how to decrease lag when making fake hands?

so i am making fake hands for my fps game this is the code:

game:GetService("RunService").RenderStepped:Connect(function()
    mytool = character:FindFirstChildOfClass("Tool")
    if mytool then
        righthand:SetPrimaryPartCFrame(mytool.tool.righthand.CFrame)
        lefthand:SetPrimaryPartCFrame(mytool.tool.lefthand.CFrame)
        mytool.tool:SetPrimaryPartCFrame(camera.CFrame)
        game.ReplicatedStorage.look:FireServer(camera.CFrame.LookVector.Y)
    end
end

so in line 6 it moves the gun it works well 0 lag moves when i move but right before it one line 5 and 4 it moves the hands but the hands are laggy and when i move they move late so they go to right where they should have been 1 frame ago how do i fix this?