The deltas recieved from inputchanged events are lagging behind due to performance degradation. The delta’s become too big and inconsistent which causes stutter. I also created a seperate testplace to check my flight script with almost no meshes and it still happens.
I tracked the problem down to CameraInput of Playermodule. I know this because I wrote my own camera script with UserInputService:GetMouseDelta() *0.01 and it worked with little to no stutter, but when I plugged in the inputs from CameraInput.getRotation() from the Playermodule’s CameraInputs the camera started stuttering. I modified the getRotation function to match the output of UserInputService:GetMouseDelta() *0.01 to see if any differences occur.
local ROTATION_SPEED_MOUSE = Vector2.new(0.01, 0.01) -- (rad/inputdelta)
local ROTATION_SPEED_POINTERACTION = Vector2.new(1, 0.77)*math.rad(7) -- (rad/inputdelta)
local ROTATION_SPEED_TOUCH = Vector2.new(0.01, 0.01) -- (rad/inputdelta)
function CameraInput.getRotation(dt, disableKeyboardRotation: boolean?): Vector2
local inversionVector = Vector2.new(1, UserGameSettings:GetCameraYInvertValue())
-- keyboard input is non-coalesced, so must account for time delta
local kKeyboard = Vector2.new(keyboardState.Right - keyboardState.Left, 0) * dt
local kGamepad = gamepadState.Thumbstick2 * UserGameSettings.GamepadCameraSensitivity * dt
local kMouse = mouseState.Movement
local kPointerAction = mouseState.Pan
local kTouch = touchState.Move
if disableKeyboardRotation then
kKeyboard = Vector2.new()
end
local result =
kKeyboard*ROTATION_SPEED_KEYS +
kGamepad*ROTATION_SPEED_GAMEPAD +
kMouse*ROTATION_SPEED_MOUSE +
kPointerAction*ROTATION_SPEED_POINTERACTION +
kTouch*ROTATION_SPEED_TOUCH
local inputMouse = UserInputService:GetMouseDelta() *0.01
local data = result*inversionVector
if data.Magnitude > 0 and inputMouse.Magnitude > 0 then
if data.X ~= inputMouse.X or data.Y ~= inputMouse.Y then
print(data,inputMouse)
end
end
return result*inversionVector
end
if #unsunkTouches == 1 then
if touches[input] == false then
local delta = input.Delta
touchState.Move = Vector2.new(delta.X, delta.Y) -- changed += to =
end
end
The inconsistent outputs of UserInputService.InputChanged:Connect(inputChanged) is much higher then UserInputService:GetMouseDelta() *0.01.
When changing the return value of CameraInput.getRotation() to UserInputService:GetMouseDelta() *0.01 the stutters went away.
The microprofiler reveals strange spikes happening which is not from my scripts. I think thee spikes cause performance degradation and lag UserInputService.InputChanged:Connect(inputChanged)
My understanding is that when performance degrades, inputchanged takes too long to send an output which causes stutters due to high deltas. This isn’t something I can fix. It must be a core engine issue. I also closed off any particles in the game and it still didn’t help. Changing the flight script also didn’t help. I also set the networkownership of baseparts to character and it still didn’t help. My custom camera has a smoothing Vector3 point lerping to the predicted offset of the player and it also stuttered with the inputs from CameraInput module. Hopefully this is enough to detect and solve the issue. Good luck!
Expected behavior
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