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Description
Game UI is expensive. Cost of rendering many UI elements is substantial. This can be easily seen with Diplomacy.wnd file. It opens when press TAB button in game. In a given 3D Scene that may cost ~1.0 ms, opening Diplomacy Window will add ~2.3 ms or 230% in the same test environment. Adding HIDDEN flag to STATUS on all elements in Diplomacy.wnd does reduce cost from 2.3 ms to 0.2 ms.
This applies to all UI windows. It should be looked into when code is available.