reading xml file on client pc, created on server

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C#

C#4.0

ASP.NET4

I have some store raw material(equipments,hardware,etc.) data saved in sql database.
I have created an application(hosted on web) which displays the data from the database and directly displays it on browser using sqldatareader mainly.

The problem is that it takes a lot of time to load(sue to site traffic) and it does not show new data added by the store keeper unless the page is refreshed.
I hav set a timer, update panel and updatepanel progress control to update the page every 1 minute, but it shows the loading sign for a very long time.

I want to dynamically load the page and also the data to reduce
1.) the loading time
2.) update page without reloading when a data is added in the database

I am looking for something that can be done via client side programming.
Please provide help