diff --git a/packages/gooddata-eval/README.md b/packages/gooddata-eval/README.md
index 44733933f..0d9d7da27 100644
--- a/packages/gooddata-eval/README.md
+++ b/packages/gooddata-eval/README.md
@@ -91,6 +91,7 @@ Both provider name and provider id are accepted as the prefix.
 | Flag | Default | Description |
 |---|---|---|
 | `--runs K` | `2` | Independent runs per item (pass@K). An item passes if any run passes. |
+| `--concurrency K` | `1` | Number of items evaluated concurrently. `1` = sequential (default). Increase to load-test the agent under simultaneous requests. Progress output interleaves when K > 1. |
 
 #### Output
 
diff --git a/packages/gooddata-eval/src/gooddata_eval/cli/main.py b/packages/gooddata-eval/src/gooddata_eval/cli/main.py
index ff041f18b..95aa0d442 100644
--- a/packages/gooddata-eval/src/gooddata_eval/cli/main.py
+++ b/packages/gooddata-eval/src/gooddata_eval/cli/main.py
@@ -52,6 +52,13 @@ def _build_parser() -> argparse.ArgumentParser:
         ),
     )
     run.add_argument("--runs", type=int, default=2, help="Independent runs per item (pass@K). Default 2.")
+    run.add_argument(
+        "--concurrency",
+        type=int,
+        default=1,
+        help="Number of items evaluated concurrently (default 1 = sequential). "
+        "Increase to load-test the agent under simultaneous requests.",
+    )
     run.add_argument("--json", dest="json_path", help="Write a JSON report to this path.")
     run.add_argument("--quiet", action="store_true", help="Suppress per-item progress output.")
     run.add_argument(
@@ -270,6 +277,7 @@ def on_langfuse_item_done(
                     on_run_done=on_run_done,
                     on_item_done=on_item_done,
                     on_langfuse_item_done=on_langfuse_item_done,
+                    concurrency=config.concurrency,
                 )
             finally:
                 if hasattr(backend, "close"):
@@ -309,6 +317,9 @@ def on_langfuse_item_done(
 
 def main(argv: list[str] | None = None) -> int:
     args = parse_args(argv if argv is not None else sys.argv[1:])
+    if hasattr(args, "concurrency") and args.concurrency < 1:
+        print("error: --concurrency must be >= 1.", file=sys.stderr)
+        return _EXIT_OPERATIONAL_ERROR
     try:
         host, token = resolve_connection(host=args.host, token=args.token, profile=args.profile)
         if args.command == "models":
@@ -321,6 +332,7 @@ def main(argv: list[str] | None = None) -> int:
             langfuse_dataset=args.langfuse_dataset,
             models=args.models or [],
             runs=args.runs,
+            concurrency=args.concurrency,
             json_path=Path(args.json_path) if args.json_path else None,
             log_to_langfuse=args.langfuse,
             quiet=args.quiet,
diff --git a/packages/gooddata-eval/src/gooddata_eval/core/config.py b/packages/gooddata-eval/src/gooddata_eval/core/config.py
index 1effe8613..0d96d56d4 100644
--- a/packages/gooddata-eval/src/gooddata_eval/core/config.py
+++ b/packages/gooddata-eval/src/gooddata_eval/core/config.py
@@ -14,6 +14,7 @@ class RunConfig:
     langfuse_dataset: str | None = None
     models: list[str] = field(default_factory=list)
     runs: int = 2
+    concurrency: int = 1
     json_path: Path | None = None
     log_to_langfuse: bool = False
     quiet: bool = False
diff --git a/packages/gooddata-eval/src/gooddata_eval/core/reporting/console.py b/packages/gooddata-eval/src/gooddata_eval/core/reporting/console.py
index 316490a84..d16f94fe2 100644
--- a/packages/gooddata-eval/src/gooddata_eval/core/reporting/console.py
+++ b/packages/gooddata-eval/src/gooddata_eval/core/reporting/console.py
@@ -46,11 +46,16 @@ def render_console(report: EvalReport, *, console: Console | None = None) -> str
         table.add_row(item.id, item.test_kind, result, str(item.runs), latency, avg, quality, notes)
 
