Implement a caching mechanism

templates/productList.html.twig

@@ -1,6 +1,7 @@
 {% extends "template.html.twig" %}
 
 {% block content %}
+{% cache 'list_' ~ listType %}
 <div class="table-responsive">
     <table class='table table-hover'>
         <thead>
@@ -57,4 +58,5 @@
         {% endfor %}
     </table>
 </div>
+{% endcache %}
 {% endblock %}