There isn't a quick fix and instant solution, you'll need to search for similar problems and read through their actions.
Search for better battery stats, bloatware and social media apps.
You might be better to factory reset and format your internal sd card after updating to 4.3, most people have a better experience afterward.
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Note: This quote doesn't automatically apply to everyone, decide for yourself if it might apply to you.
Originally Posted by justruss
What has this place become?
It's essentially a few people graciously answering the same repeating of immature, lazy, demanding questions from the masses.
Nobody searches. Nobody reads the first posts or titles of threads. Nobody even looks at posts a couple above their own.