I need to open a modal popup page from a buttons click, and on that page based on some user input and post some computation logics I need to redirect to other pages. This is in context to Share Point custom solution development, over a visual web part.
Everything is working fine locally. But, once deployed to staging environment the response of the server is too slow. So, I need a way to notify the user about the Work In Progress, during redirection from one page to another page over modal popup. I can't use AJAX tool kit or update panel.
Can you suggest me a good approach to achieve the same.