have a Samsung S3 that is quite slow nowdays and i cant even put basic apps like fb, skype , viber etc as they hog too much ram etc and make phone laggy. i cant afford a new phone till 2-3 months atleast .Someone suggested rooting it as touchwiz takes up lot of ram etc. Is the suggestion good ? if yes which is the fastest and stable ROM to use. by what percentage speed can improve by rooting ? atleast 20% ???