Making python blackjack code more efficent

I wrote a piece of blackjack code - for dealer dealing cards to himself (python). My question is how can I make it more efficient, faster and neater. I ran it for 1.000.000 iterations and it took 14.7 second which is quite slow, I believe.

import random
deck = 4 * [2,3,4,5,6,7,8,9,10,10,10,10,11]
random.shuffle(deck)


dealer_hand = []
dealer_hand.append(deck.pop(0))
dealer_hand.append(deck.pop(0))
hit_on_soft_17 = True
exit = False

while not exit:
    if sum(dealer_hand) == 17 and hit_on_soft_17:
        exit = True
        for i, card in enumerate(dealer_hand):
            if card == 11:
                exit = False
                dealer_hand.append(deck.pop(0))
                break
    if sum(dealer_hand) < 17:
        exit = False
        dealer_hand.append(deck.pop(0))
    if sum(dealer_hand) > 21: 
        exit = True
        for i, card in enumerate(dealer_hand):
            if card == 11:
                exit = False
                dealer_hand[i] = 1
                break
    if sum(dealer_hand) < 22 and sum(dealer_hand) > 17:
        exit = True

print(dealer_hand)

I've made a few changes. First, dealing from the end of the array instead of the beginning is faster, so I've changed all pop statements accordingly. I've also neatened up the check for a soft 17, removed redundant exit = False statements, and replaced ifs with elifs.

import random
deck = 4 * [2,3,4,5,6,7,8,9,10,10,10,10,11]
random.shuffle(deck)


dealer_hand = []
dealer_hand.append(deck.pop())
dealer_hand.append(deck.pop())
hit_on_soft_17 = True
exit = False

while not exit:
    if sum(dealer_hand) == 17 and hit_on_soft_17:
        if 11 in dealer_hand:
            dealer_hand.append(deck.pop())
        else:
            exit = True
    elif sum(dealer_hand) < 17:
        dealer_hand.append(deck.pop())
    elif sum(dealer_hand) > 21: 
        for i, card in enumerate(dealer_hand):
            if card == 11:
                dealer_hand[i] = 1
                break
        else:
            exit = True
    elif sum(dealer_hand) < 22 and sum(dealer_hand) > 17:
        exit = True

print(dealer_hand)