fix(ci): route hash timing test to performance lane

.github/workflows/test.yml

@@ -437,7 +437,7 @@ jobs:
     if: needs.changes.outputs.integration == 'true' || needs.changes.outputs.python == 'true' || needs.changes.outputs.workflows == 'true'
     runs-on: ubuntu-latest
     # Coverage runs in dedicated shards below, and the Python 3.12
-    # slow/integration/performance suite now runs in a separate parallel job.
+    # slow/integration suite now runs in a separate parallel job.
     timeout-minutes: 75
     strategy:
       fail-fast: false
@@ -535,9 +535,9 @@ jobs:
         run: |
           uv sync --extra all-ci
 
-      - name: Run slow, integration, and performance tests
+      - name: Run slow and integration tests
         run: |
-          uv run pytest tests -n auto -m "slow or integration or performance" --tb=short --durations=20
+          uv run pytest tests -n auto -m "(slow or integration) and not performance" --tb=short --durations=20
 
   coverage:
     name: Coverage (${{ matrix.shard }})

tests/test_perf_workflow.py

@@ -535,7 +535,7 @@ def test_python_ci_windows_matrix_shards_main_and_workflow_prs() -> None:
     assert "--modelaudit-shard-index ${{ matrix.shard-index }}" in exhaustive_run
 
 
-def test_python_ci_runs_slow_suite_in_a_separate_job() -> None:
+def test_python_ci_keeps_performance_out_of_the_xdist_slow_suite() -> None:
     workflow = _load_workflow("test.yml")
     jobs = _jobs(workflow)
 
@@ -545,13 +545,9 @@ def test_python_ci_runs_slow_suite_in_a_separate_job() -> None:
         "(github.event_name == 'pull_request' && contains(github.event.pull_request.labels.*.name, 'run-slow-tests'))"
     )
     slow_steps = slow_job["steps"]
-    assert (
-        '-m "slow or integration or performance"'
-        in _step_by_name(
-            slow_steps,
-            "Run slow, integration, and performance tests",
-        )["run"]
-    )
+    slow_run = _step_by_name(slow_steps, "Run slow and integration tests")["run"]
+    assert "pytest tests -n auto" in slow_run
+    assert '-m "(slow or integration) and not performance"' in slow_run
 
     fast_steps = jobs["test"]["steps"]
     fast_step_names = {step.get("name") for step in fast_steps}

tests/test_regular_scan_hash.py

@@ -1512,7 +1512,8 @@ def mock_hash(path: str, *, deadline: float | None = None) -> str:
         # files_scanned should include both files
         assert result.files_scanned == 2
 
-    def test_hash_generation_performance(self, tmp_path):
+    @pytest.mark.performance
+    def test_hash_generation_performance(self, tmp_path: Path) -> None:
         """Test that hash generation doesn't significantly impact performance."""
         import time
 

tests/test_xdist_status.py

@@ -324,6 +324,14 @@ def test_nightly_runs_unsharded_performance_and_rust_once_and_fails_closed() ->
         assert all("continue-on-error" not in step for step in job["steps"])
 
 
+def test_wall_clock_hash_generation_uses_dedicated_performance_lane() -> None:
+    from tests.test_regular_scan_hash import TestHashGenerationEdgeCases
+
+    marks = getattr(TestHashGenerationEdgeCases.test_hash_generation_performance, "pytestmark", ())
+
+    assert any(mark.name == "performance" for mark in marks)
+
+
 def test_nodeid_sharding_rejects_non_positive_count() -> None:
     root_conftest = _load_root_conftest()