How to deal with GetAsync or SetAsync queue when saving data quickly?

This should work, It's added to a indexed table then saves when left. I've never had a problem with this. I don't believe you will need a queue but if you do you could use 60 + numPlayers × 10 link to datastore Errors and Limits: https://developer.roblox.com/articles/Datastore-Errors

local plrs = {} -- table that players get indexed into
local datastore = game:GetService('DataStoreService'):GetDataStore('PlrData')
local cansave = true

game.Players.PlayerAdded:Connect(function(plr)
    local suc,data = pcall(function ()
        return datastore:GetAsync(plr.UserId)
    end)

    if suc and data then
        plrs[plr]={['Gold']=data.Gold}--indexed table
    elseif suc then
        plrs[plr]={['Gold']=0}
    end
end)

function save(plr)
    datastore:SetAsync(plr.UserId,plrs[plr])
    cansave = true
end

game.Players.PlayerRemoving:Connect(function(plr)
    if cansave then
    cansave = false
    save(plr)
    end
end)

game:BindToClose(function() -- saves everyone's data when game closes
    for _, plr in pairs(game.Players:GetPlayers()) do
        if cansave then
        cansave = false
        save(plr)
        end
    end
end)