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GLSL Shadow map slowdowns

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Hi! I'm experiencing slowdowns with my shadow mapping code using GLSL (16-20fps on gf7800). I'm wondering if it may be because the render context is bound to a Windows control, both the display and the depthtexture. Would I gain speed if I used another buffer for the depthtexture and went fullscreen without the render context beeing bound to any Windows picture control? Thanks in advance!

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