This fixes the game menu, low FPS and alt+tab. It also allows you to play windowed without changing to 16-bit colors.
Place this file in your game folder: https://www.dropbox.com/s/598uwf0diwwsthh/ddraw.dll?dl=0
It reimplements the game in OpenGL.
Known bugs: Menus sometimes flicker.
Can someone test the performance of this fix? Does anyone get lag in-game?
Make sure you're running Win 8/8.1. This DLL seems to cause lag in-game with Windows 7.