We noticed that the current default settings perform very poorly under
load. We managed to literally take down Greenlight during a larger event
when people where accessing the landing page for rooms and when doing
some tests, I was more or less able to DoS Greenlight on my own.
This patch adds a default worker configuration which significantly
improves the situation. The small, 4 core machine I was testing on could
handle about thrice the amount of requests.
While the new default configuration should be reasonably well suited for
most deployments, this patch further allows users to easily configure
the worker pool on their own in the environment file.