Process History delay Opening at Operator Station

Dear Expert,

I am facing issue Process history delay opening at Operator workstation in DeltaV  13.3.6 (R6), normally it is opening in 2 second at ES, same process history is taking time 15-20 second in Operator station. 

Workstation configuration with license :-  

  1. Continuous history:- APS 
  2. Alarms and Event:-  APS 

I need to close this issue, kindly request,  suggest and share expert best solution, so that i will close point.