We’d need to know a bit about your computer specs to help with your lag issues, but from what I’ve seen there were a few people trying to help you out in the support section already.
Which parts of the game cause lag for you? Condo? Plaza? Games?
You mention you don’t have NVidia? That’s okay, but if you only have an Intel graphics card it’s always going to perform less than ideal.
The game is still being developed and optimized, but it will work a lot better on a dedicated GPU as it is graphically intense in certain cases.
Optimization is a long process, but each update we optimize parts of the game. Recently Plaza has been getting a lot of focus. And workshop models are being optimized to help Condo FPS.