Currently, the Grid will re-render all of its DOM elements when the data is changed even if only the value of one cell is changed.
In these scenarios, we can suggest using serverPaging as this will fetch only the selected page and the re-render will be faster.
I made an example where the Grid with serverPaging is refreshed often and the re-render is almost instant:
As the post is marked for the MVC Grid, that Grid is with server operations true by default and should perform the same way the jQuery Grid is performing with serverPaging.
If additional assistance is needed, please provide a live URL, so we can inspect what may be causing the delay.