Program lagging when it's not using all my computer's power.

[fixer.maul]

I've created a game using Scratch. The game scratches up (no pun intended) quite a bit on my computer when I play it. I looked on task manager, and at it's high point, it's only using 29% of my Cpu power, 29% of my memory, and 10% of my GPU. At first, I thought it was just that the bottleneck was on Scratch, but I tried running the EXACT same file from my brother's computer, and it ran fine, and I did benchmarks using Geekbench on my and my brother's computer, and the results showed that my Cpu was more powerful than my brother's. We even went to the trouble to switch Gpus on our computers, and my game was STILL scratchy on my computer, and on my brother's computer it was fine. Another thing I'd like to mention, is my computer has an AMD Cpu, whereas my brother has an Intel Cpu.

Any help would be greatly appreciated!

 

[fixer.maul]

I've noticed that 8 people have read this and haven't responded, is there some other information I can give that would help anyone answer this?

Thanks.

 

[fixer.maul]

One thing I'm thinking may be the case, is, (and forgive me, I don't know too much about computers) could my computer only be allocating a certain amount of CPU to Scratch? Is that something that computers will do occasionally? One more thing, my CPU has on-board graphics, could Scratch be running off that instead of my actual GPU? The rest of my computer is running off my GPU, but is it possible that Scratch might not be?