dot net application is very slow in server

Hi,

 

I developed an asp .net application, it is working fast and good performance in the local systems. when i deployed in the server it is very very slow, even if i click a cancel button and it has no code in the .cs file it is taking 5-8  sec and more to close the popup screens.

 

If there is code on any button click it is taking too much time to load a page/ saving data/ retriving the data. if a we put runat="Server" to any control it is taking too much time. if i wrote any code in javascript/ jquery it is very fast like a charm!!!.

 

i have no chance to change the total code as of now. is there any solution to speedup the pages??

 

if i click a gridview button it is taking too much time to load an ajax popup window through rowcommand event, this is higer priority problem to rectify first. if any one give this issue solution it would be appriciable.