CM11 ? Kitkat yeah? Do you like using it ? And I think you don't play games on the phone so you won't care but can you play subway surfers normally ? smoothly? Download it and even look at the loading times between gb/kk and there will be a 60% difference in performance, so everyone is different - I play games, that's why the kk or jb is terrible.
You are right, I use it for phone, browse the internet, off-road navigation, play music while commuting, email, task management, calendar, messenger, etc.
I play only casual games like 7x7, Hill Climb Racing, Glass, Strata, Smash Hit, etc.
These games runs fine.
I know that this ROM is not the best for gaming, but gaming is only a small part of my smartphone usage.
GApps package for CM11 (G300): [link] (last updated 2015-01-26)
For non device specific issues, use CM bug tracker: [link]
Don't afraid to use the button if my answer was helpful.