The ≤1μs latency checks in test_streaming_differentiator and test_batch_differentiator fail under CPU contention during parallel workspace test runs. These are correctness tests, not benchmarks — latency validation is already covered by the dedicated (and #[ignore]d) test_differentiator_with_history benchmark. Co-Authored-By: Claude Opus 4.6 <noreply@anthropic.com>