Why does part lag when player changed direction

[nizypizy2000]

when the player move forward, the part moves smoothly but when the player turns around, it starts lagging during the turn

game file: Tilt-UI new.rbxl (51.6 KB)

the main script is in starter gui and here is script:

note: you dont need to download file, just copy this script and put it in a local script and put the script in startergui

local RunService = game:GetService("RunService")
local Players = game:GetService("Players")

local player = Players.LocalPlayer

local TweenService = game:GetService("TweenService")

local function create3DInterface()
	-- Wait for the player's character to load
	local character = player.Character or player.CharacterAdded:Wait()
	local humanoidRootPart = character:WaitForChild("HumanoidRootPart")

	-- Check if "stats" or "interface" parts already exist
	if character:FindFirstChild("stats") or character:FindFirstChild("interface") then
		warn("3D interface parts already exist. Skipping creation.")
		return
	end

	-- Create the stats part
	local statsPart = Instance.new("Part")
	statsPart.Size = Vector3.new(7.54, 6.777, 0.49)
	statsPart.Anchored = true
	statsPart.CanCollide = false
	statsPart.BrickColor = BrickColor.new("Bright blue")
	statsPart.Transparency = 0.4
	statsPart.Name = "stats"
	statsPart.Parent = game.Workspace

	-- Create the interface part
	local interfacePart = Instance.new("Part")
	interfacePart.Size = Vector3.new(5.766, 4.569, 0.49)
	interfacePart.Anchored = true
	interfacePart.CanCollide = false
	interfacePart.BrickColor = BrickColor.new("Really red")
	interfacePart.Transparency = 0.4
	interfacePart.Name = "interface"
	interfacePart.Parent = game.Workspace


	-- Offset for interface part
	local interfaceOffset = CFrame.new(0, 0.6, -2.5) * CFrame.Angles(0, math.rad(180), 0)
	local statsOffset = CFrame.new(0, -2, -0.5) * CFrame.Angles(math.rad(110), 0, math.rad(180))
	-- Shaking effect for both parts
	local shakeAmplitude = 0.1
	local shakeSpeed = 2
	local RunService = game:GetService("RunService")

	local connection
	connection = RunService.RenderStepped:Connect(function(deltaTime)
		if humanoidRootPart and humanoidRootPart.Parent then
			local time = tick() * shakeSpeed
			local shakeX = math.sin(time) * shakeAmplitude
			local shakeY = math.cos(time) * shakeAmplitude
			local shakingOffset = CFrame.new(shakeX, shakeY, 0)

			-- Directly update the parts to match HumanoidRootPart
			statsPart.CFrame = humanoidRootPart.CFrame * statsOffset * shakingOffset
			interfacePart.CFrame = humanoidRootPart.CFrame * interfaceOffset * shakingOffset
		else
			connection:Disconnect()
		end
	end)
end

create3DInterface()

[happya_x (Happya)]

the problem is that the runservice connection isnt updating at the right times

try using

RunService:BindToRenderStep("whatever name", Enum.RenderPriority.Camera.Value - 1, function(deltaTime)

if that doesnt work then maybe use a weld or spring

edit: also try Enum.RenderPriority.Character since the thing is bound to the character

[nizypizy2000]

@happya_x

RunService:BindToRenderStep("whatever name", Enum.RenderPriority.Camera.Value - 1, function(deltaTime)

where do i put this part though???

[happya_x (Happya)]

@nizypizy2000

connection = RunService.RenderStepped:Connect(function(deltaTime)

replace the runservice connection you already have

[nizypizy2000]

it doesnt work for some reason idk why

[StonksMcHat]

It has to do with the order of render/physics.

RenderStepped, Stepped, or Heartbeat

Each of these run once a frame, but they run at different times during the frame. Here’s a helpful diagram to show this, made by zeuxcg and prettified by Fractality_alt: [image] Examples for when you’d use each: RenderStepped runs before anything renders, so stuff like camera manipulation that’s used to display immediate feedback for the player should be put here. It also blocks rendering until the connected function is done, so don’t put anything too slow in here. Stepped runs before th…

Try use Heartbeat instead, it should fix it.

[nizypizy2000]

i tried it but it does not work. it still lags when turned

[StonksMcHat]

I knew I had fixed this before!
The issue is that the hrp doesnt rotate every renderstepped, only per heartbeat and those two are unsynced.

Solve it by setting the HRP cframe every renderstepped

local look = workspace.CurrentCamera.CFrame.lookVector
humanoidRootPart.CFrame = CFrame.new(Vector3.new(0,0,0), Vector3.new(look.x, 0, look.z)) + humanoidRootPart.Position
			
-- Directly update the parts to match HumanoidRootPart
statsPart.CFrame = humanoidRootPart.CFrame * statsOffset * shakingOffset
interfacePart.CFrame = humanoidRootPart.CFrame * interfaceOffset * shakingOffset

[nizypizy2000]

THANKS SO MUCH! I spent a long time trying to fix this and it works!

thanks to all the people who helped in this post