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closeups on Mipmapping

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Hi, I''m writing a demo in which the camera is moving around some trees. I used mipmapping for the tree model''s textures and i noticed that when the camera moves closer to the mipmapped texture the fps drops down by almost 30%. I''m using a 256x256 pixels bitmap for the texture. When i''m viewing the tree models from a distance there seem to be no problem with the fps. Anyone ever had this problem and knows how to fix it ?

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Does it also happen when you don''t use mipmaping ? It seems pretty logicial : when you come closer to the tree, it takes a bigger area on the viewport, therefore eating more fillrate and bringing the FPS down.

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What is your fps to begin with? A drop in fps from 1500 to 1050 is nothing. You are probably just becoming fill-rate limited when objects are close up on the screen.

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