View state has a limit of 135k

Best Practices to optimize your view state

• Minimize number of forms:
  Avoid using multiple form tag in VF page
  Instead of using multiple forms use <apex:actionregion> to submit portions of the form.

• Declare variables as Transient.
  if you have referred section view state in VF page you must be aware that non-transient variables are stored.
  If variable is declared as Transient it is not saved and is not transmitted

• Recreate state instead of storing
  if you can recreate the data during postback using SOQL , you must do that

• Use Custom settings or Custom objects to store the read only data

• Only Add the fields in SOQL which is required