Camera movement usually remains real time regardless of tick rate.
This changes when you're mounted however. You still retain real time control of your view vertically, but your horizontal inputs are processed weirdly.

Steps to reproduce

• Get in a minecart
• Set tick rate to 1
• Try to look around

Observed results

• You cannot freely look around as you would normally
  Minecraft 2024.11.29 - 22.10.10.04.mp4

Expected results

• Being in a mount wouldn't change how the camera works