Renting beefier servers may also be an option if the performance impact scales linearly with pre-patch performance. However it's not clear in this case how that works.
Depends if the bottleneck is a single CPU or whether it is a single machine. Those beefier machines are usually slower per CPU.
I've seen some crazy game server designs before in the quest to have fast response times. But UE4 is pretty professional so even if they are tied to a single machine, they probably are not tied to a single core for some of their critical algorithms I would hope.
I've seen some crazy game server designs before in the quest to have fast response times. But UE4 is pretty professional so even if they are tied to a single machine, they probably are not tied to a single core for some of their critical algorithms I would hope.