     out.print(table)
+    _wall = report.wall_clock_s
+    _agent = report.latency_s
+    if _wall > 0 and abs(_wall - _agent) > 1:  # concurrency > 1: show both
+        timing = f"{_wall:.2f}s wall-clock, {_agent:.2f}s agent time (avg {report.avg_latency_s:.2f}s/run)"
+    else:
+        timing = f"{_agent:.2f}s (avg {report.avg_latency_s:.2f}s/run)"
     out.print(
         f"\nSummary: {report.passed}/{report.total} passed "
         f"({report.skipped} skipped, {report.errored} errored) "
-        f"avg quality {report.avg_quality_score:.0%} "
-        f"in {report.latency_s:.2f}s (avg {report.avg_latency_s:.2f}s/run)"
+        f"avg quality {report.avg_quality_score:.0%} in {timing}"
     )
     return out.export_text() if out.record else ""
 
diff --git a/packages/gooddata-eval/src/gooddata_eval/core/reporting/json_report.py b/packages/gooddata-eval/src/gooddata_eval/core/reporting/json_report.py
index 1ad4a1cd7..bc6a28186 100644
--- a/packages/gooddata-eval/src/gooddata_eval/core/reporting/json_report.py
+++ b/packages/gooddata-eval/src/gooddata_eval/core/reporting/json_report.py
@@ -20,6 +20,7 @@ def _build_run_dict(report: EvalReport) -> dict:
             "errored": report.errored,
             "latency_s": round(report.latency_s, 3),
             "avg_latency_s": round(report.avg_latency_s, 3),
+            "wall_clock_s": round(report.wall_clock_s, 3),
         },
         "items": {
             item.id: {
diff --git a/packages/gooddata-eval/src/gooddata_eval/core/runner.py b/packages/gooddata-eval/src/gooddata_eval/core/runner.py
index 7fb0d36d6..9eaf47100 100644
--- a/packages/gooddata-eval/src/gooddata_eval/core/runner.py
+++ b/packages/gooddata-eval/src/gooddata_eval/core/runner.py
@@ -2,6 +2,8 @@
 """Dataset run orchestration: per item, K single-turn runs, route by test_kind, aggregate pass@K."""
 
 import time
+import traceback
+from concurrent.futures import ThreadPoolExecutor, as_completed
 from dataclasses import dataclass, field
 from functools import partial
 from typing import Callable, Protocol
@@ -52,6 +54,7 @@ class EvalReport:
     provider_type: str = ""
     workspace_id: str = ""
     items: list[ItemReport] = field(default_factory=list)
+    wall_clock_s: float = 0.0  # actual elapsed time; differs from latency_s under concurrency
 
     @property
     def total(self) -> int:
@@ -153,6 +156,7 @@ def run_items(
     on_run_done: Callable[[int, int, int, int, bool, float], None] | None = None,
     on_item_done: Callable[[int, int, ItemReport], None] | None = None,
     on_langfuse_item_done: Callable[[int, int, ItemReport], None] | None = None,
+    concurrency: int = 1,
 ) -> EvalReport:
     """Run every item K times, routing by test_kind, and aggregate pass@K.
 
