Lag Won't Go Away

Hi, I have a computer that ALWAYS lags when I play Maple. It won't go away! I tried to allocate more ram into my C drive but that only helped a little bit. No matter how much rebooting I do, Maple still lags!

Does anyone a relatively cheap or no cost fix? It's frustating as an arch mage since I have to spam ultimates.

YES, I have used the stickies... they don't help. :x My mother's 5-years old Windows xP pc works better!