Almost a year ago, BigPipe was the first experimental module added to Drupal 8. It was still experimental in Drupal 8.2 (October 2016), but it was upgraded from alpha to beta stability. Later today, Drupal 8.3.0 is going to be released, and BigPipe is now stable!
Install it!
BigPipe is a zero-risk module. So … why not install it right now? You can uninstall it at any time. It won’t cause problems in any browser, on any web server, or with any proxy. Because:
There is zero risk of data loss. And when the environment — i.e. web server or (reverse) proxy — doesn’t support streaming, then BigPipe-delivered responses behave as if BigPipe was not installed. Nothing breaks, you just go back to the same perceived performance as before.
If you’re still on Drupal 8.2 for a while — also install it! There are no functional changes for BigPipe between 8.3 and 8.2.
Stability
In hindsight, we could have made BigPipe stable from day one, or at least in Drupal 8.2.