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Converting to DirectX 9.0

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Hello, I am new in this chat, but full of hope for explainations... I migrated my 3D engine from DX8.1 to DX9.0, but now my rendering engine FPS dropped to 6fps in D3DCREATE_SOFTWARE_VERTEXPROCESSING mode, whereas it used to be around 60fps. In D3DCREATE_HARDWARE_VERTEXPROCESSING, I have no performance problem. Could you please explain what is wrong. Many thanks in advance for your help. Regards, David

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