231606.51975156958` iter/sec (`stddev: 3.528242313624077e-7`) | `3.07` | | `benchmarks/common/common_ops_test.py::test_membership_stacked_nested_leaf_last` | `74693.3892447179` iter/sec (`stddev: 7.726010987554742e-7`) | `232940.6037365483` iter/sec (`stddev: 4.011178612554823e-7`) | `3.12` | 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/a3493defbc6a3a50a4e2fbf5cc1b2e51205cc94e#commitcomment-152842059

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 231606.51975156958 and current value is 75448.96286408497. It is 3.0697111127795016x worse than previous exceeding a ratio threshold 2