Memory & cpu

So, I updated my RAM (from 4GB to 12GB), now, I want to increase my CPU.

I thought the whole point of RAM was to prevent my computer from lagging, but it still does!

It only happens when I'm converting a file to iTunes (Vuze Related).

Currently, my MEMORY is:
Wired: 1.02 GB
Active: 2.09 GB
Inactive: 948 MB
Free: 7.71 GB

My CPU is:
User: 95%
System: 3%
Nice: 0%
Idle: 2%

^Again, the only reason as to why my CPU is so high is because I'm converting files to iTunes. This is also causing my computer to lag, and sometimes websites (or apps) would crash because of this (i.e., my safari pages don't load, or I get the dreaded spinning beach ball!)

My question is:

How can I increase my CPU?!

I found this link:

http://www.youtube.com/watch?v=x4bEflo7Ycw

^Thats for an app called CPU Speed Accelerator, which will supposedly increase my speeds by 20-30%.

Has anyone here used this before? Do you know of any other method that will increase my CPU, whether it's purchasing or downloading something?

Also, if someone can explain to me the difference between the two, that will be very helpful too; cause at this point, I'm a bit confused.

Thanks in advance!

MK

 

Well, I said it's Vuze related.

I downloaded a movie from it, and on the left hand side, it has a DEVICE PLAYBACK section, which I set to iTunes. I basically drag and drop the download from the File section to the Device Playback section, and it automatically starts converting my movie.

Anyway, my CPU usage is super high, how can I lower it so my computer doesn't lag?