[Python] Python Turtle Speed

My friend and I are working on a Python Game using turtles. Our issue is in the section where it defines the turtles. We are trying to speed each turtle up, but when we do, the default speed runs. Why is this issue occurring?

import turtle


turtle.setup(1000,1000)
wn=turtle.Screen()
wn.title("Snake Game!")

#defines first turtle

t1=turtle.Turtle()
t1.pensize(2)
t1.speed(3)
t1.penup()
t1.goto(0,100)
t1.color("blue", "blue")
t1.pendown()

#defines second turtle

t2=turtle.Turtle()
t2.pensize(2)
t2.speed(3)
t2.penup()
t2.goto(0,-100)
t2.color("red", "red")
t2.pendown()

#defines outline

ol=turtle.Turtle()
ol.pensize(2)
ol.speed(7)
ol.penup()
ol.goto(450,0)
ol.color("black", "black")
ol.pendown()

ol.left(90)
ol.forward(300)
ol.left(90)
ol.forward(900)
ol.left(90)
ol.forward(600)
ol.left(90)
ol.forward(900)
ol.left(90)
ol.forward(300)
ol.hideturtle()

#defines score

score1=int(2)
score2=int(2)

def motion():
global move, score1, score2
move = True
path1 = []
path2 = []

#prints score


print("Player 1's score is", str(score1)+"!")
print("Player 2's score is", str(score2)+"!")

#defines motion

while move == True:
global pos1x, pos2x

t1.forward(1)
t2.forward(1)

pos1x = int(t1.xcor())
pos1y = int(t1.ycor())
t1xy = (pos1x, pos1y)

pos2x=int(t2.xcor())
pos2y=int(t2.ycor())
t2xy=(pos2x,pos2y)


path1.append(t1xy)
path2.append(t2xy)

#calculates score1

if t1xy in path2:
score1=int(score1-1)
print("")
print("Player 1's score is", str(score1)+"!")
print("Player 2's score is", str(score2)+"!")
t1.clear()
path1 = []
t2.clear()
path2 = []
t1.penup()
t1.goto(0,100)
t1.pendown()
t2.penup()
t2.goto(0,-100)
t2.pendown()
move = False



if score1==0:
print("Player 2 wins!")
exit()
else:
move==True



#calculates score2


if t2xy in path1:
score2=int(score2-1)
print("")
print("Player 1's score is", str(score1)+"!")
print("Player 2's score is", str(score2)+"!")
t2.clear()
path2 = []
t1.clear()
path1 = []
t2.penup()
t2.goto(0,-100)
t2.pendown()
t1.penup()
t1.goto(0,100)
t1.pendown()
move = False

if score2==0:
print("Player 1 wins!")
exit()
else:
move==True


#borders

if pos1x > 450:
t1.left(135)

if pos2x > 450:
t2.left(135)


if pos1x < -450:
t1.left(135)

if pos2x < -450:
t2.left(135)


if pos1y > 300:
t1.left(135)

if pos2y > 300:
t2.left(135)

if pos1y < -300:
t1.left(135)

if pos2y < -300:
t2.left(135)

#defines controls

def left():
t1.speed(500)
t1.left(45)
t1.speed(3)

def right():
t1.speed(500)
t1.right(45)
t1.speed(3)

def backwards():
t1.left(180)

def stop():
global move
move = False
t1.forward(0)
t2.forward(0)


def left2():
t2.speed(500)
t2.left(45)
t2.speed(3)

def right2():
t2.speed(500)
t2.right(45)
t2.speed(3)

def backwards2():
t2.left(180)

def motion2():

move = True
path1 = []
path2 = []


#onkeys

wn.onkey(left2, "Left")
wn.onkey(right2, "Right")
wn.onkey(backwards2, "Down")

wn.onkey(left, "a")
wn.onkey(right, "d")
wn.onkey(backwards, "s")

wn.onkey(motion, "t")
wn.onkey(stop, "y")
wn.onkey(motion2, "p")



wn.listen()
wn.mainloop()

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