Suggestions to make website fast by breaking a request in two parts
Why don't you use ajax function , post data to the server and when proccess to the server is done display the result to the html page
I am trying to speed up my website. So at the moment, controller fetches data from database, do calculation on data and display on view. 
what I plan to do is, controller/action fetches half the data and display to the view. Than come back to different controller/action and do calculation on data and display data on screen.
But what I want to know is once I fetch data and display on screen, how do I go back to controller automatically(without any click by user) to do calculations on same data.