python里面turtle.tracer的问题

中间有一段时间卡顿，最后图片会显示完整，但是不知道怎么修改
问题来源是turtle.tracer(0)这个代码的问题

#圣诞树
import turtle as t
import random,time,datetime,math

t.hideturtle()
t.setup(1000,600,100,0)
t.tracer(0)

def bg(size):
    t.colormode(255)
    a=random.randint(30,70)
    b=random.randint(10,25)
    c=random.randint(10,25)
    t.bgcolor(a,b,c)
    t.pendown()
    t.color("yellow","yellow")
    t.begin_fill()
    for i in range (5):
        t.forward(size)
        t.right(144)
    t.end_fill()

def koch(size,n):
    if n==0:
        t.fd(size)
    else:
        for angle in [0,60,-120,60]:
            t.left(angle)
            koch(size/3, n-1)

def main(size):
    t.pendown()
    t.color("white","white")
    t.begin_fill()
    level=2
    koch(size,level)
    t.right(120)
    koch(size,level)
    t.right(120)
    koch(size,level)
    t.end_fill()

def xuedi1():
    t.penup()
    t.goto(-530,-260)
    t.pendown()
    t.pensize(87)
    t.color("white")
    t.goto(530,-260)
    t.pensize(5)
    t.goto(530,-220)
    t.left(90)

def xuedi2():
    t.circle(random.randint(0,6),180)
    t.right(180)


for i in range (75):
    t.penup()
    t.goto(random.randint(-485,485),random.randint(-100,290))
    bg(10)
    t.penup()
    t.goto(random.randint(-485,485),random.randint(-290,290))
    main(10)
    t.penup()
    t.goto(random.randint(-485,485),random.randint(-290,290))
    main(10)
    time.sleep(0.025)
xuedi1()
for i in range(200):
    xuedi2()
    time.sleep(0.025)


def wjx():
    t.penup()
    t.goto(225,250)
    t.pendown()
    t.pensize(25)
    t.color("yellow","pink")
    t.begin_fill()
    for i in range (5):
        t.forward(50)
        t.right(144)
    t.end_fill()

def sdssg(angle):
    t.penup()
    t.goto(250,250)
    t.colormode(255)
    a=random.randint(90,100)
    b=random.randint(100,150)
    c=random.randint(30,80)
    t.color(a,b,c)
    t.begin_fill()
    t.pendown()
    for i in range(6):
        t.setheading(0)
        t.right(90+angle)
        t.forward(80)
        t.left(90+angle)
        t.forward(20)
    t.penup()
    t.goto(250,250)
    t.pendown()
    for i in range(6):
        t.setheading(0)
        t.right(90-angle)
        t.forward(80)
        t.left(90-angle)
        t.forward(-20)
    x=angle
    long=240-960*(math.sin(math.radians(x)))
    t.forward(long)
    t.end_fill()

for i in range (4):
    sdssg(35-5*i)
    time.sleep(0.5)
wjx()
def write():
    t.penup()
    t.goto(-400,200)
    t.pendown()
    t.pencolor("white")
    t.write("Happy",font=("arial",66,"normal"))

    t.penup()
    t.goto(-350,100)
    t.pendown()
    t.pencolor("yellow")
    t.write("Christmas",font=("arial",66,"normal"))
write()
t.done()

运行结果及报错内容

我的解答思路和尝试过的方法

怎样可以使前面的画图加快，后面的慢下来，又不会中间卡顿，这个是中间一段代码出现的问题

修改完毕,如果有可能的话少用点sleep(),他会阻塞进程

import turtle as t
import random,time,datetime,math
t.setup(1000,600)
t.hideturtle()

t.tracer(0)


def bg(size):
    t.colormode(255)
    a = random.randint(30,70)
    b = random.randint(10,25)
    c = random.randint(10,25)
    t.bgcolor(a,b,c)
    t.pendown()
    t.color("yellow","yellow")
    t.begin_fill()
    for i in range(5):
        t.forward(size)
        t.right(144)
    t.end_fill()


def koch(size,n):
    if n == 0:
        t.fd(size)
    else:
        for angle in [0,60,-120,60]:
            t.left(angle)
            koch(size / 3,n - 1)


def main(size):
    t.pendown()
    t.color("white","white")
    t.begin_fill()
    level = 2
    koch(size,level)
    t.right(120)
    koch(size,level)
    t.right(120)
    koch(size,level)
    t.end_fill()


def xuedi1():
    t.penup()
    t.goto(-530,-260)
    t.pendown()
    t.pensize(87)
    t.color("white")
    t.goto(530,-260)
    t.pensize(5)
    t.goto(530,-220)
    t.left(90)


def xuedi2():
    t.circle(random.randint(0,6),180)
    t.right(180)


for i in range(75):
    t.penup()
    t.goto(random.randint(-485,485),random.randint(-100,290))
    bg(10)
    t.penup()
    t.goto(random.randint(-485,485),random.randint(-290,290))
    main(10)
    t.penup()
    t.goto(random.randint(-485,485),random.randint(-290,290))
    main(10)
    time.sleep(0.025)
xuedi1()
for i in range(200):
    xuedi2()


def wjx():
    t.penup()
    t.goto(225,250)
    t.pendown()
    t.pensize(25)
    t.color("yellow","pink")
    t.begin_fill()
    for i in range(5):
        t.forward(50)
        t.right(144)
    t.end_fill()


def sdssg(angle):
    t.penup()
    t.goto(250,250)
    t.colormode(255)
    a = random.randint(90,100)
    b = random.randint(100,150)
    c = random.randint(30,80)
    t.color(a,b,c)
    t.begin_fill()
    t.pendown()
    for i in range(6):
        t.setheading(0)
        t.right(90 + angle)
        t.forward(80)
        t.left(90 + angle)
        t.forward(20)
    t.penup()
    t.goto(250,250)
    t.pendown()
    for i in range(6):
        t.setheading(0)
        t.right(90 - angle)
        t.forward(80)
        t.left(90 - angle)
        t.forward(-20)
    x = angle
    long = 240 - 960 * (math.sin(math.radians(x)))
    t.forward(long)
    t.end_fill()


for i in range(4):
    sdssg(35 - 5 * i)
wjx()


def write():
    t.penup()
    t.goto(-400,200)
    t.pendown()
    t.pencolor("white")
    t.write("Happy",font = ("arial",66,"normal"))
    t.penup()
    t.goto(-350,100)
    t.pendown()
    t.pencolor("yellow")
    t.write("Christmas",font = ("arial",66,"normal"))


write()
t.done()

在range(75)循环体的最后加一句 t.tracer(10,0)

turtle.tracer(0) 关掉踪迹，但以用turtle.speed(speed) 用来控制绘制的速度的，speed范围是010，设置成110速度依次加快，但speed=0才是最快的。也可用指定的字串表示：'fastest' == 0; 'fast' == 10; 'normal' == 6; 'slow' == 3; 'slowest' == 1。