Yes it is 3rd party software and you can't monitor and load balance processes manually in 3 clicks let alone as efficiently and effectively as a program.
To come close to an equivalent, you'd have constantly look at the task manager to see which processes are requesting allocations. Anyway, I don't think you understand load balancing. Read the subject.
Yes you "can" change priority in task manager which gives you a warning that doing so could cause system instability, but this program will not only manage it safely, it will give you better results.
oh and self-proclaimed PC experts can...(insert action of choice here)
TMPC