I don't like it either, I mean really, how hard is it to spell out okay or ok .... but then again everyone does that in Text messages so they are so used to it that they would do the same on a CV or something official too ...
Doubt it's a memory leak to us, because I have a really old PC and Fiesta runs just fine on it. It may be unsuported hardware, and the fact that it's an old game, you can have any kind of i7 it may not use it's full processing power or all the cores but one.
If you have a 64bit system, which you probably do since almost every new PC or Laptop is 64 bit, the location is C:\Program Files(x86)\Core Fiesta ... or something like that