Based on what i've seen and the popularity on servers for disabling falling blocks to prevent lag and chunk corruption. I had really hoped SI was up there on the optimisation hit list. I was really concerned when they mention on one of the dev streams that they wanted to do some "Demolition" quests where you destroy/collapse a poi. Here is a video on A19 Nav of a small
remnant structure collapse. You can see the framerate went from 115-130 FPS before it started, then the frames where removed and it nose dives down to 45-50 FPS. That 1 feature killed nearly 90% of the starting performance and that's the smallest tier of quest poi's. Anyone what had the idea to collapse a skyscraper knows it's not a fun experience. Performance aside large collapses glitch out and you end up with floating blocks all happening at a less than cinematic framerate.
It even affects combat, here is a video of what happens to performance when you shoot a
block. This was in A17 but it is still an issue in A19, The number of people i've seen asking if it's possible to remove weapon block damage so they can use automatic weapons without the game turning into a 3 legged asthmatic hippo. You can see performance it cut in half when you damage a block. It does it anytime a block is damaged and si updates, this includes zombies so imagine 4 players with m60's and 16 zombies all whacking away during a hoard which is not an unreasonable situation.
I think rather than moving the load to the gpu maybe it's a better idea to not run that feature on a single core. 7DTD only scales in multicore performance up to 4 threads. This would be great in 2010, but these days 4 thread cpus are difficult to find new. Most modern cpus now are 6-8 cores and 12-16 threads. There is plenty of cpu gas in the tank these days but only if applications are made to take advantage of them. Core count and GPU performance has increases exponentially since 2013 but single thread performance hasn't changed that much.
Anyway that's my thought on SI

thanks for reading and i hope you'll at least give si a double take.