Web Forms :: Display Cache Data Only Instead Of Server Side Code

I am working on page where data will update in every 10 second by scraping data from other Stock website. So basically page is displaying stock data which update in every 10 seconds. I am using update panel and timer control. Now problem is that if 100 users open the webpage 100 request go server in each 10 seconds. I want to implement Cache on page where Cache version of page serves to other user. I am using <%@ OutputCache Duration="10" VaryByControl="Timer1" %> but when event occur code run intends of delivering Cache version of page. What I am doing for test.

1) Open page in different browser in local

2) Checking browser type using code

Dim s As String = ""
With Request.Browser
s &= "IP = " & HttpContext.Current.Request.UserHostAddress & vbCrLf
s &= "Browser Name = " & .Browser & vbCrLf
End With
Label1.Text = s

if page first open in IE then if I again open in firefox it shows browser type IE but after 10 sec interval it will update type to firefox. So I want to display Cache data only instead of executing server side code for each different browser.