I was playing Universe Sandbox 2 at a nice 80fps but when I spawned a supernova and see the supernova approaches me the frame rate drops to 25fps..! Here's the spec of my computer:
OS : Windows 7 32-bit
RAM : 4 GB
Processor : Pentium dual core 2.6ghz
Memory : 29.1 GB available
Graphic : DirectX10.1
Video memory : 495 MB