For those who have recent app button lag in Touchwiz. Go to application manager in setting, disable talkback service and most lag will be gone. Please let me know you results, mine are positive , did improve from 2 / 3 seconds to 0.5 second (it may be required to restart your device) 
regards
mb
Props go to @2000Hugo and @dzontra11 who came up with this fix
regards
mb
Props go to @2000Hugo and @dzontra11 who came up with this fix
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