Alternative to CASE Statement for the below mentioned code

case when AR=1 then ' Calling' when AR=2 then 'Closed' when AR=3 then 'Completed' when AR=5 then 'Resend to A' when AR=6 then 'Resend to C' when AR=7 then 'At ACompleted' when AR=8 then 'S Completed' when AR=9 then 'Re Completed' when AR=11 then 'ReA Audit Completed' when AR=12 then 'ReC Completed' when AR=13 then 'Calli Completed' when AR=14 then 'A Completed' when AR=15 then 'A Completed'End,"SubProcess"=case when SubProcess is null then '' when SubProcess=1 then 'D'when SubProcess=2 then 'U'when SubProcess=3 then 'C'when SubProcess=4 then 'M'when SubProcess=5 then 'Me'when SubProcess=6 then 'Rej'when SubProcess=7 then 'App'when SubProcess=8 then 'AR'end Looking for some better code on performance prespective