SQL timeout expired

ISSUE

we are facing very slow performance when opening records of Work Order "incident" from the custom Azure-hosted portal "elarabyascportal" and we found error on crm please find below : 

Server stack trace: 
at System.ServiceModel.Channels.ServiceChannel.HandleReply(ProxyOperationRuntime operation, ProxyRpc& rpc)
at System.ServiceModel.Channels.ServiceChannel.Call(String action, Boolean oneway, ProxyOperationRuntime operation, Object[] ins, Object[] outs, TimeSpan timeout)
at System.ServiceModel.Channels.ServiceChannelProxy.InvokeService(IMethodCallMessage methodCall, ProxyOperationRuntime operation)
at System.ServiceModel.Channels.ServiceChannelProxy.Invoke(IMessage message)

Exception rethrown at [0]: 
at Linkdev.AlAraby.CRM.Logging.Logger.LogException(Exception eGlobalErr, PriorityLevel priorityLevel, String inputFriendlyMessage, IOrganizationService service)