Make application use CPU more than 50%

Are you on a dual or quad core CPU ? -- many older programs are not designed to run on more than a single or 2 cores which is why it will only use 50% of your CPU for that program ( in order to increase the usage it would require the program you are using to be rewritten completely in order to be more multi thread capable so short of finding a newer program to use that was designed to use multiple cores there is not much that can be done other than Overclocking the CPU so that it is running the cores that are in use faster thus getting more done every second as it processes more cycles per second.