howto/fabric.md

@@ -455,6 +455,15 @@ developers", might as well add a few key references:
  * [tags](https://docs.ansible.com/ansible/latest/playbook_guide/playbooks_tags.html) can be used to run a subset of a playbook but also skip
    certain parts
 
+Finally, Ansible is notoriously *slow*. A [relatively simple Ansible
+playbook](https://salsa.debian.org/anarcat/prometheus.debian.net) to deploy Prometheus runs in 44 seconds while a
+fully-fledged Puppet configuration of a production server runs in 20
+seconds, and this includes a collection of slow facts that takes 10 of
+those 18 seconds, actual execution is nearer to 7 seconds. The Puppet
+configuration manages 757 resources while the Ansible configuration
+manages 115 resources. And that is with [ansible-mitogen](https://packages.debian.org/unstable/ansible-mitogen): without
+that hack, the playbook takes nearly two minutes to run.
+
 In the end, the main reason we use Fabric instead of Ansible is that
 we use Puppet for high-level configuration management, and Ansible
 conflicts with that problem space, leading to higher cognitive