She also documented the work she did, for those who'd rather fix IP themselves. A player named ciane has done all the edits necessary to make IP run smoothly and provided her save file for download to anyone who wants it. If you want to play in Isla Paradiso, you can edit the world yourself, or download a fixed version. The only thing to be careful of is inactive sims living in houseboats, as they can often have routing failures that cause the game to lag. There are numerous player-created worlds with islands and dive lots that you could download, or you could edit one of your own to suit your needs. The original world of IP is so poorly made that it's almost unplayable, but the features of the expansion pack work very well, and they can be placed in any world that has the space and deep enough water. (Yes, there were some more recent posts, but they didn't contain any useful new information.) I split your comment into its own thread because the original post and solution are several years old.
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