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Why slow?

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I think retained D3D mode is slower than immediate mode but that's just a thought, I haven't tested it myself.
Immediate mode textures (DDraw surfaces) should be faster, I guess.

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I use ddraw surface. I blit to the surface and want d3drm to recognize the change and must call this function. Are that any other ways?

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Why are the IDirect3DRMTexture3::Changed so awfully slow? Are there any alternative ways? It´s sucking all resources in the game!

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RM is not too good with texturing in general . keep textures to powers of two and try not to load too many of them. group small textures together into 1 square texture.
P.S. I commend you for a wise user name (Gandalf)

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