Required Field Validators strange problem of pageload??

[savvy]

I'm having some background graphics layout on the page and a table
layout on top of it. Inside the table i have two DropDownList menus
whose AutoPostBack Property is set to true and I'm using two Required
Field Validators for both the drop down menus. I dont know whats the
reason but everytime I change the dropdown menu the page takes a long
time to reload and moreover I can even see the whole background graphic
layout with no table layout at all during postback. But when I remove
the 2 Required Field Validators(RFV) its working fine I can see the
table layout during postback which I actually want. I can't understand
this strange problem of RFV's.
This is really annoying Is their any (RFV) property by which I can turn
this off ??
How can I overcome this problem ?