How to change guis all at once?

This script only changes each player's gui one at a time. How do you change the text of everyone's gui all at once?

function countdown()
    local players = game.Players:GetPlayers()
    for i = 1, #players do
        players[i].Character.Humanoid.NameOcclusion = Enum.NameOcclusion.OccludeAll
        local stats = players[i].PlayerGui.fullGui.everything.gamePlay.informer
        local spawn = game.ServerStorage.WeaponSpawns:Clone()
        spawn.Parent = Workspace
        stats.Text = '3'
        wait(1)
        stats.Text = '2'
        wait(1)
        stats.Text = '1'
        wait(1)
        stats.Text = 'Begin!'
        stats.FontSize = 'Size48'
        wait(2)
        stats.Text = ''
        wait(1)
        stats.Text = 'Objective: Find a weapon. '
        stats.FontSize = 'Size36'
    end
end
countdown()