System.LimitException: Apex CPU time limit exceeded 
Stack Trace: Class.OpportunityTriggerHandler.OnAfterInsert: line 63, column 1 Trigger.OpportunityTriggers: line 30, column 1

I am getting above Error while deployment Why? 

Hi All,
           I have a List button that shown for all profiles view, I need to resitrict the button to show only for Technician Profile, How can set the accessablity to that button? like field level security.