It's permanent in some areas. There is also an annoying delay rendering island furniture
I recorded a video (trust me, it's much worse, that day items were loading pretty fast actually)
Lol you did too much now your making your switch stutter. Hopefully they patch it where it is more smooth no matter how much stuff is out/done to island. They should be able to smooth it out hopefully. Mine doesn't stutter but I have done less with my island. I haven't put too many more items out after I had enough to turn town perfect. I think I'll hold off going too crazy till it is fixed.