Why does my Nexus 5 lag?

[AC Question]

Hi guys, so I recently bought a nexus 5 I just got it like 5 days ago. My problem is that I have some lag problems. My phone lags when I play games like Dead trigger 2. I also have this game called Kritika, I don't know if you've heard of it, it's from Gamevil, and it lags pretty bad. So why is this? It's a Nexus 5, I shouldn't have problems with the Snapdragon 800 processor. I also seem to have a little stutter in fruit ninja. Is it just me or do I have a defective device. Or is there nothing wrong with it? Can someone please tell me whether I should send it back or not? Thank you.

 

[B. Diddy]

Duplicate post, see here for response: http://forums.androidcentral.com/google-nexus-5/435945-why-does-my-nexus-5-lag.html