VRAM resident textures are not meant for operations on them like a Mipmap replacement would be, only for being statically loaded.
As Mipmap replaces the texture depending on the view distance, this would slow things down drastically ( try it youself. do some texture operations on a normal texture and on a +256 texture, the 2nd one will be 100-200x slower. Blitz3D has to copy the texture from VRAM into SysRAM, alter it and send it back to VRAM which needs quite some time )
big10p: try the 60.80 or 61.80 drivers at http://www.laptopvideo2go.com , they are top :)
As Mipmap replaces the texture depending on the view distance, this would slow things down drastically ( try it youself. do some texture operations on a normal texture and on a +256 texture, the 2nd one will be 100-200x slower. Blitz3D has to copy the texture from VRAM into SysRAM, alter it and send it back to VRAM which needs quite some time )
big10p: try the 60.80 or 61.80 drivers at http://www.laptopvideo2go.com , they are top :)