I installed the bridge and provided as the readme specified all the config options. Upon startup it started spamming requests at my matrix instance all of which were failing. After some tinkering I got it to relay about 70% of the messages from discord to my matrix instance and about 80% of my messages to discord. The server in question was not overloaded but idling at a load of around 3 (8 cores total).
The "common denominator" functionality is a joke that establishes on the minimum I would consider functional for a chat client, not what either Matrix or Discord could offer.