Reduce Page Size (tabcontainer, usercontrols, page validators)

Hello,
On my ASP.NET website I have a tabcontainer with 10 usercontrols.
The problem is that the page size of the main page is 459.000 bytes. I can compress(GZip) it to 125.000 but that's not enough. 
The biggest problem, in the source code, are the page validators of each usercontrol, total: 100.000 bytes
How could I reduce the page size?
Thanks!
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