diff --git a/Lib/profiling/sampling/collector.py b/Lib/profiling/sampling/collector.py
index 7dc095c6c279bd..20748849425262 100644
--- a/Lib/profiling/sampling/collector.py
+++ b/Lib/profiling/sampling/collector.py
@@ -182,8 +182,7 @@ def _build_linear_stacks(self, leaf_task_ids, task_map, child_to_parent):
                 # Add all frames from all coroutines in this task
                 if task_info.coroutine_stack:
                     for coro_info in task_info.coroutine_stack:
-                        for frame in coro_info.call_stack:
-                            frames.append(frame)
+                        frames.extend(coro_info.call_stack)
 
                 # Get pre-computed parent info (no sorting needed!)
                 parent_info = child_to_parent.get(current_id)
diff --git a/Lib/profiling/sampling/sample.py b/Lib/profiling/sampling/sample.py
index c6abfb1c8ee885..8df9dd8aca5bdb 100644
--- a/Lib/profiling/sampling/sample.py
+++ b/Lib/profiling/sampling/sample.py
@@ -104,7 +104,7 @@ def sample(self, collector, duration_sec=None, *, async_aware=False):
                     sleep_time = (next_time - current_time) * 0.9
                     if sleep_time > 0.0001:
                         time.sleep(sleep_time)
-                elif next_time < current_time:
+                else:
                     try:
                         with _pause_threads(self.unwinder, self.blocking):
                             if async_aware == "all":
@@ -126,7 +126,7 @@ def sample(self, collector, duration_sec=None, *, async_aware=False):
                         raise e from None
 
                     # Track actual sampling intervals for real-time stats
-                    if num_samples > 0:
+                    if self.realtime_stats and num_samples > 0:
                         actual_interval = current_time - last_sample_time
                         self.sample_intervals.append(
                             1.0 / actual_interval
@@ -146,7 +146,7 @@ def sample(self, collector, duration_sec=None, *, async_aware=False):
                     num_samples += 1
                     next_time += sample_interval_sec
 
-                running_time_sec = time.perf_counter() - start_time
+                running_time_sec = current_time - start_time
         except KeyboardInterrupt:
             interrupted = True
             running_time_sec = time.perf_counter() - start_time