@@ -162,19 +166,47 @@ def run_items(
       - on_run_done(index, total, run_index, runs, passed, latency) after each individual run
       - on_item_done(index, total, report)                         after an item is fully evaluated
       - on_langfuse_item_done(index, total, report)                after non-skipped, non-errored items only
+
+    concurrency > 1 dispatches items to a ThreadPoolExecutor so multiple
+    questions are sent to the agent simultaneously. Each item still runs
+    --runs times sequentially (pass@K). Results are collected in input order.
     """
+    concurrency = max(1, concurrency)
     report = EvalReport(
         model=model, provider_name=provider_name, provider_type=provider_type, workspace_id=workspace_id
     )
     total = len(items)
-    for index, item in enumerate(items, start=1):
-        if on_item_start is not None:
-            on_item_start(index, total, item)
+
+    def _process_item(index: int, item: DatasetItem) -> ItemReport:
+        try:
+            if on_item_start is not None:
+                on_item_start(index, total, item)
+        except Exception:  # non-fatal — callback must not abort a parallel run
+            traceback.print_exc()
         run_cb = partial(_forward_run_event, on_run_done, index, total) if on_run_done is not None else None
         item_report = _run_one_item(item, backend, runs, on_run_done=run_cb)
-        report.items.append(item_report)
-        if on_item_done is not None:
-            on_item_done(index, total, item_report)
-        if on_langfuse_item_done is not None and not item_report.skipped and item_report.error is None:
-            on_langfuse_item_done(index, total, item_report)
+        try:
+            if on_item_done is not None:
+                on_item_done(index, total, item_report)
+            if on_langfuse_item_done is not None and not item_report.skipped and item_report.error is None:
+                on_langfuse_item_done(index, total, item_report)
+        except Exception:  # non-fatal — log but don't abort
+            traceback.print_exc()
+        return item_report
+
+    _t0 = time.perf_counter()
+    if concurrency <= 1:
+        for index, item in enumerate(items, start=1):
+            report.items.append(_process_item(index, item))
+    else:
+        # Dispatch concurrently; collect in original order.
+        with ThreadPoolExecutor(max_workers=concurrency) as pool:
+            futures = {pool.submit(_process_item, index, item): index for index, item in enumerate(items, start=1)}
+            results: dict[int, ItemReport] = {}
+            for future in as_completed(futures):
+                idx = futures[future]
+                results[idx] = future.result()
+        for index in range(1, total + 1):
+            report.items.append(results[index])
+    report.wall_clock_s = time.perf_counter() - _t0
     return report
diff --git a/packages/gooddata-eval/tests/test_cli.py b/packages/gooddata-eval/tests/test_cli.py
index c99aa888d..04063d880 100644
--- a/packages/gooddata-eval/tests/test_cli.py
+++ b/packages/gooddata-eval/tests/test_cli.py
@@ -490,3 +490,43 @@ def test_parse_model_arg_plain_model_no_strip():
     # The no-slash path does not strip whitespace; argparse never passes
     # whitespace through, so this documents the current behaviour.
     assert _parse_model_arg(" gpt-5.2 ") == (None, " gpt-5.2 ")
+
+
+def test_cli_rejects_zero_concurrency(monkeypatch, fixtures_dir):
+    monkeypatch.setattr(cli_main, "resolve_connection", lambda host, token, profile: ("https://h", "tok"))
+    exit_code = cli_main.main(
+        [
+            "run",
+            "--host",
+            "https://h",
+            "--token",
+            "tok",
+            "--workspace",
+            "ws1",
+            "--dataset",
+            str(fixtures_dir / "sample_dataset"),
+            "--concurrency",
+            "0",
+        ]
+    )
+    assert exit_code == 2
+
+
+def test_cli_rejects_negative_concurrency(monkeypatch, fixtures_dir):
+    monkeypatch.setattr(cli_main, "resolve_connection", lambda host, token, profile: ("https://h", "tok"))
+    exit_code = cli_main.main(
+        [
+            "run",
+            "--host",
+            "https://h",
+            "--token",
+            "tok",
+            "--workspace",
+            "ws1",
+            "--dataset",
+            str(fixtures_dir / "sample_dataset"),
+            "--concurrency",
+            "-1",
+        ]
+    )
+    assert exit_code == 2
diff --git a/packages/gooddata-eval/tests/test_runner.py b/packages/gooddata-eval/tests/test_runner.py
index ede002043..5d8b6aad4 100644
--- a/packages/gooddata-eval/tests/test_runner.py
+++ b/packages/gooddata-eval/tests/test_runner.py
@@ -1,7 +1,9 @@
 # (C) 2026 GoodData Corporation
+import threading
+
 from gooddata_eval.core.evaluators import supported_test_kinds
 from gooddata_eval.core.models import ChatResult, DatasetItem
-from gooddata_eval.core.runner import run_items
+from gooddata_eval.core.runner import ItemReport, run_items
 
