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[Miuramir]

Would it be possible to use a utility to temporarily disable the other 3 cores on my CPU and "divert power" as it were to the one core the game will be using?

Depends on the CPU; you probably *can* do this, but whether it's actually a good idea depends strongly on the CPU technology.  Most good modern CPUs, if given primarily a single-core task, will not only allocate more power to a single core and increase it's speed, but actually slowly (by computer terms) rotate which core is "hot" to give more performance for the same cooling solution.  In other words, locking things to a single core can significantly *decrease* performance in some cases, as the cores can't "trade off" which is the hardest-worked one to rotate cooling. 

You may want to read the wiki article on Intel Turbo Boost if you're using an Intel chip made since around 2008. 

This is also why laptops aren't usually as good as desktops even with similar nominal speeds; a good desktop has cooling for running the processor at full Turbo, whereas almost all laptops (even some nominally "gamer" ones) are cooling limited such that they can't run their CPU flat-out for long without throttling back; their maximum speeds are more of a short-term boost for opening files and the like.