Is there a faster way to update a texture than using glTexSubImage. I want to draw a textured quad on screen, and occasionaly (sometimes every frame, sometimes not) update the contents of the texture used. I am using glTexSubImage to transfer the new data when it is changed but am finding it quite slow to transfer - the framerate drops somewhat sharply the more transfers I do per frame. I am using RGBA, UNSIGNED_BYTE for the transfer.