what is the "farm"?
I think he's talking about OpenToonz's 'render farm'.
Basically, we can cue up any number of projects to render via Batches.
If you look on the Batches tab you'll see an option to Add Render.
Add as many renders to the list as necessary and then set them to rendering.
They'll work according to the options you set.
There are basically two types of tasks we can set in the Batches 'farm'; rendering and cleanup.
We can even save these tasks out as lists for later loading and execution.
Perphaps best of all, these lists are text files so they can be edited outside of OpenToonz so that a lot of tasks can be launched with very little changes to the list.
Care should be taken of course to make sure the formatting of the list is maintained so unless you know what you are doing there it is best to have OpenToonz make that list.
A slightly more simple means of speeding up renderings without using Batches/Task Listings would be to go into Render Settings and make sure that the setting under File Settings for Dedicated CPUs is set to All. I believe this is the default so you should have that already set.
If none of that relates to what 'farm' is then.... please disregard. ;)