@jacobclayman About how long is "very delayed"? On an unrelated to the issue note, I'm not sure I'd recommend an InterpolationBackTime of 0 because it'll probably be extrapolating a lot but it may work for your scenario. I've had many weird things happen in editor, try two executables to be certain it still happens. If it's randomly waiting like a half second or more every now and then: I'm not sure what could be causing the issue. Definitely not normal. My best guess is maybe you are overloading the network? But your RPCs are instant so maybe not. Maybe it's just the Photon Serializer thing that's getting overloaded? I'd check out trying to send less things and see if that fixes it. About how many objects are you trying to sync and what's your Photon send rate and Photon serialization rate? Also, try turning the InterpolationBackTime to like .1s just for testing and see if you get the issue, it may be an issue with it thinking received states are already too far in the past.