Move camera at a constant speed specified in code

So, last time I made a forum post on how to move the camera with a joystick. My best recommendation was interpolation with Minecraft's renderPartialTicks. However, I seem to find an issue where it would randomly make it move faster or slower or just stop completely, though it did accomplish my task even if inefficient. My goal is to make the camera move at a constant speed, non-dependent on the fps while also making it render smoothly. I'm pretty sure Fortnite has done this, allowing players to move the camera at a constant speed (smoother with more fps obviously) How can I do this or achieve something similar.

My code: (currently it is frame-bound in the code)

https://github.com/Fernthedev/controller-remap/blob/5de2c0a5085f0defadf3fc7a3361d9ec83411fc0/mod-core/src/main/java/com/github/fernthedev/controllerremapmod/core/ControllerHandler.java#L380-L42