Beta just updated this morning 2/13/2020. Played the game less than 12 hours ago and FPS was normal at 60.1. Opened the Beta update and FPS has not increased above 14 during gameplay. This has essentially rendered the game unplayable. I have closed and reopened the game; opened backups of my world; shutdown and restarted Windows; even turned off the computer and started it back up. None of these has helped the FPS issue. The following is the full info from my Beta version:

beta 1.15.0.51 (cli-p392, s-1418101108) Windows 10 UWP Build, NVIDIA GeForce 840M, FPS: 13.5, Server Time: 11.2, Mem: 1275, Highest Mem: 1806, Free Mem: 17409, GUI Scale: 4.0