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D3DDISPLAYMODE and BackBufferFormat with 8.1

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Hi, I just installed 8.1 and I have this problem: My engine was doing 40 frames/sec with 8.0, and now it is only 8 frames/sec. Why? same code , same everything... with 8.0 I''m using : D3DPRESENT_PARAMETERS d3dpp; d3dpp.BackBufferFormat = D3DFMT_A8R8G8B8; and I got 40 f/s . same code with 8.1 give me only 8 f/s . I had to change it to D3DFMT_X8R8G8B8 to get only 20 f/s. Does anyone else have the same problems?

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I had this problem with my ATI Radeon. I had the old drivers installed when I upgraded to DirectX 8.1 and everything got terribly slow (like it was running through the refrast). But since I upgraded to the latest drivers, everything runs perfectly. So I guess your problem is driver related too.

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