-Loading Screen By: Tamasdzt
script.Parent:RemoveDefaultLoadingScreen()

Workspace Script
game.Players.PlayerAdded:connect(function(player)
 local gui = game.ReplicatedStorage:WaitForChild("GUI Name Here"):Clone()
 gui.Parent = player.PlayerGui
 gui.Script.Disabled = false

ScreenGui Script
local contentprovider = game.ContentProvider

while wait() do
 if contentprovider.RequestQueueSize == 0 then
  script.Parent.Frame:TweenPosition(UDim2.new(0, 0, -1, 0),"In","Quart")
  wait(1)
  script.Parent:Destroy()
 end
end