Low FPS in games

Hello, I have a Dell Inspiron Laptop with an intel core i3 processor. I play a few online games but my fps is always really low. I'm on the lower settings and I need help on increasing it. I am usually alright with computers but this one is hard to figure out for me. If anyone could help, I would be delighted. Thank you.
 
The i3 is pretty weak for gaming, but you can increase the memory to max allowed and make sure that the C drive is not too full
 
I noticed I had not shut down my laptop in a while and the RAM had become almost full. Restarted and now I have over 100 fps! Thank you though Tmagic650!
 
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