no you can't. your integrated graphics can only support DX8. it will never use DX9, even if you install it. it will just keep running the DX8 codepath, since DX9 is backwards compatible to DX8 (and DX7, 6, 5, etc).
even if it CAN DX9, your performance will go down, since DX9 require better hardware.
EDIT: the reason why your system runs faster outside towns, is because the integrated graphics no longer have to render/animate all the other character models, which improves performance. your internet connection will have little, if anything, to do with it. bad internet connections CAN affect graphics performance, but only if your system is not limiting performance in the first place.
Last edited by moriz; Jul 04, 2008 at 03:44 PM // 15:44..
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