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choose LIGHTING from the menu bar then select BASIC LIGHTING, it'll take a few seconds to many seconds to refresh all the screen elements, now press F11 to go back out of the editor.
This uses the basic lighting / video mode, and it should work better on your PC if you're video limited and have a half-decent processor for things. It won't help if the cpu is holding you back, though it will if the video board is.
This option doesn't save, so you'll have to do this whenever you run the level, or any super-large/visually demanding level.