Quote:
I THINK I have noticed slowdown.
Start using the debug panel and you'll KNOW if there is a slowdown.
You'll also have a better idea on what it causing it (scripts, polygon, memory, etc.).
Your system is a bit slow by today's standards and extremely memory limited. But you should be able to make a fun game. You don't need shaders or a highpoly count to have fun. GTA with block-people would kick-butt! 
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