Playing the new season game after the upgrade to Big Sur, the performance of Class has been very bad. The movement of Class is slow and not smooth, which means, I think, the processor of iMac does not well process the movement. So the Class movement is slowed in seconds. I feel dizzy watching on the screen during the game.
For example, Necromancer blew a corp, then it does not happen for nearly 10 seconds…but monsters around Necromancer are moving. Necromancer can run or jump but it cannot perform constantly well. Its movement is slow and delayed in seconds compared to the mouth click.