Forum Discussion
@tcr1991 I replied to your other post, but now that I've read this one, it's easier to be more specific. Now you should have an alias for each installed pack in Applications. Additionally, files from each pack need to be in the package contents folder for IP; the path is shown in the video you've found. You can check to see what's there before you start moving anything, but the likelihood is that you'll have to add the files for those same three problem packs.
I want to reiterate too that purging memory is going to be critical with the packs you have installed. In fact, depending on your style of play and your graphics settings, you may be close to or over the RAM limit as soon as you load a new save. Pets and Seasons are especially demanding, but having this many EPs is going to require a lot of memory no matter what else you do.
https://bluebellflora.com/resetting-ram-during-gameplay/
Additionally, the version of Isla Paradiso that comes with the pack is so poorly made as to be almost unplayable, even on the strongest systems. You can download an edited version made available by a player named ciane, copy the fixes she described yourself, or use the features of IP in a different world.
https://forums.thesims.com/en_US/discussion/811253/removing-ip-lag
If you find that the RAM cap is too limiting for you to play properly, the only real solution is to play in Windows, either on another computer or via a partitioned hard drive (Bootcamp). I did this myself in the spring, and the game runs so much more smoothly than it ever did in mac OS. The only drawback is having to boot into Windows temporarily. I don't know if you'd be interested in this approach, or if you have the 256 GB+ free storage to accommodate the partition, but if you ever decide you're interested, it's not all that difficult a process.
Edit: I'm keeping this post and removing the duplicate in your other thread, since the subjects are a bit different. It's never a problem to add to your own thread, or to start a new one, but we try to consolidate or remove double posts as much as possible.
Second edit: I'm moving your post to the Sims/mac section.