How to implement deltaTime to decrease choppiness?

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1

Hi guys, I have a camera script that works fine, but it lags really bad at lower frame rates. How can I use deltaTime to stop the choppiness?

local RunService = game:GetService("RunService")
local car = script.Parent.Car.Value
local cam = workspace.CurrentCamera

-- if offset is too far on one side, change the offset value
-- -1.5 for right hand drive and 1.5 for left hand drive

cam.CameraType = "Scriptable"
cam.FieldOfView = 50

RunService:BindToRenderStep("CustomCam", Enum.RenderPriority.Camera.Value + 1, function(deltaTime)
	local carSpeed = car.DriveSeat.Velocity.Magnitude
	
	local smoothness = 1000 / (carSpeed / 10)
	
	local pos = car.DriveSeat.CFrame * CFrame.new(1.5, 6, 24) * CFrame.Angles(-math.rad(8), 0, 0)
	cam.CFrame = cam.CFrame:Lerp(pos, 0.25)
	
	if carSpeed > 85 then
		cam.CFrame = cam.CFrame * CFrame.new(math.random(-1, 1) / smoothness, math.random(-1, 1) / smoothness, math.random(-1, 1) / smoothness)
	end
end)