Hello am also having the same problem 
I am using the latest build 4.0-7952. Am playing windwaker with Hypatia's texture pack found here: http://onthegreatsea.tumblr.com/DOWNLOADS Am also suspecting LumbeeSlayer is also using the same pack!
Am getting around 15 fps just like LumbeeSlayer with Direct 3D at 4x resolution, with the texture pack enabled. If I disable the texture pack at that res, game runs full speed. I also can play at 8x resolution with the texture pack disabled which is weird with no fps drop at all. But when I enable the pack, game runs slow at any res higher then 3x.
But you see if I play with OpenGL I can definitely play with the texture pack on even at 8x resolution with no fps drops! OpenGL runs perfect at any res with the texture pack enabled. But with Direct3D its slow unless I disable the texture pack at anything higher then 3x resolution. Direct3D is the issue, the way it is handling texture packs at any res higher then 3x. It has to be. How come I can play at 8x with the texture pack on with no fps drops with OpenGL. But when I try the same thing with Direct3D, extreme fps drop, 5 to be exact. Point blank, playing at any res higher then 3x with the texture pack enabled resorts in extreme fps drop with Direct 3D. OpenGL doesn't have this issue what so ever.
I am using the latest build 4.0-7952. Am playing windwaker with Hypatia's texture pack found here: http://onthegreatsea.tumblr.com/DOWNLOADS Am also suspecting LumbeeSlayer is also using the same pack!
Am getting around 15 fps just like LumbeeSlayer with Direct 3D at 4x resolution, with the texture pack enabled. If I disable the texture pack at that res, game runs full speed. I also can play at 8x resolution with the texture pack disabled which is weird with no fps drop at all. But when I enable the pack, game runs slow at any res higher then 3x.
But you see if I play with OpenGL I can definitely play with the texture pack on even at 8x resolution with no fps drops! OpenGL runs perfect at any res with the texture pack enabled. But with Direct3D its slow unless I disable the texture pack at anything higher then 3x resolution. Direct3D is the issue, the way it is handling texture packs at any res higher then 3x. It has to be. How come I can play at 8x with the texture pack on with no fps drops with OpenGL. But when I try the same thing with Direct3D, extreme fps drop, 5 to be exact. Point blank, playing at any res higher then 3x with the texture pack enabled resorts in extreme fps drop with Direct 3D. OpenGL doesn't have this issue what so ever.