Puppet users - Feb 2014 - References on Puppet performance tuning and profiling

Hi all,
I'd like to collect some info about Puppet performances, more specifically 
what are the factors and the relevant "weights" involved in:
- catalog compilation times (number of resources, number of relations among 
resources, number of parameters in classes...) 
- catalog application times (usage of source argument for files, files 
recursion, number of resources... )
- report times (number of resources and events...)
- version of Puppet
- version and breed of Ruby 
- generally any info about how different components affect Puppet 
performance

Also I'm quite interested in any tool that allows profiling of performances.
At the cfgmgmtcamp the PuppetLabs guys said something about their internal 
performance testing, is there something available online?

I add some of the links I've found, any other suggestion or link is very 
welcomed:

General common suggestions:
Use Passenger instead of Mongrel
Use PuppetDB instead of Active Records based stored configs

Presentation: Puppet at Scale by Sam Kottler
http://puppetlabs.com/presentations/running-scale-practical-performance-tuning-puppet

Scaling Puppet on docs.puppetlabs (a bit too limited... are there other 
official docs on the subject?):
http://docs.puppetlabs.com/guides/scaling.html

On Ask.puppetlabs: How can I do detailed puppetmaster profiling? 
https://ask.puppetlabs.com/question/401/how-can-i-do-detailed-puppetmaster-profiling/

Blog post by Brice Figureau: Benchmarking Puppet Stacks
http://www.masterzen.fr/2012/01/08/benchmarking-puppet-stacks/

Blog post by Oliver Hookins: Puppetmaster performance tuning with 
mod_mem_cache
https://paperairoplane.net/?p=380

Tool - Puppet profiler:
https://github.com/rodjek/puppet-profiler

Usage of --evaltrace and --summarize options
From a previous thread 
here:
https://groups.google.com/forum/#!msg/puppet-users/8lhVCCpNH38/gafry4nmhMkJ
puppet agent --{summarize,test,debug,evaltrace} | perl -pe 
's/^/localtime().": "/e'

Any reply to the points at the beginning and more links are welcomed.

al

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