In Age A you have 1-4 actions to use to take cards from the card row only. Your options are extremely limited. If you are the first player you literally only have 5 cards to choose from. If you're not the first player, you can take a look at the Leaders/Wonders summary page before your turn (and that's all that you should need to look at during a mixed game, as all of the other cards are always the same).
In Age IV you will often have 7+ civil actions and 4+ military actions on top of a political action. Your (and your opponents') game board situations will be significantly built up, and you will have some (incomplete) knowledge about end-game scoring through what's in the events decks. There's more to do and a lot to think about in terms of how to optimise your final score. Not to mention you may have to dip into that reserve twice if you are later in turn order and get two turns in Age IV.
So yes, I do think more time is needed in Age IV than in Age A. Regardless, my point stands that if you are feeling rushed by the timer in Super Blitz (or any speed setting for that matter), there are other options available which offer more time. Why are you so determined to play in Super Blitz when it clearly does not suit your level of experience with the game?