Like people all over the world MoreComputers.com have been affected by the recent Android 4.3 Update For Samsung Galaxy S3. After a lot of trial and error we've hit on a part fix and wanted to share it.
We've just disabled the Smart Stay and Smart Rotation Options - the performance is MUCH better and the lag is greatly reduced.
On your Samsung Galaxy S3 go to Settings > MyDevice (2nd option from the bottom) and disable these features.
Hope that helps you.
We've had some feedback from other S3 owners who understandably are trying anything to get their phones working. Here are their suggestions (We'll add to the list as and when we get new tips): Please post any successes or tips in the comments.
Switching lock screen off altogether seems to help
Disabling the 2X Battery app improved the lag noticeably
Disabling accuweather auto update
Disabling in Settings as many of the Samsung apps as possible improves performance by decreasing the memory footprint. It does look like these issues are mainly to do with memory management - the less free memory, the worse the problems.
Disable bloatware - people have found this article useful: apps safe to remove
Solves lock screen, gallery and music problems install the Kitkat home launcher
Go back to the previous version of Android How to downgrade Galaxy S3 back to Android 4.1.2: tutorial