Question about island sims and peformance

Well,

Been considering getting an island sim. Ive noticed that some islands performance is really good and others lagging to the hilt. I'm curious to know what people think are the causes.

One specific question I have is related to rezzing and deleting prims. Bear with me a moment while I explain: people always prefer new sims over the old sims because of performance. I heard that as a sim gets used (lots of prim rezzing and deleting) it gets laggy. So my question is, if I own my own sim will the rezzing and deleting of objects over time cause my sim to degrade?

Thnx
Kiefer

Sims hold their entire lot of prim, texture and script data in RAM. This facilitates very fast manipulation and streaming of the data to clients. It also, necessarily, means that the more rezzed prims, applied textures, and active scripts you have in a sim, the less processing RAM it will have and the slower it will operate.

There are many complex server lag related forumlae that involve complex mathematical processing for physical interactions and such that we generally focus on when discussing simulator performance. But a little simple housekeeping, prim reduction, texture reuse and script hunting will go a long long way toward what you deem "reasonable" performance.