diff --git a/scripts/check-snafu.py b/scripts/check-snafu.py
index b91950692b..662f6758d5 100644
--- a/scripts/check-snafu.py
+++ b/scripts/check-snafu.py
@@ -14,6 +14,7 @@
 
 import os
 import re
+from multiprocessing import Pool
 
 
 def find_rust_files(directory):
@@ -33,13 +34,11 @@ def extract_branch_names(file_content):
     return pattern.findall(file_content)
 
 
-def check_snafu_in_files(branch_name, rust_files):
+def check_snafu_in_files(branch_name, rust_files_content):
     branch_name_snafu = f"{branch_name}Snafu"
-    for rust_file in rust_files:
-        with open(rust_file, "r") as file:
-            content = file.read()
-            if branch_name_snafu in content:
-                return True
+    for content in rust_files_content.values():
+        if branch_name_snafu in content:
+            return True
     return False
 
 
@@ -49,21 +48,24 @@ def main():
 
     for error_file in error_files:
         with open(error_file, "r") as file:
-            content = file.read()
-            branch_names.extend(extract_branch_names(content))
+            branch_names.extend(extract_branch_names(file.read()))
 
-    unused_snafu = [
-        branch_name
-        for branch_name in branch_names
-        if not check_snafu_in_files(branch_name, other_rust_files)
-    ]
+    # Read all rust files into memory once
+    rust_files_content = {}
+    for rust_file in other_rust_files:
+        with open(rust_file, "r") as file:
+            rust_files_content[rust_file] = file.read()
+
+    with Pool() as pool:
+        results = pool.starmap(
+            check_snafu_in_files, [(bn, rust_files_content) for bn in branch_names]
+        )
+    unused_snafu = [bn for bn, found in zip(branch_names, results) if not found]
 
     if unused_snafu:
         print("Unused error variants:")
         for name in unused_snafu:
             print(name)
-
-    if unused_snafu:
         raise SystemExit(1)
 
 
diff --git a/src/common/datasource/tests/orc/write.py b/src/common/datasource/tests/orc/write.py
index f0e2792299..aa97c09a63 100644
--- a/src/common/datasource/tests/orc/write.py
+++ b/src/common/datasource/tests/orc/write.py
@@ -35,10 +35,23 @@ data = {
     "bigint_other": [5, -5, 1, 5, 5],
     "utf8_increase": ["a", "bb", "ccc", "dddd", "eeeee"],
     "utf8_decrease": ["eeeee", "dddd", "ccc", "bb", "a"],
-    "timestamp_simple": [datetime.datetime(2023, 4, 1, 20, 15, 30, 2000), datetime.datetime.fromtimestamp(int('1629617204525777000')/1000000000), datetime.datetime(2023, 1, 1), datetime.datetime(2023, 2, 1), datetime.datetime(2023, 3, 1)],
-    "date_simple": [datetime.date(2023, 4, 1), datetime.date(2023, 3, 1), datetime.date(2023, 1, 1), datetime.date(2023, 2, 1), datetime.date(2023, 3, 1)]
+    "timestamp_simple": [
+        datetime.datetime(2023, 4, 1, 20, 15, 30, 2000),
+        datetime.datetime.fromtimestamp(int("1629617204525777000") / 1000000000),
+        datetime.datetime(2023, 1, 1),
+        datetime.datetime(2023, 2, 1),
+        datetime.datetime(2023, 3, 1),
+    ],
+    "date_simple": [
+        datetime.date(2023, 4, 1),
+        datetime.date(2023, 3, 1),
+        datetime.date(2023, 1, 1),
+        datetime.date(2023, 2, 1),
+        datetime.date(2023, 3, 1),
+    ],
 }
 
+
 def infer_schema(data):
     schema = "struct<"
     for key, value in data.items():
@@ -56,7 +69,7 @@ def infer_schema(data):
         elif key.startswith("date"):
             dt = "date"
         else:
-            print(key,value,dt)
+            print(key, value, dt)
             raise NotImplementedError
         if key.startswith("double"):
             dt = "double"
@@ -68,7 +81,6 @@ def infer_schema(data):
     return schema
 
 
-
 def _write(
     schema: str,
     data,