what kind of question is this? do the math, provide some figures if you want anyone to take you seriously. from what i can see the difference would be minimal, probably not even noticeable.
are you seriously going to pretend you've somehow managed to take multiple readings of the time the sun took to cross an area you couldn't mark out in the sky? that beggars belief.
the sun could well be faster at noon. it wouldn't be much, you've just assumed it isn't. you haven't done any thought for yourself, you've just assumed it's not the case, prayed for your round earth fantasy, and offered nothing of any merit. why should people bother answering your clearly pointless question? you've already made up your minds. you can't even know whether what you're saying is true.
you can't mark out a distance in the sky. you can't look directly at the sun. you haven't time its movement at different times. you can't mark the exact same starting time each day due to how day length changes (due to the location of the sun in the aetheric whirlpool). everything you've said is based on the notion that the earth is round, with no facts or figures to justify what you're saying, and somehow it's our problem?
you really are fools.
please, go ahead. manage to find a way to mark the same starting time respective to the sun's movement that day. manage to mark a distance for it to cross in a day, and stare upwards timing it until it reaches that point.
saying that something proves the earth isn't flat when you haven't even shown that something is true is absurd.
think for yourself.