Update call is taking time after constructor call in custom visual

Hello All,

We are facing the below mentioned issues in our custom visual:

1.   After the constuctor method, update method isn't getting called spontaneously. It is taking approximately 3 seconds for getting called.

• Warnings: Violation warnings are being prompted and it is taking time to load:

• Load Handler: Load handler is taking around 3 seconds and setTimeout handler is taking around 2 seconds

• Please find the code for constructor and update method

• Please suggest how can we reduce the update call time & how can we remove/reduce the time gap between Constructor & update method. 

2. Update Method: The update method is getting called twice

• In the first call, 'dataView' values are being returned as undefined:
• The second call is automatic and doesn't require any intervention. In the second call, the 'dataView' values returned would not be undefined.