ESI slowing down page loading

[Pinakee BIswas]

Hi,

We are using varnish 4.1.8 and Django 1.11 for our application.

We are using ESI to break down caching on a page. Part of pages which 
are dynamically loaded are fetched from the backend server using ESI but 
if there are multiple ESI calls on a page, the server response time and 
hence, the page loading increases. This is because of the increase in 
the number of calls to the backend server before Varnish serves the page 
to the client.

Could you please let me know if there is a way to optimize the above?

Thanks,

Pinakee