I'm at about 558/600 items on my Amaya Lake property and when you first zone in it takes several seconds for all the trees I put in the yard to pop in.
This is why there is a furniture limit. They have to balance it against performance.
I would gladly wait a few more seconds for double or triple the amount of items allowed.
However the items don't take much storage place.the problem is with database storage.. not rendering...
How do I know this??
Have you entered Maelstrom arena?
It a replica of Hunding Hall but with 10x more items allowed and NOBODY has had a problrm rendering it... another thing... why a big statue counts the same as a small apple? this seems like a storage issue ans not a rendering one
So my guess is database storage....