Hey, I'm working on my first own layout. I'm quiet confident referring to it gameplaywise (until the first test will crush it..). But when it comes to the technical part, please treat me like a five-year-old. I'm looking forward to the design-stage, as this is where my talents tend to. But it would be useful to have a list/ranking of what is bad for performance. This is meant in a really general way - a simple guideline of what to avoid or keep to a minimum. For example: Dynamics > Textures > Faces > Props > func_detail I am aware of this example not being correct (/making sense). As well as you can't tell that across-the-board. Because optimizing may relativise any of the objects. But a five-year-old needs to have it simple. A few more specific questions: Where is the difference in terms of performance between building a wall like this: Or this and making all the decorations a func_detail ? (though no more visleaves: more faces = more textures = bad?) Does it all come down to what gets rendered for the player in an area or does the overall size / object-count / triggered events have an impact on performance too? Do tool-brushes (except no-draw) influence performance? Is a wider variety of used textures worse or does this only affect file-size? -> Does file-size affect performance or only diskspace and download time? Prefer a prop over a brush? This is a very basic lack of understanding, I am aware. But some guideline to start with and learn the why's while doing, would help me a big deal. Thx in advance, Bud Insider: When I was about ten years old I wanted to work on my technical flaw and asked my cousin to give me a book about technics. ..in general. This has been a running gag between us ever since.