Im unaware of what some stuff means, im gonna try and explain the stuff i know, it would be nice if someone would correct me if im wrong.
Instances: Objects, scripts (?) welds (?) (unsure about what counts as an instance)
Primitives: Parts specifically, includes stuff in replicated storage.
Moving prims: Moving objects
Joints: (very unsure, maybe unions?)
Contacts: Objects making contact with something?
Tree: Never seen it above 0, no idea what it is, please let me know.
Physics: physics are capped at 60 fps
Mouse move: Cursor speed.
Render: Rendering framerate
Delta bw render: No idea
Total render: amount of rendering? Seems to be higher on lower fps for some reason.
Render Nom: No idea, seems to be close to your fps if uncapped.
Frame id: Probably how many frames has been done on the client in the game?
World id: Similar to frame id? Maybe how often the game calculates something.
No idea what the stuff in throttles means.
RequestQueue: Idk, maybe stuff waiting to be loaded on the client?
I would like someone to explain it all, as it isnt documented anywhere from what i know.