Improve CPU usage reporting with actual per-process percent and enhanced diagnostics

main.py

@@ -2070,14 +2070,29 @@ class MainWindow(QtWidgets.QMainWindow):
             
             # === PROGRAM USAGE SECTION ===
             
-            # Program CPU usage (estimated based on process activity)
-            if memory_info.get('has_psutil', False) and hasattr(self, '_loop_times') and self._loop_times:
-                current_loop, max_loop, avg_loop = self._get_resource_stats(self._resource_history['loop_times'])
-                estimated_cpu = min(100, (current_loop / 50) * 10)  # Scale loop time to CPU estimate
-                program_cpu_text = f"CPU: ~{estimated_cpu:.1f}%\nLoop: {current_loop:.0f}ms"
-                program_cpu_color = colors['error'] if estimated_cpu > 20 else colors['warning'] if estimated_cpu > 10 else colors['success']
+            # Program CPU usage (actual per-process percent, smoothed via history)
+            if memory_info.get('has_psutil', False):
+                # Ensure history contains the latest sample (already appended earlier)
+                if self._resource_history['cpu_percent']:
+                    cur_cpu, max_cpu_p, avg_cpu_p = self._get_resource_stats(self._resource_history['cpu_percent'])
                 else:
-                program_cpu_text = "CPU: --\nNot running"
+                    cur_cpu = memory_info.get('cpu_percent', 0.0)
+                    max_cpu_p = avg_cpu_p = cur_cpu
+
+                # Loop timing (optional extra diagnostic)
+                loop_extra = ""
+                if hasattr(self, '_loop_times') and self._loop_times:
+                    loop_current = self._loop_times[-1] * 1000  # seconds -> ms
+                    loop_extra = f" | Loop {loop_current:.0f}ms"
+
+                program_cpu_text = f"CPU: {cur_cpu:.1f}%\nAvg: {avg_cpu_p:.1f}% | Max: {max_cpu_p:.1f}%{loop_extra}"
+                program_cpu_color = (
+                    colors['error'] if cur_cpu > 80 else
+                    colors['warning'] if cur_cpu > 60 else
+                    colors['success']
+                )
+            else:
+                program_cpu_text = "CPU: N/A\npsutil needed"
                 program_cpu_color = colors['text_light']
             
             self.program_cpu_label.setText(program_cpu_text)