I was wondering, where the f did you get some of your meshes? I was checking a few of them out in nifskope and I happened to notice that the baskets are OVER NINE THOUSAND (LOL) polys. I think I could make them look almost as good at about one thousand. I also looked at the urns and just the neck alone is about 4k polys. It looks to me like 3/4 of them don't even affect the shape of the mesh. From what I remember, the average building in a Skyrim city is about 10-15k. I think these are in need of some optimization.
I'm currently working on some high-poly Telvanni meshes. I've increased a few of them from about 500-1k polys up to 3k-4k, and with only a dozen or so in loaded cells it can drop fps by as much as 5 (on Morrowind's engine). Obviously Skyrim's engine is a lot more powerful, but having that many polys is certainly going to impact performance.
I'll likely be lurking aroud these forums from time to time, and when I release my mesh pack on Nexus I'll post here so you can use them if you want to.

Yeah, a lot of the clutter
Yeah, a lot of the clutter isn't optimized, that's why bottles ctd people when they enter buildings and such.