It was fixed with the recent patch and the game runs AMAZINGLY now! So fast!
mrknowitall526 EA_Cade did, here:
AMD GPU's still struggle to run the game in community lots | EA Forums - 11892097
The problem is that there are about a dozen threads covering this same issue, not all of which specify AMD GPUs in the thread titles or make it clear exactly when the problem happens.
From what I've gathered on steam and the forums, it's any AMD card anything that uses a driver from AMD, and everyone has also made it very clear it happens when there are more than 1 sim at a lot, or most noticeably the issue happens on a community lot, I've seen a lot of people saying the exact same thing in the forums, it's not hard to replicate at all if you use graphics from AMD and enter a community lot.
Thankfully as your post has said the CM has passed along that the team are aware of this issue and I doubt it'd be that hard to replicate giving the information everyone has passed along, it's not a very hard thing to replicate at all-
