Well, first round of results and it looks like Ubuntu 20.04.1 Desktop is about 1% slower than 18.04.2 for MLC. I have at least 250 results per system across the various apps (ParityMachine, ParityModified, EightBit) and each app seems to average roughly 6550 seconds on 20.04 versus 6475 on 18.04 on my E5-2690 v4's.