diff --git a/.github/workflows/codspeed.yml b/.github/workflows/codspeed.yml
index 5cd4a2f..c835d05 100644
--- a/.github/workflows/codspeed.yml
+++ b/.github/workflows/codspeed.yml
@@ -19,7 +19,7 @@ jobs:
     strategy:
       matrix:
         shard: [1, 2, 3, 4]
-        mode: ["simulation", "walltime", "memory"]
+        mode: ["simulation"] # , "walltime", "memory"
 
     name: "Run ${{ matrix.mode }} benchmarks (Shard #${{ matrix.shard }})"
     runs-on: ${{ matrix.mode == 'walltime' && 'codspeed-macro' || 'ubuntu-24.04' }}
@@ -42,6 +42,8 @@ jobs:
         with:
           mode: ${{ matrix.mode }}
           run: uv run pytest tests/benchmarks/ --codspeed --test-group=${{ matrix.shard }} --test-group-count=${{ env.SHARDS }}
+          cache-instruments: false
+          runner-version: latest
 
   all-checks:
     runs-on: ubuntu-latest
diff --git a/src/pytest_codspeed/instruments/hooks/__init__.py b/src/pytest_codspeed/instruments/hooks/__init__.py
index 230aae8..975e809 100644
--- a/src/pytest_codspeed/instruments/hooks/__init__.py
+++ b/src/pytest_codspeed/instruments/hooks/__init__.py
@@ -244,5 +244,9 @@ def _callgrind_skip_python_runtime(self) -> None:
             None,
         )
         if libpython:
+            libpython = os.path.realpath(libpython)
+            print(f"Identified libpython for callgrind skipping: {libpython}")
             self._module.callgrind_add_obj_skip(libpython.encode())
-        self._module.callgrind_add_obj_skip(sys.executable.encode())
+        executable = os.path.realpath(sys.executable)
+        print(f"Skipping Python executable in callgrind: {executable}")
+        self._module.callgrind_add_obj_skip(executable.encode())