倒数计时器在pygame屏幕上延迟？

Question

我创造了一个游戏;其中一个主要组件是倒数计时器 - 但是这个计时器被延迟了，我无法推断出原因。

这就是我设置计时器的方法：

loops = 0
minute = 1
tens = 0
ones = 0 

#Timer Calculation
    screen.blit(cloudSky, (0,0))
    if go == True:
        loops = loops + 1
        if (loops % 60)== 0:
            if ones == 0 and tens == 0 and minute != 0:
                tens = 6
                ones = 0
                minute = minute - 1

            if ones == 0 and tens != 0:
                ones = 9
                tens = tens - 1

            elif ones != 0:
                ones = ones - 1

            elif tens == 0 and ones == 0:
                tens = 5
                minute = minute - 1

            elif ones == 0 and tens != 0:
                tens = tens - 1


            if minute <= 0 and tens == 0 and ones == 0:
                go = False

#Draw Clock Time
time = timeFont.render(str (minute)+ ":" + str (tens) + str (ones), True, WHITE)
screen.blit(time, (750,10))

非常感谢任何帮助！