This problem has been around for a while and affected some Mac users but not all.
When you play your game the screen will flicker and changing certain graphics options in-game doesn’t fix it.
Edge Smoothing settings in the Graphics Options in-game.
Play around with the Edge Smoothing settings in the Graphics Options menu. Try turning it off if you have it on or lowering it if you have it on high. Also try raising it if you have it on low.
Thanks to the wonderful people who have confirmed the issue and solution over on this thread at AHQ.
Running macOS Mojave? Updated security settings in the operating system no longer permit Origin in-game to run. If you want to have it enabled please read this update – https://bluebellflora.com/2018/09/22/disabling-origin-in-game-is-the-way-forward/
Having Origin enabled in-game has always caused issues on Macs. As well as causing lagging issues it can also cause your game to not load, something which seems to be becoming more frequent amongst players. So the best thing to do is just disable it. Unfortunately you will have to do this after each Origin update as it annoyingly enables itself each time.
- Open Origin then click on Origin > Preferences in the menu bar
- Click on Origin in-game on the right side
- If Origin is enabled in-game the button will show green. Click on it to turn it off so it looks like the picture above.
- Right click on the game in your Games Library and select Game Properties. Uncheck the box next to Enable Origin In Game for The Sims 4.
The wonderful Sims 4 Studio people have released the latest version for Mac and it supports object recolours!! I am beyond happy right now, no more having to move between Windows and Mac. We can’t yet edit and create meshes but being able to recolour is a massive step forward. It’s still a beta version so may be a little buggy but it does support macOS High Sierra – recolour away!