The triangle of performance?

I'm thinking a lot about the adoption of a common project management pattern into the world of web performance. The iron triangle, about which  Jeff Atwood already wrote back in 2006,  is something

we all know about from our jobs. Now my question is, if there are other areas of our IT world, where a triangle choice pattern can be found. One, rather unfinished, example I found in the perspective of performance is the relation between data liveness, the response time and the load of the server. The relation is not perfect, as the "Server load" - "Liveness" does not fully oppose the "Response time", but it might be a start for a discussion, if there are such patterns and where they reside. Do you have other examples? I'd like to hear them.