I think it's time to write about my problem with performance.

At the beginning I was just putting models to current map and drawing them. With 100 models on screen I've got 30 fps what was maximum fps for WP game.

Later I found way to draw realistic real-time shadows. (Matrix.CreateShadow()). It creates 2D object projected on plane, from 3D model. For shadows its needs transparency and change stencil state to draw binary (0 or 1) to prevent multilayered shadows. But this method required draw whole model again.

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