YES! We ensure to improve WordPress server response time by using a cache plugin. By doing performance tweaks, we can help you get huge improvement in the performance to make your website load faster, but there are other reasons for slow response time of ajax calls, backend etc. which can be due to low server configuration or lack of proper coding or both and it will require detailed analysis of server configuration and code. We can surely help you fix that too. Get in touch with us and we’ll provide you a free consultation.