do
    local TIME = os.clock()
    for x = 1, 1000 do
        local tbl = {}
        for i = 1, 100 do
            for j = 1, 100 do
                tbl[(i - 1) * 100 + j] = 1
            end
        end
    end
    print(os.clock() - TIME)
end

do
    local TIME = os.clock()
    for x = 1, 1000 do
        local tbl = {}
        for i = 1, 100 do
            tbl[i] = {}
        end
        for i = 1, 100 do
            for j = 1, 100 do
                tbl[i][j] = 1
            end
        end
    end
    print(os.clock() - TIME)
end