[2020] Yeah... So I think it's safe to assume the new turrets are nothing to worry about.

The auto turret rotation speed was never slowed in the last patch, in fact, we increased the rotation speed when locked onto a target.

This my testing on a vanilla server:

https://files.facepunch.com/Alistair/February/10/2k59bw383n4/TSNkSOiADl.mp4

https://files.facepunch.com/Alistair/February/10/8921IU270Fc/lAO6cse7XU.mp4

I further tested with a variety of weapons, ammo, attachments and server performance and could not reproduce the results as in the video posted.