For single-page applications, the performance of AJAX calls is monitored with Site24x7 real user monitoring (RUM) by default. These calls are not monitored by default for traditional web apps. Nevertheless, you can still monitor the performance of AJAX calls in your traditional web applications by including an additional code snippet in your existing RUM code. Here's how you can do it.
For traditional applications, every AJAX call is counted as a pageview. You can see the number of pageviews consumed by AJAX calls in the Summary tab.