 
 def _viz_obj():
@@ -135,3 +137,112 @@ def test_run_items_does_not_invoke_langfuse_callback_for_skipped_items():
         on_langfuse_item_done=lambda idx, total, r: langfuse_calls.append(r.id),
     )
     assert langfuse_calls == []
+
+
+def test_run_items_concurrency_produces_all_results_in_order():
+    """With concurrency > 1 all items still appear in input order."""
+    items = [
+        DatasetItem(
+            id=f"item-{i}",
+            dataset_name="d",
+            test_kind="visualization",
+            question=f"q{i}",
+            expected_output={"visualization": _viz_obj()},
+        )
+        for i in range(6)
+    ]
+    backend = _FakeBackend([_chat_with(_viz_obj())] * 6)
+    report = run_items(items, backend, runs=1, concurrency=3)
+    assert report.total == 6
+    assert [r.id for r in report.items] == [f"item-{i}" for i in range(6)]
+    assert all(r.pass_at_k for r in report.items)
+
+
+def test_run_items_concurrency_1_and_sequential_produce_same_results():
+    """concurrency=1 and the default sequential path give identical reports."""
+    items = [
+        DatasetItem(
+            id=f"i{i}",
+            dataset_name="d",
+            test_kind="visualization",
+            question="q",
+            expected_output={"visualization": _viz_obj()},
+        )
+        for i in range(4)
+    ]
+    backend_a = _FakeBackend([_chat_with(_viz_obj())] * 4)
+    backend_b = _FakeBackend([_chat_with(_viz_obj())] * 4)
+    report_seq = run_items(items, backend_a, runs=1)
+    report_par = run_items(items, backend_b, runs=1, concurrency=1)
+    assert [r.id for r in report_seq.items] == [r.id for r in report_par.items]
+    assert [r.pass_at_k for r in report_seq.items] == [r.pass_at_k for r in report_par.items]
+
+
+def test_run_items_concurrency_errored_item_does_not_crash_pool():
+    """An errored item is recorded but does not abort a concurrent run."""
+
+    class _BoomBackend:
+        def ask(self, question: str) -> ChatResult:
+            raise RuntimeError("agent down")
+
+    items = [
+        DatasetItem(
+            id=f"e{i}",
+            dataset_name="d",
+            test_kind="visualization",
+            question="q",
+            expected_output={"visualization": _viz_obj()},
+        )
+        for i in range(4)
+    ]
+    report = run_items(items, _BoomBackend(), runs=1, concurrency=3)
+    assert report.total == 4
+    assert report.errored == 4
+    assert [r.id for r in report.items] == [f"e{i}" for i in range(4)]
+
+
+def test_run_items_concurrency_callbacks_fire_for_all_items():
+    """on_item_done is called exactly once per item under concurrency > 1."""
+    backend = _FakeBackend([_chat_with(_viz_obj())] * 5)
+    lock = threading.Lock()
+    done_ids: list = []
+
+    def on_done(index: int, total: int, report: ItemReport) -> None:
+        with lock:
+            done_ids.append(report.id)
+
+    items = [
+        DatasetItem(
+            id=f"c{i}",
+            dataset_name="d",
+            test_kind="visualization",
+            question="q",
+            expected_output={"visualization": _viz_obj()},
+        )
+        for i in range(5)
+    ]
+    run_items(items, backend, runs=1, concurrency=3, on_item_done=on_done)
+    assert sorted(done_ids) == [f"c{i}" for i in range(5)]
+
+
+def test_run_items_callback_exception_is_logged_not_swallowed(capsys):
+    """A raising callback prints a traceback to stderr but the run continues."""
+    backend = _FakeBackend([_chat_with(_viz_obj())] * 2)
+    items = [
+        DatasetItem(
+            id=f"x{i}",
+            dataset_name="d",
+            test_kind="visualization",
+            question="q",
+            expected_output={"visualization": _viz_obj()},
+        )
+        for i in range(2)
+    ]
+
+    def bad_callback(index, total, report):
+        raise RuntimeError("callback bug")
+
+    result = run_items(items, backend, runs=1, on_item_done=bad_callback)
+    assert result.total == 2  # run did not abort
+    err = capsys.readouterr().err
+    assert "RuntimeError" in err or "callback bug" in err  # traceback was printed