I use an old laptop with basicly the same specs, in video options turn off enhancment options, if you can afford it buy some ram as this will greatly boost system performance. Also make sure you have no other background programs running, as that will drain system performance as well.
If your having performance problems with a stock install, supermods and enviornment mods would probably worsen that problem and would be best avoided as they add so much to the game that they tend to drain performance even further.
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