Does changing a window's transparency cause lag of any kind?
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It has to display a blend of both the current widnow and the window behind it when you offer non-opaque colors; I was going to respond yesterday but didn't bother. Yes, in most cases, it causes lag. It's a lot more client-side issues, I would guess. Some users don't support non-opaque windows either, which causes a lot of issues with the window(I've tested partialy transparent windows with little issues presented minus from out-of-date laptops; so I assume older-model graphics cards don't work well).
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The reason it causes client-lag is because using window transparency forces your game into "software rendering" mode, which relies on your computer's CPU and not its GPU; it's also a less efficient rendering mode.
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Ah, alright. Thanks.
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I once changed it and a lot of my players annoyed, it was a simple skin with low transparency and few buttons.