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It Depends what your rendering settings are at. IF you want a ton of eye candy, your machine isn't going to fit the bill. You should achieve more than 26+fps to get a good experience. However with only 4 gb of RAM, you are likely to run out of VAS (Virtual Address Space). Aim to get 8 gb of RAM. Your processor isn't that great either. What is your graphics card? You MUST have at least 2 gb of VRAM to perform well. If you add dense weather, you computer will slow down even more.
My specs for comparison I get 30 fps
MSI Z-87 G-41 Mobo
GTX 970 4gb VRAM
Intel I7 4770k @ 3.5ghz
16 gb RAM
Hope I helped
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