If your Mojolicious code makes very heavy use of JSON, you might want to try out a binary drop-in replacement for the pure-perl module Mojo::JSON when you come to the optimisation stages of your project. Thanks to Marc Lehmann and Reini Urban we can use Cpanel::JSON::XS which is a fork of JSON::XS (implemented in C) with public bug tracking. Sebastian Riedel has provided (1, 2) the patch-in code for swapping-in the XS code, and I have simply bundled that up into this module.
Nic Sandfield