diff --git a/symeval/_modidx.py b/symeval/_modidx.py
index 4ffc97e..3f54d3d 100644
--- a/symeval/_modidx.py
+++ b/symeval/_modidx.py
@@ -65,6 +65,6 @@
                               'symeval.core.norm_str2bool': ('core.html#norm_str2bool', 'symeval/core.py'),
                               'symeval.core.norm_str2weekday': ('core.html#norm_str2weekday', 'symeval/core.py'),
                               'symeval.core.parse': ('core.html#parse', 'symeval/core.py'),
-                              'symeval.core.process_tasks': ('core.html#process_tasks', 'symeval/core.py'),
                               'symeval.core.rm_latex_env': ('core.html#rm_latex_env', 'symeval/core.py'),
-                              'symeval.core.run_with_timeout': ('core.html#run_with_timeout', 'symeval/core.py')}}}
+                              'symeval.core.run_with_timeout': ('core.html#run_with_timeout', 'symeval/core.py'),
+                              'symeval.core.task_wrapper': ('core.html#task_wrapper', 'symeval/core.py')}}}
diff --git a/symeval/core.py b/symeval/core.py
index 4d02e95..a31463e 100644
--- a/symeval/core.py
+++ b/symeval/core.py
@@ -282,9 +282,9 @@ def batch_extract_ans(
         answers: List[str] = batch_exec(
             self.extract_ans,
             [{"resp_str": resp} for resp in resps],
-            self.n_procs,
-            self.timeout,
-            self.use_tqdm,
+            n_procs=self.n_procs,
+            timeout=self.timeout,
+            use_tqdm=self.use_tqdm,
             desc="Extracting",
             def_val="",
         )
@@ -306,9 +306,9 @@ def batch_eq(
                 {"ref_ans": ref_ans, "pred": pred}
                 for ref_ans, pred in uniq_ref_pref_ans_pairs
             ],
-            self.n_procs,
-            self.timeout,
-            self.use_tqdm,
+            n_procs=self.n_procs,
+            timeout=self.timeout,
+            use_tqdm=self.use_tqdm,
             desc="Judging",
             def_val=False,
         )
@@ -377,103 +377,43 @@ def batch_exec(
     use_tqdm: bool = True,
     desc: str = "Processing",
     def_val: Any = None,
+    max_tasks_per_proc: int = 1024,
 ) -> List[Any]:
-    """Execute a function in batch using multiprocessing with efficient per-task timeout."""
+    """Execute a function in batch using `ProcessPool` with efficient per-task timeout."""
     n_samples: int = len(kwargs_list)
     n_procs = min(n_procs, n_samples)
 
-    # Shuffle the tasks
-    shuffled_tasks = list(enumerate(kwargs_list))
-    random.shuffle(shuffled_tasks)
-
-    # Split tasks into chunks for each process
-    chunk_size = -(-n_samples // n_procs)  # Ceiling division
-    task_chunks = [
-        shuffled_tasks[i : i + chunk_size] for i in range(0, n_samples, chunk_size)
-    ]
-
     results: List[Any] = [def_val] * n_samples
-    pbar: Optional[tqdm] = tqdm(total=n_samples, desc=desc) if use_tqdm else None
-
-    with ProcessPool(max_workers=n_procs) as pool:
+    with ProcessPool(max_workers=n_procs, max_tasks=max_tasks_per_proc) as pool:
         future = pool.map(
-            process_tasks,
-            task_chunks,
-            [func] * len(task_chunks),
-            [timeout] * len(task_chunks),
-            [def_val] * len(task_chunks),
+            task_wrapper, [func] * len(kwargs_list), kwargs_list, timeout=timeout
         )
         iterator = future.result()
+        # NOTE: This keeps the order
 
-        for chunk_results in iterator:
-            for idx, result in chunk_results:
-                results[idx] = result
-                if pbar:
-                    pbar.update(1)
-
-    if pbar:
-        pbar.close()
+        pbar: Optional[tqdm] = tqdm(total=n_samples, desc=desc) if use_tqdm else None
 
-    return results
-
-
-def process_tasks(
-    task_list: List[T_Tuple[int, T_Dict[str, Any]]],
-    func: Callable[..., Any],
-    timeout: int,
-    def_val: Any,
-) -> List[T_Tuple[int, Any]]:
-    pid: int = os.getpid()
-    print(f"Process {pid} is processing {len(task_list)} tasks")
-    results: List[T_Tuple[int, Any]] = []
-
-    def task_wrapper(idx: int, kwargs: T_Dict[str, Any]) -> T_Tuple[int, Any]:
-        try:
-            result = func(**kwargs)
-            return idx, result
-        except Exception:
-            return idx, def_val
-
-    with ThreadPool() as pool:
-        futures = [
-            pool.schedule(task_wrapper, args=(idx, kwargs)) for idx, kwargs in task_list
-        ]
-
-        for future in futures:
+        idx: int = 0
+        while idx < n_samples:
             try:
-                idx, result = future.result(timeout=timeout)
-            except TimeoutError:
-                idx = task_list[len(results)][0]
-                result = def_val
+                result: Any = next(iterator)
+                results[idx] = result
+            except StopIteration:
+                break
             except Exception:
-                idx = task_list[len(results)][0]
-                result = def_val
-            results.append((idx, result))
+                pass
+            if pbar is not None:
+                pbar.update(1)
+            idx += 1
+
+        if pbar:
+            pbar.close()
 
-    print(f"Process {pid} finished processing {len(task_list)} tasks")
     return results
 
 
-# def process_tasks(
-#     task_list: List[T_Tuple[int, T_Dict[str, Any]]],
-#     func: Callable[..., Any],
-#     timeout: int,
-#     def_val: Any,
-# ) -> List[T_Tuple[int, Any]]:
-#     pid: int = os.getpid()
-#     print(f"Process {pid} is processing {len(task_list)} tasks")
-#     results = []
-#     for idx, kwargs in task_list:
-#         result: Any
-#         try:
-#             result = run_with_timeout(func, kwargs, timeout)
-#         except TimeoutError:
-#             result = def_val
-#         except Exception:
-#             result = def_val
-#         results.append((idx, result))
-#     print(f"Process {pid} finished processing {len(task_list)} tasks")
-#     return results
+def task_wrapper(func: Callable[..., Any], kwargs: T_Dict[str, Any]) -> Any:
+    return func(**kwargs)
 
 
 def run_with_timeout(