Preload method any other efficient way to do this?

Here is my current script for the loading gui to be added to the players player gui.

game.Players.PlayerAdded:connect(function(Player)
repeat wait() until game.ContentProvider.RequestQueueSize ~= 0
local MainMenu = game.ServerStorage.MainMenu 
local Clone = MainMenu:Clone()
Clone.Parent = Player:WaitForChild("PlayerGui")
end)

And since I have a lot of image labels I need them to be preloaded without buffering in the beginning. So I used this method but it still doesn't work well.

local ContentProvider = Game:GetService("ContentProvider")

local function LoadAssets(AssetList)
    -- Takes an asset list and preloads it. Will not wait for them to load. 

    for _, AssetId in pairs(AssetList) do
        ContentProvider:Preload("http://www.roblox.com/asset/?id=" .. AssetId)
    end
end

LoadAssets({2253543, 2434541, 5133543, 2423433, 41143243, 2453865, 21433365, 2154549})

Any help? Very appreciated