diff --git a/.github/scripts/aiter_prebuild_summary.py b/.github/scripts/aiter_prebuild_summary.py
new file mode 100644
index 0000000000..00570500b3
--- /dev/null
+++ b/.github/scripts/aiter_prebuild_summary.py
@@ -0,0 +1,87 @@
+#!/usr/bin/env python3
+"""Summarize Aiter prebuild timing from setup.py build logs."""
+
+from __future__ import annotations
+
+import argparse
+import glob
+import os
+import re
+from pathlib import Path
+
+FINISH_RE = re.compile(r"finish build \[([^\]]+)\], cost ([0-9.]+)s")
+
+
+def parse_module_costs(log_path: Path) -> list[tuple[str, float]]:
+    module_costs: list[tuple[str, float]] = []
+    try:
+        with log_path.open(encoding="utf-8", errors="replace") as log:
+            for line in log:
+                match = FINISH_RE.search(line)
+                if match:
+                    module_costs.append((match.group(1), float(match.group(2))))
+    except OSError as exc:
+        print(f"::warning::Unable to read prebuild log {log_path}: {exc}")
+    return module_costs
+
+
+def parse_args() -> argparse.Namespace:
+    parser = argparse.ArgumentParser(description=__doc__)
+    parser.add_argument(
+        "--log", required=True, type=Path, help="Path to the tee'd prebuild log"
+    )
+    parser.add_argument(
+        "--build-status", required=True, type=int, help="setup.py exit code"
+    )
+    parser.add_argument(
+        "--start", required=True, type=int, help="Prebuild start timestamp in seconds"
+    )
+    parser.add_argument(
+        "--end", required=True, type=int, help="Prebuild end timestamp in seconds"
+    )
+    parser.add_argument(
+        "--kernel-glob",
+        default="aiter/jit/*.so",
+        help="Glob used to count prebuilt kernel shared objects",
+    )
+    return parser.parse_args()
+
+
+def main() -> int:
+    args = parse_args()
+    module_costs = parse_module_costs(args.log)
+    kernels = sorted(glob.glob(args.kernel_glob))
+    wall_seconds = max(0, args.end - args.start)
+    total_module_seconds = sum(cost for _, cost in module_costs)
+
+    print("=== Aiter prebuild summary ===")
+    print(f"Runner: {os.environ.get('AITER_RUNNER_NAME', 'unknown')}")
+    print(f"GPU_ARCHS: {os.environ.get('GPU_ARCHS', 'unknown')}")
+    print(f"PREBUILD_KERNELS: {os.environ.get('PREBUILD_KERNELS', 'unknown')}")
+    print(f"MAX_JOBS: {os.environ.get('MAX_JOBS', 'unknown')}")
+    print(f"Build status: {args.build_status}")
+    print(f"Prebuild wall time: {wall_seconds}s ({wall_seconds / 60:.1f} min)")
+    print(f"Kernel count: {len(kernels)}")
+    print(f"Module builds observed: {len(module_costs)}")
+    print(
+        f"Total module compile cost: {total_module_seconds:.1f}s ({total_module_seconds / 60:.1f} min)"
+    )
+
+    if module_costs:
+        print("Top slowest module builds:")
+        for name, cost in sorted(module_costs, key=lambda item: item[1], reverse=True)[
+            :20
+        ]:
+            print(f"  {name}: {cost:.1f}s")
+
+        print("All module build costs (seconds):")
+        for name, cost in sorted(module_costs):
+            print(f"  {name}: {cost:.1f}")
+    else:
+        print("::warning::No module build cost lines were found in the prebuild log")
+
+    return 0
+
+
+if __name__ == "__main__":
+    raise SystemExit(main())
diff --git a/.github/workflows/aiter-test.yaml b/.github/workflows/aiter-test.yaml
index 6a71d8b7ae..b6fe9ac58d 100644
--- a/.github/workflows/aiter-test.yaml
+++ b/.github/workflows/aiter-test.yaml
@@ -26,6 +26,7 @@ env:
   GPU_ARCH_LIST: "gfx942;gfx950"
   AITER_TEST: "op_tests"
   AITER_WHEEL_ARTIFACT_NAME: aiter-whl-${{ github.run_id }}
+  AITER_PREBUILD_MAX_JOBS: "96"
 
 jobs:
   check-signal:
@@ -93,10 +94,13 @@ jobs:
           set -euo pipefail
           docker run --rm \
             --network=host \
+            -e AITER_PREBUILD_MAX_JOBS="${{ env.AITER_PREBUILD_MAX_JOBS }}" \
+            -e AITER_RUNNER_NAME="${RUNNER_NAME:-unknown}" \
             -v "${{ github.workspace }}:/workspace" \
             -w /workspace \
             ${{ env.DOCKER_IMAGE }} \
             bash -lc '
+              set -euo pipefail
               git config --global --add safe.directory /workspace &&
               git -C /workspace rev-parse HEAD >/dev/null &&
               shopt -s nullglob &&
@@ -107,11 +111,46 @@ jobs:
               pip install --upgrade "ninja>=1.11.1" &&
               pip install --upgrade setuptools_scm &&
               pip install tabulate &&
-              echo "Prebuilding kernels with GPU_ARCHS: ${{ env.GPU_ARCH_LIST }}, PREBUILD_KERNELS: 1, and MAX_JOBS: 128" &&
-              PREBUILD_KERNELS=1 MAX_JOBS=128 GPU_ARCHS="${{ env.GPU_ARCH_LIST }}" python setup.py bdist_wheel &&
+              echo "Prebuilding kernels with GPU_ARCHS: ${{ env.GPU_ARCH_LIST }}, PREBUILD_KERNELS: 1, and MAX_JOBS: ${AITER_PREBUILD_MAX_JOBS}" &&
+              export PREBUILD_KERNELS=1 &&
+              export MAX_JOBS="${AITER_PREBUILD_MAX_JOBS}" &&
+              export GPU_ARCHS="${{ env.GPU_ARCH_LIST }}" &&
+              prebuild_start=$(date +%s) &&
+              set +e &&
+              python setup.py bdist_wheel 2>&1 | tee .aiter-prebuild.log
+              build_status=${PIPESTATUS[0]}
+              set -e
+              prebuild_end=$(date +%s)
+              {
+                echo "BUILD_STATUS=${build_status}"
+                echo "PREBUILD_START=${prebuild_start}"
+                echo "PREBUILD_END=${prebuild_end}"
+              } > .aiter-prebuild.env
+              if [ "${build_status}" -ne 0 ]; then
+                exit "${build_status}"
+              fi
               ls -lh dist/*.whl
             '
 
+      - name: Summarize Aiter prebuild
+        if: ${{ always() }}
+        run: |
+          set -euo pipefail
+          if [ ! -f .aiter-prebuild.env ]; then
+            echo "::warning::Aiter prebuild metadata was not generated"
+            exit 0
+          fi
+          . ./.aiter-prebuild.env
+          AITER_RUNNER_NAME="${RUNNER_NAME:-unknown}" \
+          GPU_ARCHS="${{ env.GPU_ARCH_LIST }}" \
+          PREBUILD_KERNELS=1 \
+          MAX_JOBS="${{ env.AITER_PREBUILD_MAX_JOBS }}" \
+          python3 .github/scripts/aiter_prebuild_summary.py \
+            --log .aiter-prebuild.log \
+            --build-status "${BUILD_STATUS}" \
+            --start "${PREBUILD_START}" \
+            --end "${PREBUILD_END}"
+
       - name: Verify prebuilt kernels in wheel
         run: |
           set -euo pipefail