Due to the low end nature of the 6150SE video chip, you must run the game with everything set to optimize game performance.
Also note, due to the low end nature of the 6150SE, your CPU is doing most of the work, thus requiring the CPU to be doing as little as possible for anything outside the game. In other words, you must run a very clean system, as it pertains to background processes and CPU utilization.
One more thing. Do not run the game at the native resolution of your monitor. While it will look the best, the video chip cannot keep up with very high resolutions while running games. Set the game video resolution to 1024x768. It will look pretty bad, but it should make it playable.
There is just not much you can do with a $2 video chip. It is what it is.