You recently read about how RL professional visual designer Penny Patton can make Second Life look as good as Fallout 4, even on an older computer -- now read her step-by-step guide to doing that with a single building (this post-apocalyptic scrap house above) which she bought in the SL marketplace, through modding:
I realized that by setting the entire building to "no physics" and replacing the physics with an invisible shell of box prims set to "convex hull" I was able to save yet more land impact. This doesn't always work, but it works often enough to give it a try and here it ended up saving me a tonne of Land Impact points.... This scrap house is covered in various unique corrugated metal panels. They're not identical. Out of the box there's like 6-12 different panels each with it's own texture, spec map and normal map. All of which are 1024x1024. Each texture uses 4MB of memory on its own and it's simple arithmetic to see how that adds up. What I did was remove every type of panel except 2. Then I copied the remaining 2 panels to replace each of the panels I removed. Not difficult, but a little tedious and time consuming. But worth it!
How much worth it? This much:
Her tweaks reduced land impact from 241 to 123, and memory load of the shack from 360MB down to 207MB. "All of this means visitors to the sim get to experience higher framerates," she writes, "less lag, little if any texture thrashing and fast rez times!"
Her step-by-step is much more detailed, so you should read the whole thing. The real question is why most SL builders don't know about these optimization tips, and why Linden Lab doesn't teach them. But that's a topic for another post!