Flash and my old computer

Okay I need some help from you guys, since I know literally nothing about computers(outside gaming and surfing the net).

My internet connection is wonderful and fast, but my computer is OLD, like 2003 XP. When I play games that have heavy flash in them, I often lag bad...REALLY BAD. My computer sounds like its just going to explode and I have 1-5sec freezes every 1-10secs. Like hell, when I play from our laptop with a really SLOW internet connection, I can play those games fine, because the laptop is quite new.

So what I'm asking is that is there way to increase flash memory or w/e to make it lag less?

Okay I need some help from you guys, since I know literally nothing about computers(outside gaming and surfing the net).

My internet connection is wonderful and fast, but my computer is OLD, like 2003 XP. When I play games that have heavy flash in them, I often lag bad...REALLY BAD. My computer sounds like its just going to explode and I have 1-5sec freezes every 1-10secs. Like hell, when I play from our laptop with a really SLOW internet connection, I can play those games fine, because the laptop is quite new.

So what I'm asking is that is there way to increase flash memory or w/e to make it lag less?

It probably is just RAM but it probably has to do with just the... age of the computer. The RAM/processor/gpu are just old.