How to fix my drag system issue?

Help and Feedback Scripting Support
1

So, things start to twitch when I start dragging them and walking at the same time
How to fix this?
Code:

RunService.RenderStepped:Connect(function(dt)
	if curPart then
		local character = player.Character
		if not character then return end

		local humanoidRootPart = character:FindFirstChild("HumanoidRootPart")
		if not humanoidRootPart then return end

		local desiredPos
		if UIS.TouchEnabled then
			desiredPos = humanoidRootPart.Position + humanoidRootPart.CFrame.LookVector * carryDistance + Vector3.new(0, 1.5, 0)
		else
			local mouseRay = camera:ViewportPointToRay(UIS:GetMouseLocation().X, UIS:GetMouseLocation().Y)
			desiredPos = mouseRay.Origin + mouseRay.Direction * carryDistance
		end

		local bv = curPart:FindFirstChild("HoldVelocity")
		if bv then
			bv.Velocity = (desiredPos - curPart.Position) * 15
		end

		local bg = curPart:FindFirstChild("HoldGyro")
		if bg then
			bg.CFrame = CFrame.new(curPart.Position) * CFrame.Angles(0, math.rad(45), 0)
		end

		return
	end
end)