Default RAM & BATTERY problem cm10 20120924 nightly mb525

hi all, i'm new to this update. yesterday i install "cm10 20120924 nightly mb525"
1. my ram utilization keep on showing 85-90%
2. my battery drains from 70%- 40% within 3 hrs

MY MOBILE DETAILS:
1. rom = cm10-20120924-nightly-mb525
2. android version = 4.1.1
3. lens = green lens
4. application installed = facebook, clean master, task killer, whatsapp, outlook

Kindly solve my issue ASAP.

(sry for my english)