Improve the real or perceived speed of the site, or monitor performance metrics.
ArangoDB is multi-model database, and as such it can be used as a key-value store.
Apache Kafka is an open-source stream-processing software platform developed by the Apache Software Foundation, written in Scala and Java.
Big pipe is new since drupal 8 and introduces a way to load and render blocks which have a high cache invalidation, or are uncacheable, during the stream of the response.
This module stores optimized css/js assets in the database, and if missing from disk upon request, restores them back.