I was trying to link a parallax actor to the X and Y of the camera local but as I've come to realize having code linked to the camera gets you something that looks like the gif below. I was able to get the player to keep with the camera so this has nothing to do with the actor itself but how the camera is coded or the relation actors have with the camera. I found that putting the code for the camera last after the physics code works out fine. Actors the camera depends on or actors the actor the camera is coded with (dummy actor) also don't jitter but as soon an actor is dependent on the code of the camera or dummy actor then that actor jitters.
This strange jittering has been discussed before in the forums but no clear instruction on how to prevent it has been given. It's been attributed to physics many times but I can affirm this just isn't the case most of the time. This image is from gamemaker so this isn't an isolated problem. I'd recommend at least skimming the linked article.
The code for the parallax actor is also below. It would work as intended if it weren't for this jittering.
