Stop the sorting functionality

Sorting is giving some performance issues for me when the number of records goes to around 2000 and more.(it takes around 10-15 secs) Is there a way to stop the sorting functionality and use only the other features like fixed & resizable headers from the activewidgets?

If yes, please help me with the code for doing this.

Else please suggest how we can improve the sorting speed, since my pages will definitely contain records from 100 to 2000 records.