Why does the code below is more effective on level 3 than levels 2 or 1? [closed]

Does someone know why level 3 is more effective than 2 or 1? Even though level 3 runs on the entire length of 'possibilities' it got calculated faster than levels 2 and 1.

temp_possibilities = possibilities.copy()
    index = 0
    if level == 3:
        for possibility in possibilities:
            if check_choice(computer_guesses[rounds - 2], possibility) != round_hits:
                temp_possibilities.remove(possibility)
    elif level == 2:
        length = len(possibilities)
        while index < length:
            possibility = possibilities[index]
            if check_choice(computer_guesses[rounds - 2], possibility) != round_hits:
                temp_possibilities.remove(possibility)
            index += 2
    else:  # level 1
        length = len(possibilities)
        while index < length:
            possibility = possibilities[index]
            if check_choice(computer_guesses[rounds - 2], possibility) != round_hits:
                temp_possibilities.remove(possibility)
            index += 3

source https://stackoverflow.com/questions/73085058/why-does-the-code-below-is-more-effective-on-level-3-than-levels-2-or-1

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