Yes I have! Or at least I did! I was inpatient and decided to pay someone on eBay to go to their treasure island to learn all the new DIY’s and catalog all the new items and I took some of the items home with me that were on the island - mostly street lamps you can buy with nook miles and were in a different color than what my island had. I probably took home 20-30 home and I put them up all over my island. BIG MISTAKE. I started to notice the lag big time and I couldn’t figure out what it was for the life of me, until I noticed one day while running past my campsite in an area where I didn’t have the lamp posts, I didn’t have the lag problem but as soon as I crossed the bridge towards my neighborhood and the lamp posts I instantly noticed the lag. I also remember back while I was on the treasure island it had super bad lagging issues just like I was experiencing and the guy who ran the treasure island even said I had to leave the island ever 15 minutes or else the game would “time out” and kick me off the island and I’d lose everything I had learned in that 15 minute interval. So after figuring that out I decided to collect up all my lamp posts and all the other items I took home (like new seasonal items, happy home paradise rewards, group stretching rewards, etc.) and sold them to the nook shop and I instantly noticed a huge change! I re-bought all the lamp posts and paid to have them customized by Reese and put the new ones up and the lag problem is gone! I still notice a slight frame drop by my nook shop but this sounds like a common thing others are experiencing as well.
I post this for everyone who may not have paid to visit a treasure island, but think back on if maybe you were gifted an item from/traded items with another person that you may have met on a forum like this, Reddit, Facebook group etc. who could have gotten their items from a treasure island. The way that I tested my theory of what lamp posts and other items were causing my lag issues was I took one lamp post to an area that was empty and free of any other items and I simply held B and ran around it a few times and if it was a glitched lamp post I would notice the lag and if it was one that I had bought previous to the treasure island I wouldn’t notice the lag and so I separated the glitched items from the non-glitched items and sold all the ones that gave me the lag.
I will say I don’t think it’s only items from a treasure island that will do this but I think it’s something to do with the new 2.0 items, as I haven’t experienced any issues in the past with items I received from treasure islands, but I think those items are more likely to cause major lag issues. Hopefully this helps anyone who is experiencing more intense lag issues like I was and anyone who wasn’t foolish enough to go to a treasure island but are now stuck with this lag due to a gifted/traded item from someone who did go to a treasure island
I also learned that cataloging is my new best friend!