Hello there..
I need to know is there any s3 users who can solve my problem..
my fon keep lagging after i download jelly bean..is that normal?
example: when i open my contact it takes 7-8 secs to open contact..
hel me please: is there any ways or sumthin i need to delete from my fon?

There is a problem with the contacts and dialler in Jelly Bean. it is widely known about and Samsung know about it but haven't as yet released a solution or indeed verified that it actually is a bug.
There is a thread over on xda that discusses it
http://forum.xda-developers.com/showthread.php?t=1958171 general consensus seems to be to install a 3rd party dialler, I tried, it helped a little bit but the delay/lag was still there. I've just got used to it for now. and hoping it gets better with update releases.
I never had the issue with ICS, so this is definitely a JB problem.