Drupal 8 : Introduction to Big Pipe

The Big Pipe is the new methodology for loading web pages. While using Big Pipe concept it will split request into multiple requests this request is sent parallel for the server. The server completes its first request from multiple, then sent the response to the browser. The Browser will not wait for all responses. Whenever it will receive a response it will render output. 

The each request have their own segment to receive a response at the browser level. The segments are replaced will appropriate response from the server. These segments are generated by Javascript. The Concept of BIG PIPE is implemented using normal PHP with Javascript. This concept was introduced by Facebook on 2009.