What are the Best Practises for Improving Visualforce Performance ?

Hi Saurabh,

There are many factors that affect the visualforce Performance:

• Load Times

1. Avoid SOQL queries in your Apex controller getter methods.
2. Reduce the number of records displayed on a page
3. In all cases, Visualforce pages must be under 15 MB

• Multiple Concurrent Requests

1. Increase the time interval for calling Apex from your Visualforce page.
2. Move non-essential logic to an asynchronous code block using Ajax.

For more details use this link