diff --git a/.gitignore b/.gitignore
index 2f368a4..454f5e5 100644
--- a/.gitignore
+++ b/.gitignore
@@ -5,3 +5,9 @@ dist/
 build/
 *.egg-info/
 artifacts/
+
+# Node / Playwright UI test artifacts (tests/ui)
+node_modules/
+playwright-report/
+test-results/
+.playwright/
diff --git a/src/cas_evals/reference_product.py b/src/cas_evals/reference_product.py
index 49ec38b..165c4d2 100644
--- a/src/cas_evals/reference_product.py
+++ b/src/cas_evals/reference_product.py
@@ -2,6 +2,7 @@
 
 from __future__ import annotations
 
+import concurrent.futures
 import hashlib
 import json
 from collections.abc import Callable
@@ -122,9 +123,8 @@ def evaluate_reference_suite(
     suite = json.loads(fixture_path.read_text(encoding="utf-8"))
     released_at = suite.get("releasedAt", DEFAULT_RELEASED_AT)
     invoke = transport or _http_transport(endpoint, timeout_seconds)
-    evaluated = []
 
-    for source_case in suite["cases"]:
+    def process_case(source_case: dict[str, Any]) -> tuple[dict[str, Any], dict[str, Any]]:
         envelope = _build_envelope(source_case, suite["suiteId"], released_at)
         output, events = _validate_response(invoke(envelope), envelope)
         live_case = {**source_case, "response": output}
@@ -142,17 +142,18 @@ def evaluate_reference_suite(
                 "normalization": "fixture-observed",
             },
         }
-        evaluated.append(
-            _evaluate_case_with_evidence(
-                live_case,
-                suite["suiteId"],
-                released_at,
-                source_case=source_case,
-                metadata=envelope,
-                execution_evidence=evidence,
-            )
+        return _evaluate_case_with_evidence(
+            live_case,
+            suite["suiteId"],
+            released_at,
+            source_case=source_case,
+            metadata=envelope,
+            execution_evidence=evidence,
         )
 
+    with concurrent.futures.ThreadPoolExecutor(max_workers=10) as executor:
+        evaluated = list(executor.map(process_case, suite["cases"]))
+
     results = [result for result, _ in evaluated]
     return {
         "schemaVersion": "0.2.0",
diff --git a/tests/ui/package-lock.json b/tests/ui/package-lock.json
new file mode 100644
index 0000000..c1961bf
--- /dev/null
+++ b/tests/ui/package-lock.json
@@ -0,0 +1,96 @@
+{
+  "name": "cas-ui-evals",
+  "version": "1.0.0",
+  "lockfileVersion": 3,
+  "requires": true,
+  "packages": {
+    "": {
+      "name": "cas-ui-evals",
+      "version": "1.0.0",
+      "devDependencies": {
+        "@playwright/test": "^1.42.0",
+        "@types/node": "^20.0.0"
+      }
+    },
+    "node_modules/@playwright/test": {
+      "version": "1.61.1",
+      "resolved": "https://registry.npmjs.org/@playwright/test/-/test-1.61.1.tgz",
+      "integrity": "sha512-8nKv6+0RJSL9FE4jYOEGXnPeM/Hg12qZpmqzZjRh3qM0Y7c3z1mrOTfFLids72RDQYVh9WpLEfR5WdpNX4fkig==",
+      "dev": true,
+      "license": "Apache-2.0",
+      "dependencies": {
+        "playwright": "1.61.1"
+      },
+      "bin": {
+        "playwright": "cli.js"
+      },
+      "engines": {
+        "node": ">=18"
+      }
+    },
+    "node_modules/@types/node": {
+      "version": "20.19.43",
+      "resolved": "https://registry.npmjs.org/@types/node/-/node-20.19.43.tgz",
+      "integrity": "sha512-6oYBAi5ikg4Pl+kGsoYtawUMBT2zZMCvPNF7pVLnHZfd1zf38DRiWn/gT01RYCdUqkv7Fhr+C9ot4/tb+2sVvA==",
+      "dev": true,
+      "license": "MIT",
+      "dependencies": {
+        "undici-types": "~6.21.0"
+      }
+    },
+    "node_modules/fsevents": {
+      "version": "2.3.2",
+      "resolved": "https://registry.npmjs.org/fsevents/-/fsevents-2.3.2.tgz",
+      "integrity": "sha512-xiqMQR4xAeHTuB9uWm+fFRcIOgKBMiOBP+eXiyT7jsgVCq1bkVygt00oASowB7EdtpOHaaPgKt812P9ab+DDKA==",
+      "dev": true,
+      "hasInstallScript": true,
+      "license": "MIT",
+      "optional": true,
+      "os": [
+        "darwin"
+      ],
+      "engines": {
+        "node": "^8.16.0 || ^10.6.0 || >=11.0.0"
+      }
+    },
+    "node_modules/playwright": {
+      "version": "1.61.1",
+      "resolved": "https://registry.npmjs.org/playwright/-/playwright-1.61.1.tgz",
+      "integrity": "sha512-DWnY5o3YbLWK4GovuAVwpqL+1VwGNdUGrRr++8j8PtQQzvAVZUIMjKQ90fY689sEJZJBbZVw1rXaOKSTitkzPQ==",
+      "dev": true,
+      "license": "Apache-2.0",
+      "dependencies": {
+        "playwright-core": "1.61.1"
+      },
+      "bin": {
+        "playwright": "cli.js"
+      },
+      "engines": {
+        "node": ">=18"
+      },
+      "optionalDependencies": {
+        "fsevents": "2.3.2"
+      }
+    },
+    "node_modules/playwright-core": {
+      "version": "1.61.1",
+      "resolved": "https://registry.npmjs.org/playwright-core/-/playwright-core-1.61.1.tgz",
+      "integrity": "sha512-h7Qlt6m4REp25qvIdvbDtVmD4LqVXfpRxhORv9L0jzETM05p4fuPJ3dKyuSXQxDSbXnmS79HAgi9589lGSpLkg==",
+      "dev": true,
+      "license": "Apache-2.0",
+      "bin": {
+        "playwright-core": "cli.js"
+      },
+      "engines": {
+        "node": ">=18"
+      }
+    },
+    "node_modules/undici-types": {
+      "version": "6.21.0",
+      "resolved": "https://registry.npmjs.org/undici-types/-/undici-types-6.21.0.tgz",
+      "integrity": "sha512-iwDZqg0QAGrg9Rav5H4n0M64c3mkR59cJ6wQp+7C4nI0gsmExaedaYLNO44eT4AtBBwjbTiGPMlt2Md0T9H9JQ==",
+      "dev": true,
+      "license": "MIT"
+    }
+  }
+}