It's kind of hard for moders to tell where their UI performance issues are coming from, but there's two important things to keep in mind:
1. Lots of polys are expensive, so don't do things like tile a 2 pixel texture.
2. Texture changes are expensive, so try to keep things on the same texture where possible. Since rendering is done bottom up you can sometimes reduce the number of texture changes by reordering your controls. This is basically why rendering icons one after another is expensive right now.
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