diff --git a/noxfile.py b/noxfile.py
index 7b489ef63..3e25b468c 100644
--- a/noxfile.py
+++ b/noxfile.py
@@ -21,13 +21,14 @@ BEHAVE_PARALLEL_URL = (
 
 
 def _default_processes() -> int:
+    env_override = os.environ.get("TEST_PROCESSES")
+    if env_override:
+        return int(env_override)
     try:
         cpus = len(os.sched_getaffinity(0)) or 1
     except AttributeError:
         cpus = os.cpu_count() or 1
-    # Cap parallelism to avoid excessive resource usage in constrained
-    # environments (CI containers, cgroups, etc.)
-    return min(cpus, 8)
+    return cpus
 
 
 def _behave_parallel_args(posargs: list[str]) -> list[str]:
@@ -46,10 +47,7 @@ def _pabot_parallel_args(posargs: list[str]) -> list[str]:
     )
     if has_custom_processes:
         return []
-    env_override = os.environ.get("PABOT_PROCESSES")
-    if env_override:
-        return ["--processes", env_override]
-    return ["--processes", str(min(_default_processes(), 2))]
+    return ["--processes", str(_default_processes())]
 
 
 def _split_pabot_args(posargs: list[str]) -> tuple[list[str], list[str]]:
@@ -474,43 +472,59 @@ COVERAGE_THRESHOLD = 97
 def coverage_report(session: nox.Session):
     """Generate coverage report from Behave tests.
 
-    Runs behave under coverage in serial mode to ensure accurate data
-    collection. Coverage threshold is enforced at >=97%.
+    Runs behave tests in parallel via behave-parallel (same approach as
+    unit_tests) with each worker collecting coverage independently using
+    ``coverage run --parallel-mode``.  After all workers finish, the
+    per-process data files are merged with ``coverage combine``.
+
+    Coverage threshold is enforced at >=97%.
 
     On success, emits: COVERAGE OK: <pct>% (threshold: 97%)
     On failure, emits: COVERAGE FAILED: <pct>% < 97% threshold
     Both are single-line, CI-parseable summary strings.
     """
     session.install("-e", ".[tests]")
+    _install_behave_parallel(session)
 
     os.makedirs("build", exist_ok=True)
 
     session.env["PYTHONPATH"] = str(Path("src").resolve())
     session.env["COVERAGE_RCFILE"] = "pyproject.toml"
     session.env["COVERAGE_FILE"] = "build/.coverage"
+    # Tell behave-parallel workers to run under coverage --parallel-mode
+    session.env["BEHAVE_PARALLEL_COVERAGE"] = "1"
 
     # Clean up any existing coverage data
     session.run("coverage", "erase")
 
-    # Run behave under coverage (serial mode for reliable data collection)
-    behave_args = [
-        "coverage",
-        "run",
-        "--source=src",
-        "-m",
-        "behave",
-        "-q",
-        "--tags=-discovery",
-        "--no-capture",
-    ]
+    # Run behave tests in parallel; each worker collects coverage separately
+    behave_cmd = session.bin + "/behave-parallel"
+    parallel_args = _behave_parallel_args(session.posargs)
 
     if session.posargs and session.posargs[0].endswith(".feature"):
-        behave_args.extend(session.posargs)
+        args = [
+            behave_cmd,
+            "-q",
+            "--tags=-discovery",
+            "--no-capture",
+            *parallel_args,
+            *session.posargs,
+        ]
     else:
-        behave_args.append("features/")
-        behave_args.extend(session.posargs)
+        args = [
+            behave_cmd,
+            "-q",
+            "--tags=-discovery",
+            "--no-capture",
+            *parallel_args,
+            "features/",
+            *session.posargs,
+        ]
 
-    session.run(*behave_args)
+    session.run(*args)
+
+    # Merge per-worker coverage data files into a single build/.coverage
+    session.run("coverage", "combine")
 
     # Always generate HTML and XML reports before checking threshold
     session.run("coverage", "html")