I've updated Unity to 5.4.

Due to the large amount of different colored furniture the game has to render I developed a solution some months ago, where I combine all furniture into one big object for the graphics card to render all at once. This trades in memory for performance. However, the game has been crashing for some people because the GPU would run out of memory.
Unity 5.4 introduces GPU instancing, which allows me to draw each type of furniture all at once, no matter their color. This might slow performance as all furniture is no longer being drawn at once. If you have a lot of varied furniture from mods, this will be slower, but on the other hand, if you have a lot of similar furniture, like many tables and computers, these will be rendered very quickly. I've traded some performance for stability, but overall the game should still perform a lot better compared to last year.

Note that GPU instancing only works for DirectX11+ and OpenGL 4.1+, if your computer is very old or hasn't been updated for a long time the game might see a big performance hit with a lot of furniture present on screen at once. If your computer is that old it would probably crash out of memory at that point anyway, though.

Since new versions of Unity can prove quite unstable, I'm keeping this in testing for a while to see if the game suddenly stops working for some configurations.

Fixes

• Road visible from basement after loading game
  

• Switch to GPU instancing for furniture
  
• Switch to GPU instancing for cars
  
• Switch to GPU instancing for roads