Multiplayer but IT'S NOT CONNECTION LAG, I have 12 ping...
APB Reloaded is coded as smooth as butter with gravel in it. Stuttering is a fact of life there with a weaker gaming cpu like yours.
Combat arms doesn't like fx processors, I believe it has something to do with Black Cypher running in the background.
1. open task manager, click show processes from all users.
2. right click black cypher set priority to low.
3. right click it again, click affinity, and uncheck all cores except 1. That is make it run on only 1 core.
4. You will need to do this every time you run the game.
And finally you need to overclock your CPU, at stock the FX's are weak.