diff --git a/myproject/customers/views.py b/myproject/customers/views.py
index f241d2b..368e0ba 100644
--- a/myproject/customers/views.py
+++ b/myproject/customers/views.py
@@ -2,7 +2,8 @@ from django.shortcuts import render, get_object_or_404, redirect
 from django.contrib import messages
 from django.core.paginator import Paginator
 from django.core.exceptions import ValidationError, PermissionDenied
-from django.db.models import Q
+from django.db.models import Q, Sum, F, Value, DecimalField
+from django.db.models.functions import Greatest, Coalesce
 from django.http import JsonResponse
 from django.views.decorators.http import require_http_methods
 from django.contrib.auth.decorators import login_required
@@ -86,9 +87,18 @@ def customer_detail(request, pk):
     if customer.is_system_customer:
         return render(request, 'customers/customer_system.html')
 
-    # Рассчитываем общий долг по активным заказам
-    active_orders = customer.orders.exclude(payment_status='paid')
-    total_debt = sum(order.amount_due for order in active_orders)
+    # Рассчитываем общий долг по активным заказам на стороне БД
+    total_debt_result = customer.orders.exclude(payment_status='paid').aggregate(
+        total_debt=Coalesce(
+            Sum(Greatest(F('total_amount') - F('amount_paid'), Value(0), output_field=DecimalField())),
+            Value(0),
+            output_field=DecimalField()
+        )
+    )
+    total_debt = total_debt_result['total_debt'] or Decimal('0')
+    
+    # Количество активных заказов
+    active_orders_count = customer.orders.exclude(payment_status='paid').count()
 
     # История транзакций кошелька (последние 20)
     from .models import WalletTransaction
@@ -96,8 +106,8 @@ def customer_detail(request, pk):
         customer=customer
     ).select_related('order', 'created_by').order_by('-created_at')[:20]
 
-    # История заказов с пагинацией
-    orders_list = customer.orders.all().order_by('-created_at')
+    # История заказов с пагинацией и оптимизацией запросов
+    orders_list = customer.orders.select_related('status').order_by('-created_at')
     paginator = Paginator(orders_list, 10)  # 10 заказов на страницу
     page_number = request.GET.get('page')
     orders_page = paginator.get_page(page_number)
@@ -105,7 +115,7 @@ def customer_detail(request, pk):
     context = {
         'customer': customer,
         'total_debt': total_debt,
-        'active_orders_count': active_orders.count(),
+        'active_orders_count': active_orders_count,
         'wallet_transactions': wallet_transactions,
         'orders_page': orders_page,
     }