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I guess you can figure out what am I trying recreate. I don't have the required models to put some "life" in the map, but it looks pretty damn good for me so far (but I'm not sure about the stairs...). But now the map is laggy. Too laggy- maybe around 10 FPS from this angle on an average gaming PC from 2010. I know it's inevitable to lag a bit on a large map, but I have played a more complex map on a weaker PC with 15-20 FPS in the worst case. Most of the faces' textures are extended 2 times in height and 2 times in width. The engine is the good ol' Half Life 1 engine. Does anyone have any idea how to make things easier for calculating?