It's because PS4 is right now locked to max out at 60hz and COD Ghosts is frequently going above 60fps which is causing the shuddering and what seems like frame rate drops. So basically IW needs to lock the frames at 60fps so they stop going over the needed amount and that would cause the shuddering also known as "frame rate drops". Even when you experience frame rate drops they don't last long and really aren't that noticeable on here. At worst the game might drop to 40fps is someone is running 2 choppers, a couple of care package choppers come inbound, a Trinity rocket, and everyone on the map shooting at the same time. It would really take a lot for the engine to get stressed and have frame rate drops. So like I said IW needs to simply lock the fps at 60 max and the game would stop doing this.
Framerate issues were apparent on the PS4 upon release date (even in pre-release it was noticed and talked about). However, the 1.62 firmware update which was supposed to address several stability issues seems to have done the opposite. In my experience on 2 different PS4s, since the 1.62 update, the framerate drops on the PS4 with Ghosts has increased about 10 fold. It used to be a generally rare occurrence, but I am seeing the drops several times a game and in some, it makes the match nearly unplayable. They went backwards with the latest PS firmware.
Oh, I agree. Whatever IW does and whatever Sony does isn't matching up and thus we have the framerate drops. The 1.62 update just made whatever IW has wrong, worse. I was just commenting about how the 1.62 update impacted the performance of Ghosts - the 1.62 update was a backwards move for that in itself - not necessarily for all of PS4.