Z3 Performance degrades even for basic apps topic

I had Z1 prior to Z3 and performance degraded overtime, not because the number of apps because that hasn't changed, but after multiple software updates. I haven't had any updates on my TMO Z3 yet, but I already feel like it's getting slower, even though I am not running any heavy apps on it. It just feels sluggish when doing basic things like launching standard Phone or Sms apps. Oh, and I am not running Stamina mode either.