Updated:
21w08b: 266 fps (at 1280 x 720, FULL SCREEN ON)
21w11a: 91 fps (at 1280 x 720, FULL SCREEN ON)
OS: MacOS Sierra 10.12.6
CPU: Intel Core i7-3770 @ 3.4 GHz
GPU: Nvidia GeForce GTX 680MX 2GB
On a side note, I tested a new test world (1280 x 720) on the latest snapshot (21w11a) and getting around 50 fps when running around, the FPS drops (around 44-50) when getting into a biome like the Tiaga biome, but when near the beach or plains biome the FPS increases (average 60).
In the latest 21w10a, my FPS dropped on average to below 30 while moving, and when stationary it hovers between 45-59 FPS. Not sure if its my graphic card, I'm on a late 2012 iMac with GeForce GT 680.
Metrics report from 21w11a