This is just baffling

I've heard many people complain about how Maple will suck every drop of RAM they have and run their CPU into the ground on the drop of a hat and basically can't be run with anything else...

But at this moment I'm playing Mabinogi, another Nexon game albeit by a different team, an actual 3D, textured, rendered game, and The Elder Scrolls V: Skyrim, simultaneously on the same machine with no problems in either and barely any CPU or RAM in use.

How on earth do you program a 2D sprite game so badly it can barely run on it's own when other games that are far more complex and detailed run just fine together?

I recall someone posting screenshots a while back showing GMS using 2 or 3 times the memory and CPU that KMS did.
I've always assumed our version was slow because it is using the bulk of your CPU doing anti-hack checks -checking and rechecking you memory or disk in case you loaded a hack or edited data in the last half second. I recall when I was trying to use a program called Process Monitor in a futile attempt to see what was causing the screen freezes every 15 seconds and it was amazing to see the huge amount of activity going on every second than seemed to have nothing to do with normal game functions.