如何预取一个在浏览器中返回JSON格式数据的ajax调用

I have a use case wherein I am making multiple ajax calls when the page loads. The initial load fires off an ajax request to the server that gets the data in JSON format, upon subsequent user clicks other ajax calls are fired that make database calls to compute the JSON on the server side , the browser typically is idle and waits for the JSON to be returned. I was thinking of some ways in which I might be able to speed up the execution of this from the application side. I have a use case wherein I am making multiple