Close any other open programs when playing the game.
Turn your graphics down.
Turn your screen resolution down.
Turn you FOV down. Note: if this is low, you won't be able to see far away units, but they may be able to see you... (FOV = Field of View)
Turn the AI down (means AI on easy). Less AI means less CPU power for units and more for graphics.
or buy a new graphic card.
The game doesn't have a sky because eighter you are inside or underground or your FOV is too low to see it.
(I may not agree with thoughts posted under this name)
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